[patch 0/9] [RFC] x86: Merge thread_info_32/64 to thread_info.h

[patch 0/9] [RFC] x86: Merge thread_info_32/64 to thread_info.h

[Christoph Lameter]

The following patchset merges the 32 and 64 bit thread_info files into one.

First just move the stuff into a single file and then gradually extract common
code. Ends up with pretty small differences. Had some time last Saturday to
play with it. Feedback/takeover appreciated.

Patch against git tree of today.

-- 

[patch 1/9] x86: merge thread_info.h

[Christoph Lameter]

[-- Attachment #1: njoin --]
[-- Type: text/plain, Size: 26518 bytes --]

Simple merge of both thread_info_32.h and thread_info_64.h into thread_info.h.

Comments for #ifndef __ASM_THREAD_INFO_H and #ifdef __KERNEL__
are the same.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info.h    |  366 ++++++++++++++++++++++++++++++++++++++-
 include/asm-x86/thread_info_32.h |  196 --------------------
 include/asm-x86/thread_info_64.h |  186 -------------------
 3 files changed, 364 insertions(+), 384 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:09:56.481140833 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 17:45:25.430780369 -0700
@@ -1,10 +1,372 @@
+/* thread_info.h: low-level thread information
+ *
+ * Copyright (C) 2002  David Howells (dhowells@redhat.com)
+ * - Incorporating suggestions made by Linus Torvalds and Dave Miller
+ */
+
 #ifndef _ASM_X86_THREAD_INFO_H
+#define _ASM_X86_THREAD_INFO_H
+
 #ifdef CONFIG_X86_32
-# include "thread_info_32.h"
+#include <linux/compiler.h>
+#include <asm/page.h>
+
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#endif
+
+/*
+ * low level task data that entry.S needs immediate access to
+ * - this struct should fit entirely inside of one cache line
+ * - this struct shares the supervisor stack pages
+ * - if the contents of this structure are changed,
+ *   the assembly constants must also be changed
+ */
+#ifndef __ASSEMBLY__
+
+struct thread_info {
+	struct task_struct	*task;		/* main task structure */
+	struct exec_domain	*exec_domain;	/* execution domain */
+	unsigned long		flags;		/* low level flags */
+	unsigned long		status;		/* thread-synchronous flags */
+	__u32			cpu;		/* current CPU */
+	int			preempt_count;	/* 0 => preemptable,
+						   <0 => BUG */
+	mm_segment_t		addr_limit;	/* thread address space:
+						   0-0xBFFFFFFF user-thread
+						   0-0xFFFFFFFF kernel-thread
+						*/
+	void			*sysenter_return;
+	struct restart_block    restart_block;
+	unsigned long           previous_esp;   /* ESP of the previous stack in
+						   case of nested (IRQ) stacks
+						*/
+	__u8			supervisor_stack[0];
+};
+
+#else /* !__ASSEMBLY__ */
+
+#include <asm/asm-offsets.h>
+
+#endif
+
+#define PREEMPT_ACTIVE		0x10000000
+#ifdef CONFIG_4KSTACKS
+#define THREAD_SIZE            (4096)
 #else
-# include "thread_info_64.h"
+#define THREAD_SIZE		(8192)
 #endif
 
+#define STACK_WARN             (THREAD_SIZE/8)
+/*
+ * macros/functions for gaining access to the thread information structure
+ *
+ * preempt_count needs to be 1 initially, until the scheduler is functional.
+ */
+#ifndef __ASSEMBLY__
+
+#define INIT_THREAD_INFO(tsk)			\
+{						\
+	.task		= &tsk,			\
+	.exec_domain	= &default_exec_domain,	\
+	.flags		= 0,			\
+	.cpu		= 0,			\
+	.preempt_count	= 1,			\
+	.addr_limit	= KERNEL_DS,		\
+	.restart_block = {			\
+		.fn = do_no_restart_syscall,	\
+	},					\
+}
+
+#define init_thread_info	(init_thread_union.thread_info)
+#define init_stack		(init_thread_union.stack)
+
+
+/* how to get the current stack pointer from C */
+register unsigned long current_stack_pointer asm("esp") __used;
+
+/* how to get the thread information struct from C */
+static inline struct thread_info *current_thread_info(void)
+{
+	return (struct thread_info *)
+		(current_stack_pointer & ~(THREAD_SIZE - 1));
+}
+
+/* thread information allocation */
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define alloc_thread_info(tsk) ((struct thread_info *)			\
+	__get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(THREAD_SIZE)))
+#else
+#define alloc_thread_info(tsk) ((struct thread_info *)			\
+	__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)))
+#endif
+
+#else /* !__ASSEMBLY__ */
+
+/* how to get the thread information struct from ASM */
+#define GET_THREAD_INFO(reg)	 \
+	movl $-THREAD_SIZE, reg; \
+	andl %esp, reg
+
+/* use this one if reg already contains %esp */
+#define GET_THREAD_INFO_WITH_ESP(reg) \
+	andl $-THREAD_SIZE, reg
+
+#endif
+
+/*
+ * thread information flags
+ * - these are process state flags that various
+ *   assembly files may need to access
+ * - pending work-to-be-done flags are in LSW
+ * - other flags in MSW
+ */
+#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_SIGPENDING		1	/* signal pending */
+#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
+#define TIF_SINGLESTEP		3	/* restore singlestep on return to
+					   user mode */
+#define TIF_IRET		4	/* return with iret */
+#define TIF_SYSCALL_EMU		5	/* syscall emulation active */
+#define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */
+#define TIF_SECCOMP		7	/* secure computing */
+#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
+#define TIF_HRTICK_RESCHED	9	/* reprogram hrtick timer */
+#define TIF_MEMDIE		16
+#define TIF_DEBUG		17	/* uses debug registers */
+#define TIF_IO_BITMAP		18	/* uses I/O bitmap */
+#define TIF_FREEZE		19	/* is freezing for suspend */
+#define TIF_NOTSC		20	/* TSC is not accessible in userland */
+#define TIF_FORCED_TF		21	/* true if TF in eflags artificially */
+#define TIF_DEBUGCTLMSR		22	/* uses thread_struct.debugctlmsr */
+#define TIF_DS_AREA_MSR 	23      /* uses thread_struct.ds_area_msr */
+#define TIF_BTS_TRACE_TS        24      /* record scheduling event timestamps */
+
+#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
+#define _TIF_IRET		(1 << TIF_IRET)
+#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
+#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
+#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
+#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+#define _TIF_HRTICK_RESCHED	(1 << TIF_HRTICK_RESCHED)
+#define _TIF_DEBUG		(1 << TIF_DEBUG)
+#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
+#define _TIF_FREEZE		(1 << TIF_FREEZE)
+#define _TIF_NOTSC		(1 << TIF_NOTSC)
+#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
+#define _TIF_DEBUGCTLMSR	(1 << TIF_DEBUGCTLMSR)
+#define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
+#define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)
+
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK							\
+	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT |	\
+			_TIF_SECCOMP | _TIF_SYSCALL_EMU))
+/* work to do on any return to u-space */
+#define _TIF_ALLWORK_MASK	(0x0000FFFF & ~_TIF_SECCOMP)
+
+/* flags to check in __switch_to() */
+#define _TIF_WORK_CTXSW						\
+	(_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUGCTLMSR |	\
+	 _TIF_DS_AREA_MSR | _TIF_BTS_TRACE_TS)
+#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
+#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW | _TIF_DEBUG)
+
+
+/*
+ * Thread-synchronous status.
+ *
+ * This is different from the flags in that nobody else
+ * ever touches our thread-synchronous status, so we don't
+ * have to worry about atomic accesses.
+ */
+#define TS_USEDFPU		0x0001	/* FPU was used by this task
+					   this quantum (SMP) */
+#define TS_POLLING		0x0002	/* True if in idle loop
+					   and not sleeping */
+
+#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
+
+#else /* X86_32 */
+
+#include <asm/page.h>
+#include <asm/types.h>
+#include <asm/pda.h>
+
+/*
+ * low level task data that entry.S needs immediate access to
+ * - this struct should fit entirely inside of one cache line
+ * - this struct shares the supervisor stack pages
+ */
+#ifndef __ASSEMBLY__
+struct task_struct;
+struct exec_domain;
+#include <asm/processor.h>
+
+struct thread_info {
+	struct task_struct	*task;		/* main task structure */
+	struct exec_domain	*exec_domain;	/* execution domain */
+	__u32			flags;		/* low level flags */
+	__u32			status;		/* thread synchronous flags */
+	__u32			cpu;		/* current CPU */
+	int 			preempt_count;	/* 0 => preemptable,
+						   <0 => BUG */
+	mm_segment_t		addr_limit;
+	struct restart_block    restart_block;
+#ifdef CONFIG_IA32_EMULATION
+	void __user		*sysenter_return;
+#endif
+};
+#endif
+
+/*
+ * macros/functions for gaining access to the thread information structure
+ * preempt_count needs to be 1 initially, until the scheduler is functional.
+ */
+#ifndef __ASSEMBLY__
+#define INIT_THREAD_INFO(tsk)			\
+{						\
+	.task	       = &tsk,			\
+	.exec_domain   = &default_exec_domain,	\
+	.flags	       = 0,			\
+	.cpu	       = 0,			\
+	.preempt_count = 1,			\
+	.addr_limit     = KERNEL_DS,		\
+	.restart_block = {			\
+		.fn = do_no_restart_syscall,	\
+	},					\
+}
+
+#define init_thread_info	(init_thread_union.thread_info)
+#define init_stack		(init_thread_union.stack)
+
+static inline struct thread_info *current_thread_info(void)
+{
+	struct thread_info *ti;
+	ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
+	return ti;
+}
+
+/* do not use in interrupt context */
+static inline struct thread_info *stack_thread_info(void)
+{
+	struct thread_info *ti;
+	asm("andq %%rsp,%0; " : "=r" (ti) : "0" (~(THREAD_SIZE - 1)));
+	return ti;
+}
+
+/* thread information allocation */
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
+#else
+#define THREAD_FLAGS GFP_KERNEL
+#endif
+
+#define alloc_thread_info(tsk)						\
+	((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
+
+#else /* !__ASSEMBLY__ */
+
+/* how to get the thread information struct from ASM */
+#define GET_THREAD_INFO(reg) \
+	movq %gs:pda_kernelstack,reg ; \
+	subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
+
+#endif
+
+/*
+ * thread information flags
+ * - these are process state flags that various assembly files
+ *   may need to access
+ * - pending work-to-be-done flags are in LSW
+ * - other flags in MSW
+ * Warning: layout of LSW is hardcoded in entry.S
+ */
+#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_SIGPENDING		2	/* signal pending */
+#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
+#define TIF_SINGLESTEP		4	/* reenable singlestep on user return*/
+#define TIF_IRET		5	/* force IRET */
+#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
+#define TIF_SECCOMP		8	/* secure computing */
+#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */
+#define TIF_MCE_NOTIFY		10	/* notify userspace of an MCE */
+#define TIF_HRTICK_RESCHED	11	/* reprogram hrtick timer */
+/* 16 free */
+#define TIF_IA32		17	/* 32bit process */
+#define TIF_FORK		18	/* ret_from_fork */
+#define TIF_ABI_PENDING		19
+#define TIF_MEMDIE		20
+#define TIF_DEBUG		21	/* uses debug registers */
+#define TIF_IO_BITMAP		22	/* uses I/O bitmap */
+#define TIF_FREEZE		23	/* is freezing for suspend */
+#define TIF_FORCED_TF		24	/* true if TF in eflags artificially */
+#define TIF_DEBUGCTLMSR		25	/* uses thread_struct.debugctlmsr */
+#define TIF_DS_AREA_MSR		26      /* uses thread_struct.ds_area_msr */
+#define TIF_BTS_TRACE_TS	27      /* record scheduling event timestamps */
+#define TIF_NOTSC		28	/* TSC is not accessible in userland */
+
+#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
+#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
+#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+#define _TIF_IRET		(1 << TIF_IRET)
+#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
+#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
+#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+#define _TIF_MCE_NOTIFY		(1 << TIF_MCE_NOTIFY)
+#define _TIF_HRTICK_RESCHED	(1 << TIF_HRTICK_RESCHED)
+#define _TIF_IA32		(1 << TIF_IA32)
+#define _TIF_FORK		(1 << TIF_FORK)
+#define _TIF_ABI_PENDING	(1 << TIF_ABI_PENDING)
+#define _TIF_DEBUG		(1 << TIF_DEBUG)
+#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
+#define _TIF_FREEZE		(1 << TIF_FREEZE)
+#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
+#define _TIF_DEBUGCTLMSR	(1 << TIF_DEBUGCTLMSR)
+#define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
+#define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)
+#define _TIF_NOTSC		(1 << TIF_NOTSC)
+
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK							\
+	(0x0000FFFF &							\
+	 ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
+/* work to do on any return to user space */
+#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
+
+#define _TIF_DO_NOTIFY_MASK						\
+	(_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)
+
+/* flags to check in __switch_to() */
+#define _TIF_WORK_CTXSW							\
+	(_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS|_TIF_NOTSC)
+#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
+#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
+
+#define PREEMPT_ACTIVE     0x10000000
+
+/*
+ * Thread-synchronous status.
+ *
+ * This is different from the flags in that nobody else
+ * ever touches our thread-synchronous status, so we don't
+ * have to worry about atomic accesses.
+ */
+#define TS_USEDFPU		0x0001	/* FPU was used by this task
+					   this quantum (SMP) */
+#define TS_COMPAT		0x0002	/* 32bit syscall active */
+#define TS_POLLING		0x0004	/* true if in idle loop
+					   and not sleeping */
+
+#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
+
+#endif /* !X86_32 */
+
+
 #ifndef __ASSEMBLY__
 extern void arch_task_cache_init(void);
 extern void free_thread_info(struct thread_info *ti);
Index: linux-2.6/include/asm-x86/thread_info_32.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info_32.h	2008-04-28 17:15:27.669896749 -0700
+++ /dev/null	1970-01-01 00:00:00.000000000 +0000
@@ -1,196 +0,0 @@
-/* thread_info.h: i386 low-level thread information
- *
- * Copyright (C) 2002  David Howells (dhowells@redhat.com)
- * - Incorporating suggestions made by Linus Torvalds and Dave Miller
- */
-
-#ifndef _ASM_THREAD_INFO_H
-#define _ASM_THREAD_INFO_H
-
-#ifdef __KERNEL__
-
-#include <linux/compiler.h>
-#include <asm/page.h>
-
-#ifndef __ASSEMBLY__
-#include <asm/processor.h>
-#endif
-
-/*
- * low level task data that entry.S needs immediate access to
- * - this struct should fit entirely inside of one cache line
- * - this struct shares the supervisor stack pages
- * - if the contents of this structure are changed,
- *   the assembly constants must also be changed
- */
-#ifndef __ASSEMBLY__
-
-struct thread_info {
-	struct task_struct	*task;		/* main task structure */
-	struct exec_domain	*exec_domain;	/* execution domain */
-	unsigned long		flags;		/* low level flags */
-	unsigned long		status;		/* thread-synchronous flags */
-	__u32			cpu;		/* current CPU */
-	int			preempt_count;	/* 0 => preemptable,
-						   <0 => BUG */
-	mm_segment_t		addr_limit;	/* thread address space:
-						   0-0xBFFFFFFF user-thread
-						   0-0xFFFFFFFF kernel-thread
-						*/
-	void			*sysenter_return;
-	struct restart_block    restart_block;
-	unsigned long           previous_esp;   /* ESP of the previous stack in
-						   case of nested (IRQ) stacks
-						*/
-	__u8			supervisor_stack[0];
-};
-
-#else /* !__ASSEMBLY__ */
-
-#include <asm/asm-offsets.h>
-
-#endif
-
-#define PREEMPT_ACTIVE		0x10000000
-#ifdef CONFIG_4KSTACKS
-#define THREAD_SIZE            (4096)
-#else
-#define THREAD_SIZE		(8192)
-#endif
-
-#define STACK_WARN             (THREAD_SIZE/8)
-/*
- * macros/functions for gaining access to the thread information structure
- *
- * preempt_count needs to be 1 initially, until the scheduler is functional.
- */
-#ifndef __ASSEMBLY__
-
-#define INIT_THREAD_INFO(tsk)			\
-{						\
-	.task		= &tsk,			\
-	.exec_domain	= &default_exec_domain,	\
-	.flags		= 0,			\
-	.cpu		= 0,			\
-	.preempt_count	= 1,			\
-	.addr_limit	= KERNEL_DS,		\
-	.restart_block = {			\
-		.fn = do_no_restart_syscall,	\
-	},					\
-}
-
-#define init_thread_info	(init_thread_union.thread_info)
-#define init_stack		(init_thread_union.stack)
-
-
-/* how to get the current stack pointer from C */
-register unsigned long current_stack_pointer asm("esp") __used;
-
-/* how to get the thread information struct from C */
-static inline struct thread_info *current_thread_info(void)
-{
-	return (struct thread_info *)
-		(current_stack_pointer & ~(THREAD_SIZE - 1));
-}
-
-/* thread information allocation */
-#ifdef CONFIG_DEBUG_STACK_USAGE
-#define alloc_thread_info(tsk) ((struct thread_info *)			\
-	__get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(THREAD_SIZE)))
-#else
-#define alloc_thread_info(tsk) ((struct thread_info *)			\
-	__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)))
-#endif
-
-#else /* !__ASSEMBLY__ */
-
-/* how to get the thread information struct from ASM */
-#define GET_THREAD_INFO(reg)	 \
-	movl $-THREAD_SIZE, reg; \
-	andl %esp, reg
-
-/* use this one if reg already contains %esp */
-#define GET_THREAD_INFO_WITH_ESP(reg) \
-	andl $-THREAD_SIZE, reg
-
-#endif
-
-/*
- * thread information flags
- * - these are process state flags that various
- *   assembly files may need to access
- * - pending work-to-be-done flags are in LSW
- * - other flags in MSW
- */
-#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
-#define TIF_SIGPENDING		1	/* signal pending */
-#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
-#define TIF_SINGLESTEP		3	/* restore singlestep on return to
-					   user mode */
-#define TIF_IRET		4	/* return with iret */
-#define TIF_SYSCALL_EMU		5	/* syscall emulation active */
-#define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */
-#define TIF_SECCOMP		7	/* secure computing */
-#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
-#define TIF_HRTICK_RESCHED	9	/* reprogram hrtick timer */
-#define TIF_MEMDIE		16
-#define TIF_DEBUG		17	/* uses debug registers */
-#define TIF_IO_BITMAP		18	/* uses I/O bitmap */
-#define TIF_FREEZE		19	/* is freezing for suspend */
-#define TIF_NOTSC		20	/* TSC is not accessible in userland */
-#define TIF_FORCED_TF		21	/* true if TF in eflags artificially */
-#define TIF_DEBUGCTLMSR		22	/* uses thread_struct.debugctlmsr */
-#define TIF_DS_AREA_MSR 	23      /* uses thread_struct.ds_area_msr */
-#define TIF_BTS_TRACE_TS        24      /* record scheduling event timestamps */
-
-#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
-#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
-#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
-#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_IRET		(1 << TIF_IRET)
-#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
-#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
-#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
-#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
-#define _TIF_HRTICK_RESCHED	(1 << TIF_HRTICK_RESCHED)
-#define _TIF_DEBUG		(1 << TIF_DEBUG)
-#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
-#define _TIF_FREEZE		(1 << TIF_FREEZE)
-#define _TIF_NOTSC		(1 << TIF_NOTSC)
-#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
-#define _TIF_DEBUGCTLMSR	(1 << TIF_DEBUGCTLMSR)
-#define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
-#define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)
-
-/* work to do on interrupt/exception return */
-#define _TIF_WORK_MASK							\
-	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT |	\
-			_TIF_SECCOMP | _TIF_SYSCALL_EMU))
-/* work to do on any return to u-space */
-#define _TIF_ALLWORK_MASK	(0x0000FFFF & ~_TIF_SECCOMP)
-
-/* flags to check in __switch_to() */
-#define _TIF_WORK_CTXSW						\
-	(_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUGCTLMSR |	\
-	 _TIF_DS_AREA_MSR | _TIF_BTS_TRACE_TS)
-#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
-#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW | _TIF_DEBUG)
-
-
-/*
- * Thread-synchronous status.
- *
- * This is different from the flags in that nobody else
- * ever touches our thread-synchronous status, so we don't
- * have to worry about atomic accesses.
- */
-#define TS_USEDFPU		0x0001	/* FPU was used by this task
-					   this quantum (SMP) */
-#define TS_POLLING		0x0002	/* True if in idle loop
-					   and not sleeping */
-
-#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
-
-#endif /* __KERNEL__ */
-
-#endif /* _ASM_THREAD_INFO_H */
Index: linux-2.6/include/asm-x86/thread_info_64.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info_64.h	2008-04-28 17:15:27.689889454 -0700
+++ /dev/null	1970-01-01 00:00:00.000000000 +0000
@@ -1,186 +0,0 @@
-/* thread_info.h: x86_64 low-level thread information
- *
- * Copyright (C) 2002  David Howells (dhowells@redhat.com)
- * - Incorporating suggestions made by Linus Torvalds and Dave Miller
- */
-
-#ifndef _ASM_THREAD_INFO_H
-#define _ASM_THREAD_INFO_H
-
-#ifdef __KERNEL__
-
-#include <asm/page.h>
-#include <asm/types.h>
-#include <asm/pda.h>
-
-/*
- * low level task data that entry.S needs immediate access to
- * - this struct should fit entirely inside of one cache line
- * - this struct shares the supervisor stack pages
- */
-#ifndef __ASSEMBLY__
-struct task_struct;
-struct exec_domain;
-#include <asm/processor.h>
-
-struct thread_info {
-	struct task_struct	*task;		/* main task structure */
-	struct exec_domain	*exec_domain;	/* execution domain */
-	__u32			flags;		/* low level flags */
-	__u32			status;		/* thread synchronous flags */
-	__u32			cpu;		/* current CPU */
-	int 			preempt_count;	/* 0 => preemptable,
-						   <0 => BUG */
-	mm_segment_t		addr_limit;
-	struct restart_block    restart_block;
-#ifdef CONFIG_IA32_EMULATION
-	void __user		*sysenter_return;
-#endif
-};
-#endif
-
-/*
- * macros/functions for gaining access to the thread information structure
- * preempt_count needs to be 1 initially, until the scheduler is functional.
- */
-#ifndef __ASSEMBLY__
-#define INIT_THREAD_INFO(tsk)			\
-{						\
-	.task	       = &tsk,			\
-	.exec_domain   = &default_exec_domain,	\
-	.flags	       = 0,			\
-	.cpu	       = 0,			\
-	.preempt_count = 1,			\
-	.addr_limit     = KERNEL_DS,		\
-	.restart_block = {			\
-		.fn = do_no_restart_syscall,	\
-	},					\
-}
-
-#define init_thread_info	(init_thread_union.thread_info)
-#define init_stack		(init_thread_union.stack)
-
-static inline struct thread_info *current_thread_info(void)
-{
-	struct thread_info *ti;
-	ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
-	return ti;
-}
-
-/* do not use in interrupt context */
-static inline struct thread_info *stack_thread_info(void)
-{
-	struct thread_info *ti;
-	asm("andq %%rsp,%0; " : "=r" (ti) : "0" (~(THREAD_SIZE - 1)));
-	return ti;
-}
-
-/* thread information allocation */
-#ifdef CONFIG_DEBUG_STACK_USAGE
-#define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
-#else
-#define THREAD_FLAGS GFP_KERNEL
-#endif
-
-#define alloc_thread_info(tsk)						\
-	((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
-
-#else /* !__ASSEMBLY__ */
-
-/* how to get the thread information struct from ASM */
-#define GET_THREAD_INFO(reg) \
-	movq %gs:pda_kernelstack,reg ; \
-	subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
-
-#endif
-
-/*
- * thread information flags
- * - these are process state flags that various assembly files
- *   may need to access
- * - pending work-to-be-done flags are in LSW
- * - other flags in MSW
- * Warning: layout of LSW is hardcoded in entry.S
- */
-#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
-#define TIF_SIGPENDING		2	/* signal pending */
-#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
-#define TIF_SINGLESTEP		4	/* reenable singlestep on user return*/
-#define TIF_IRET		5	/* force IRET */
-#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
-#define TIF_SECCOMP		8	/* secure computing */
-#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */
-#define TIF_MCE_NOTIFY		10	/* notify userspace of an MCE */
-#define TIF_HRTICK_RESCHED	11	/* reprogram hrtick timer */
-/* 16 free */
-#define TIF_IA32		17	/* 32bit process */
-#define TIF_FORK		18	/* ret_from_fork */
-#define TIF_ABI_PENDING		19
-#define TIF_MEMDIE		20
-#define TIF_DEBUG		21	/* uses debug registers */
-#define TIF_IO_BITMAP		22	/* uses I/O bitmap */
-#define TIF_FREEZE		23	/* is freezing for suspend */
-#define TIF_FORCED_TF		24	/* true if TF in eflags artificially */
-#define TIF_DEBUGCTLMSR		25	/* uses thread_struct.debugctlmsr */
-#define TIF_DS_AREA_MSR		26      /* uses thread_struct.ds_area_msr */
-#define TIF_BTS_TRACE_TS	27      /* record scheduling event timestamps */
-#define TIF_NOTSC		28	/* TSC is not accessible in userland */
-
-#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
-#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
-#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
-#define _TIF_IRET		(1 << TIF_IRET)
-#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
-#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
-#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
-#define _TIF_MCE_NOTIFY		(1 << TIF_MCE_NOTIFY)
-#define _TIF_HRTICK_RESCHED	(1 << TIF_HRTICK_RESCHED)
-#define _TIF_IA32		(1 << TIF_IA32)
-#define _TIF_FORK		(1 << TIF_FORK)
-#define _TIF_ABI_PENDING	(1 << TIF_ABI_PENDING)
-#define _TIF_DEBUG		(1 << TIF_DEBUG)
-#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
-#define _TIF_FREEZE		(1 << TIF_FREEZE)
-#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
-#define _TIF_DEBUGCTLMSR	(1 << TIF_DEBUGCTLMSR)
-#define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
-#define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)
-#define _TIF_NOTSC		(1 << TIF_NOTSC)
-
-/* work to do on interrupt/exception return */
-#define _TIF_WORK_MASK							\
-	(0x0000FFFF &							\
-	 ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
-/* work to do on any return to user space */
-#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
-
-#define _TIF_DO_NOTIFY_MASK						\
-	(_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)
-
-/* flags to check in __switch_to() */
-#define _TIF_WORK_CTXSW							\
-	(_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS|_TIF_NOTSC)
-#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
-#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
-
-#define PREEMPT_ACTIVE     0x10000000
-
-/*
- * Thread-synchronous status.
- *
- * This is different from the flags in that nobody else
- * ever touches our thread-synchronous status, so we don't
- * have to worry about atomic accesses.
- */
-#define TS_USEDFPU		0x0001	/* FPU was used by this task
-					   this quantum (SMP) */
-#define TS_COMPAT		0x0002	/* 32bit syscall active */
-#define TS_POLLING		0x0004	/* true if in idle loop
-					   and not sleeping */
-
-#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
-
-#endif /* __KERNEL__ */
-
-#endif /* _ASM_THREAD_INFO_H */

-- 

[patch 2/9] x86: threadinfo: Common include files

[Christoph Lameter]

[-- Attachment #1: merge_includes --]
[-- Type: text/plain, Size: 1048 bytes --]

Move shared includes to a common area in thread_info.h

Adds asm/types.h for x86_64 and linux/compiler.h for x86_32. Not needed but
we can avoid some ifdeffing and it simplifies later joining.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:18:24.182686168 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 17:19:43.520434319 -0700
@@ -7,9 +7,11 @@
 #ifndef _ASM_X86_THREAD_INFO_H
 #define _ASM_X86_THREAD_INFO_H
 
-#ifdef CONFIG_X86_32
 #include <linux/compiler.h>
 #include <asm/page.h>
+#include <asm/types.h>
+
+#ifdef CONFIG_X86_32
 
 #ifndef __ASSEMBLY__
 #include <asm/processor.h>
@@ -192,8 +194,6 @@ static inline struct thread_info *curren
 
 #else /* X86_32 */
 
-#include <asm/page.h>
-#include <asm/types.h>
 #include <asm/pda.h>
 
 /*

-- 

[patch 3/9] x86: threadinfo: Merge thread sync state definitions

[Christoph Lameter]

[-- Attachment #1: merge_threadinfo --]
[-- Type: text/plain, Size: 1930 bytes --]

Merge both. x86_64 has an additional TS_COMPAT that is harmless
for 32 bit.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info.h |   22 +++-------------------
 1 file changed, 3 insertions(+), 19 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:45:31.632388749 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 17:47:10.563649517 -0700
@@ -177,21 +177,6 @@ static inline struct thread_info *curren
 #define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW | _TIF_DEBUG)
 
-
-/*
- * Thread-synchronous status.
- *
- * This is different from the flags in that nobody else
- * ever touches our thread-synchronous status, so we don't
- * have to worry about atomic accesses.
- */
-#define TS_USEDFPU		0x0001	/* FPU was used by this task
-					   this quantum (SMP) */
-#define TS_POLLING		0x0002	/* True if in idle loop
-					   and not sleeping */
-
-#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
-
 #else /* X86_32 */
 
 #include <asm/pda.h>
@@ -349,6 +334,8 @@ static inline struct thread_info *stack_
 
 #define PREEMPT_ACTIVE     0x10000000
 
+#endif /* !X86_32 */
+
 /*
  * Thread-synchronous status.
  *
@@ -358,15 +345,12 @@ static inline struct thread_info *stack_
  */
 #define TS_USEDFPU		0x0001	/* FPU was used by this task
 					   this quantum (SMP) */
-#define TS_COMPAT		0x0002	/* 32bit syscall active */
+#define TS_COMPAT		0x0002	/* 32bit syscall active (64BIT)*/
 #define TS_POLLING		0x0004	/* true if in idle loop
 					   and not sleeping */
 
 #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
 
-#endif /* !X86_32 */
-
-
 #ifndef __ASSEMBLY__
 extern void arch_task_cache_init(void);
 extern void free_thread_info(struct thread_info *ti);

-- 

[patch 4/9] x86: common thread_info definitions

[Christoph Lameter]

[-- Attachment #1: merge_threadinfo2 --]
[-- Type: text/plain, Size: 3402 bytes --]

Merge the thread_info definition into one structure definition for both arches.

The __u32 is equal to unsigned long for 32 bit.

sysenter_return is used both for the IA32 emulation for 64 and x86_32.
Avoid complicated #ifdef by simply always including it.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info.h |   55 +++++++++---------------------------------
 1 file changed, 12 insertions(+), 43 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:47:10.563649517 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 17:47:14.822390659 -0700
@@ -11,47 +11,42 @@
 #include <asm/page.h>
 #include <asm/types.h>
 
-#ifdef CONFIG_X86_32
-
-#ifndef __ASSEMBLY__
-#include <asm/processor.h>
-#endif
-
 /*
  * low level task data that entry.S needs immediate access to
  * - this struct should fit entirely inside of one cache line
  * - this struct shares the supervisor stack pages
- * - if the contents of this structure are changed,
- *   the assembly constants must also be changed
  */
 #ifndef __ASSEMBLY__
+struct task_struct;
+struct exec_domain;
+#include <asm/processor.h>
 
 struct thread_info {
 	struct task_struct	*task;		/* main task structure */
 	struct exec_domain	*exec_domain;	/* execution domain */
-	unsigned long		flags;		/* low level flags */
-	unsigned long		status;		/* thread-synchronous flags */
+	__u32			flags;		/* low level flags */
+	__u32			status;		/* thread synchronous flags */
 	__u32			cpu;		/* current CPU */
-	int			preempt_count;	/* 0 => preemptable,
+	int 			preempt_count;	/* 0 => preemptable,
 						   <0 => BUG */
-	mm_segment_t		addr_limit;	/* thread address space:
-						   0-0xBFFFFFFF user-thread
-						   0-0xFFFFFFFF kernel-thread
-						*/
-	void			*sysenter_return;
+	mm_segment_t		addr_limit;
 	struct restart_block    restart_block;
+	void __user		*sysenter_return;
+#ifdef CONFIG_X86_32
 	unsigned long           previous_esp;   /* ESP of the previous stack in
 						   case of nested (IRQ) stacks
 						*/
 	__u8			supervisor_stack[0];
+#endif
 };
-
 #else /* !__ASSEMBLY__ */
 
 #include <asm/asm-offsets.h>
 
 #endif
 
+#ifdef CONFIG_X86_32
+
 #define PREEMPT_ACTIVE		0x10000000
 #ifdef CONFIG_4KSTACKS
 #define THREAD_SIZE            (4096)
@@ -182,32 +177,6 @@ static inline struct thread_info *curren
 #include <asm/pda.h>
 
 /*
- * low level task data that entry.S needs immediate access to
- * - this struct should fit entirely inside of one cache line
- * - this struct shares the supervisor stack pages
- */
-#ifndef __ASSEMBLY__
-struct task_struct;
-struct exec_domain;
-#include <asm/processor.h>
-
-struct thread_info {
-	struct task_struct	*task;		/* main task structure */
-	struct exec_domain	*exec_domain;	/* execution domain */
-	__u32			flags;		/* low level flags */
-	__u32			status;		/* thread synchronous flags */
-	__u32			cpu;		/* current CPU */
-	int 			preempt_count;	/* 0 => preemptable,
-						   <0 => BUG */
-	mm_segment_t		addr_limit;
-	struct restart_block    restart_block;
-#ifdef CONFIG_IA32_EMULATION
-	void __user		*sysenter_return;
-#endif
-};
-#endif
-
-/*
  * macros/functions for gaining access to the thread information structure
  * preempt_count needs to be 1 initially, until the scheduler is functional.
  */

-- 

[patch 5/9] x86: threadinfo: Merge INIT_THREAD_INFO

[Christoph Lameter]

[-- Attachment #1: init_thread_info --]
[-- Type: text/plain, Size: 2289 bytes --]

Both definitions are the same. So move to common x86 area.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info.h |   49 ++++++++++++++----------------------------
 1 file changed, 17 insertions(+), 32 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:47:14.822390659 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 17:48:36.029891123 -0700
@@ -39,6 +39,23 @@ struct thread_info {
 	__u8			supervisor_stack[0];
 #endif
 };
+
+#define INIT_THREAD_INFO(tsk)			\
+{						\
+	.task		= &tsk,			\
+	.exec_domain	= &default_exec_domain,	\
+	.flags		= 0,			\
+	.cpu		= 0,			\
+	.preempt_count	= 1,			\
+	.addr_limit	= KERNEL_DS,		\
+	.restart_block = {			\
+		.fn = do_no_restart_syscall,	\
+	},					\
+}
+
+#define init_thread_info	(init_thread_union.thread_info)
+#define init_stack		(init_thread_union.stack)
+
 #else /* !__ASSEMBLY__ */
 
 #include <asm/asm-offsets.h>
@@ -62,22 +79,6 @@ struct thread_info {
  */
 #ifndef __ASSEMBLY__
 
-#define INIT_THREAD_INFO(tsk)			\
-{						\
-	.task		= &tsk,			\
-	.exec_domain	= &default_exec_domain,	\
-	.flags		= 0,			\
-	.cpu		= 0,			\
-	.preempt_count	= 1,			\
-	.addr_limit	= KERNEL_DS,		\
-	.restart_block = {			\
-		.fn = do_no_restart_syscall,	\
-	},					\
-}
-
-#define init_thread_info	(init_thread_union.thread_info)
-#define init_stack		(init_thread_union.stack)
-
 
 /* how to get the current stack pointer from C */
 register unsigned long current_stack_pointer asm("esp") __used;
@@ -181,22 +182,6 @@ static inline struct thread_info *curren
  * preempt_count needs to be 1 initially, until the scheduler is functional.
  */
 #ifndef __ASSEMBLY__
-#define INIT_THREAD_INFO(tsk)			\
-{						\
-	.task	       = &tsk,			\
-	.exec_domain   = &default_exec_domain,	\
-	.flags	       = 0,			\
-	.cpu	       = 0,			\
-	.preempt_count = 1,			\
-	.addr_limit     = KERNEL_DS,		\
-	.restart_block = {			\
-		.fn = do_no_restart_syscall,	\
-	},					\
-}
-
-#define init_thread_info	(init_thread_union.thread_info)
-#define init_stack		(init_thread_union.stack)
-
 static inline struct thread_info *current_thread_info(void)
 {
 	struct thread_info *ti;

-- 

[patch 6/9] x86: thread_info: PREEMPT_ACTIVE

[Christoph Lameter]

[-- Attachment #1: merge_preempt_active --]
[-- Type: text/plain, Size: 962 bytes --]

Same for both 32 and 64 bit so simply put it in to the common area.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info.h |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:48:36.029891123 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 17:49:29.299897238 -0700
@@ -62,9 +62,10 @@ struct thread_info {
 
 #endif
 
+#define PREEMPT_ACTIVE		0x10000000
+
 #ifdef CONFIG_X86_32
 
-#define PREEMPT_ACTIVE		0x10000000
 #ifdef CONFIG_4KSTACKS
 #define THREAD_SIZE            (4096)
 #else
@@ -286,8 +287,6 @@ static inline struct thread_info *stack_
 #define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
 
-#define PREEMPT_ACTIVE     0x10000000
-
 #endif /* !X86_32 */
 
 /*

-- 

[patch 7/9] x86: thread_info: Merget TIF_ flags.

[Christoph Lameter]

[-- Attachment #1: merge_tif_flags --]
[-- Type: text/plain, Size: 8318 bytes --]

Both TIF lists are essentially the same. x86_32 also has TIF_SYSCALL_EMU which
must be undefined for the 64 bit case.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info.h |  162 +++++++++++++++---------------------------
 1 file changed, 61 insertions(+), 101 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:54:20.149889589 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 17:57:21.724529078 -0700
@@ -62,6 +62,67 @@ struct thread_info {
 
 #endif
 
+/*
+ * thread information flags
+ * - these are process state flags that various assembly files
+ *   may need to access
+ * - pending work-to-be-done flags are in LSW
+ * - other flags in MSW
+ * Warning: layout of LSW is hardcoded in entry.S
+ */
+#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_SIGPENDING		2	/* signal pending */
+#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
+#define TIF_SINGLESTEP		4	/* reenable singlestep on user return*/
+#define TIF_IRET		5	/* force IRET */
+#ifdef CONFIG_X86_32
+#define TIF_SYSCALL_EMU		6	/* syscall emulation active */
+#endif
+#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
+#define TIF_SECCOMP		8	/* secure computing */
+#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */
+#define TIF_MCE_NOTIFY		10	/* notify userspace of an MCE */
+#define TIF_HRTICK_RESCHED	11	/* reprogram hrtick timer */
+#define TIF_NOTSC		16	/* TSC is not accessible in userland */
+#define TIF_IA32		17	/* 32bit process */
+#define TIF_FORK		18	/* ret_from_fork */
+#define TIF_ABI_PENDING		19
+#define TIF_MEMDIE		20
+#define TIF_DEBUG		21	/* uses debug registers */
+#define TIF_IO_BITMAP		22	/* uses I/O bitmap */
+#define TIF_FREEZE		23	/* is freezing for suspend */
+#define TIF_FORCED_TF		24	/* true if TF in eflags artificially */
+#define TIF_DEBUGCTLMSR		25	/* uses thread_struct.debugctlmsr */
+#define TIF_DS_AREA_MSR		26      /* uses thread_struct.ds_area_msr */
+#define TIF_BTS_TRACE_TS	27      /* record scheduling event timestamps */
+
+#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
+#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
+#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+#define _TIF_IRET		(1 << TIF_IRET)
+#ifdef CONFIG_X86_32
+#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
+#else
+#define _TIF_SYSCALL_EMU	0
+#endif
+#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
+#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
+#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+#define _TIF_MCE_NOTIFY		(1 << TIF_MCE_NOTIFY)
+#define _TIF_HRTICK_RESCHED	(1 << TIF_HRTICK_RESCHED)
+#define _TIF_NOTSC		(1 << TIF_NOTSC)
+#define _TIF_IA32		(1 << TIF_IA32)
+#define _TIF_FORK		(1 << TIF_FORK)
+#define _TIF_ABI_PENDING	(1 << TIF_ABI_PENDING)
+#define _TIF_DEBUG		(1 << TIF_DEBUG)
+#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
+#define _TIF_FREEZE		(1 << TIF_FREEZE)
+#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
+#define _TIF_DEBUGCTLMSR	(1 << TIF_DEBUGCTLMSR)
+#define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
+#define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)
+
 #define PREEMPT_ACTIVE		0x10000000
 
 #ifdef CONFIG_X86_32
@@ -113,53 +174,6 @@ static inline struct thread_info *curren
 
 #endif
 
-/*
- * thread information flags
- * - these are process state flags that various
- *   assembly files may need to access
- * - pending work-to-be-done flags are in LSW
- * - other flags in MSW
- */
-#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
-#define TIF_SIGPENDING		1	/* signal pending */
-#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
-#define TIF_SINGLESTEP		3	/* restore singlestep on return to
-					   user mode */
-#define TIF_IRET		4	/* return with iret */
-#define TIF_SYSCALL_EMU		5	/* syscall emulation active */
-#define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */
-#define TIF_SECCOMP		7	/* secure computing */
-#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
-#define TIF_HRTICK_RESCHED	9	/* reprogram hrtick timer */
-#define TIF_MEMDIE		16
-#define TIF_DEBUG		17	/* uses debug registers */
-#define TIF_IO_BITMAP		18	/* uses I/O bitmap */
-#define TIF_FREEZE		19	/* is freezing for suspend */
-#define TIF_NOTSC		20	/* TSC is not accessible in userland */
-#define TIF_FORCED_TF		21	/* true if TF in eflags artificially */
-#define TIF_DEBUGCTLMSR		22	/* uses thread_struct.debugctlmsr */
-#define TIF_DS_AREA_MSR 	23      /* uses thread_struct.ds_area_msr */
-#define TIF_BTS_TRACE_TS        24      /* record scheduling event timestamps */
-
-#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
-#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
-#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
-#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_IRET		(1 << TIF_IRET)
-#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
-#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
-#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
-#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
-#define _TIF_HRTICK_RESCHED	(1 << TIF_HRTICK_RESCHED)
-#define _TIF_DEBUG		(1 << TIF_DEBUG)
-#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
-#define _TIF_FREEZE		(1 << TIF_FREEZE)
-#define _TIF_NOTSC		(1 << TIF_NOTSC)
-#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
-#define _TIF_DEBUGCTLMSR	(1 << TIF_DEBUGCTLMSR)
-#define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
-#define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)
-
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK							\
 	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT |	\
@@ -217,60 +231,6 @@ static inline struct thread_info *stack_
 
 #endif
 
-/*
- * thread information flags
- * - these are process state flags that various assembly files
- *   may need to access
- * - pending work-to-be-done flags are in LSW
- * - other flags in MSW
- * Warning: layout of LSW is hardcoded in entry.S
- */
-#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
-#define TIF_SIGPENDING		2	/* signal pending */
-#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
-#define TIF_SINGLESTEP		4	/* reenable singlestep on user return*/
-#define TIF_IRET		5	/* force IRET */
-#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
-#define TIF_SECCOMP		8	/* secure computing */
-#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */
-#define TIF_MCE_NOTIFY		10	/* notify userspace of an MCE */
-#define TIF_HRTICK_RESCHED	11	/* reprogram hrtick timer */
-/* 16 free */
-#define TIF_IA32		17	/* 32bit process */
-#define TIF_FORK		18	/* ret_from_fork */
-#define TIF_ABI_PENDING		19
-#define TIF_MEMDIE		20
-#define TIF_DEBUG		21	/* uses debug registers */
-#define TIF_IO_BITMAP		22	/* uses I/O bitmap */
-#define TIF_FREEZE		23	/* is freezing for suspend */
-#define TIF_FORCED_TF		24	/* true if TF in eflags artificially */
-#define TIF_DEBUGCTLMSR		25	/* uses thread_struct.debugctlmsr */
-#define TIF_DS_AREA_MSR		26      /* uses thread_struct.ds_area_msr */
-#define TIF_BTS_TRACE_TS	27      /* record scheduling event timestamps */
-#define TIF_NOTSC		28	/* TSC is not accessible in userland */
-
-#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
-#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
-#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
-#define _TIF_IRET		(1 << TIF_IRET)
-#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
-#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
-#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
-#define _TIF_MCE_NOTIFY		(1 << TIF_MCE_NOTIFY)
-#define _TIF_HRTICK_RESCHED	(1 << TIF_HRTICK_RESCHED)
-#define _TIF_IA32		(1 << TIF_IA32)
-#define _TIF_FORK		(1 << TIF_FORK)
-#define _TIF_ABI_PENDING	(1 << TIF_ABI_PENDING)
-#define _TIF_DEBUG		(1 << TIF_DEBUG)
-#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
-#define _TIF_FREEZE		(1 << TIF_FREEZE)
-#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
-#define _TIF_DEBUGCTLMSR	(1 << TIF_DEBUGCTLMSR)
-#define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
-#define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)
-#define _TIF_NOTSC		(1 << TIF_NOTSC)
-
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK							\
 	(0x0000FFFF &							\

-- 

[patch 8/9] x86: thread_info: merge tif masks.

[Christoph Lameter]

[-- Attachment #1: merge_tif_masks --]
[-- Type: text/plain, Size: 3063 bytes --]

The TIF masks are basically the same. x86_32 also has _TIF_SYSCALL_EMU which is
zero for the 64 bit case. The tif masks become the same.

x86_64 has an additional _TIF_DONOTIFY_MASK. Does not hurt for the 32 bit case
since it is only used in x86_64 arch code.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info.h |   51 +++++++++++++++++-------------------------
 1 file changed, 21 insertions(+), 30 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:57:21.724529078 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 17:57:48.509890170 -0700
@@ -123,6 +123,27 @@ struct thread_info {
 #define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
 #define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)
 
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK							\
+	(0x0000FFFF &							\
+	 ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|	\
+	 _TIF_SECCOMP|_TIF_SYSCALL_EMU))
+
+/* work to do on any return to user space */
+#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
+
+#define _TIF_DO_NOTIFY_MASK						\
+	(_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)
+
+/* flags to check in __switch_to() */
+#define _TIF_WORK_CTXSW							\
+	(_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS| \
+								_TIF_NOTSC)
+
+#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
+#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
+
+
 #define PREEMPT_ACTIVE		0x10000000
 
 #ifdef CONFIG_X86_32
@@ -174,20 +195,6 @@ static inline struct thread_info *curren
 
 #endif
 
-/* work to do on interrupt/exception return */
-#define _TIF_WORK_MASK							\
-	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT |	\
-			_TIF_SECCOMP | _TIF_SYSCALL_EMU))
-/* work to do on any return to u-space */
-#define _TIF_ALLWORK_MASK	(0x0000FFFF & ~_TIF_SECCOMP)
-
-/* flags to check in __switch_to() */
-#define _TIF_WORK_CTXSW						\
-	(_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUGCTLMSR |	\
-	 _TIF_DS_AREA_MSR | _TIF_BTS_TRACE_TS)
-#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
-#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW | _TIF_DEBUG)
-
 #else /* X86_32 */
 
 #include <asm/pda.h>
@@ -231,22 +238,6 @@ static inline struct thread_info *stack_
 
 #endif
 
-/* work to do on interrupt/exception return */
-#define _TIF_WORK_MASK							\
-	(0x0000FFFF &							\
-	 ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
-/* work to do on any return to user space */
-#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
-
-#define _TIF_DO_NOTIFY_MASK						\
-	(_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)
-
-/* flags to check in __switch_to() */
-#define _TIF_WORK_CTXSW							\
-	(_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS|_TIF_NOTSC)
-#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
-#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
-
 #endif /* !X86_32 */
 
 /*

-- 

[patch 9/9] x86: thread_info: Merge thread_info allocation

[Christoph Lameter]

[-- Attachment #1: join_thread_alloc --]
[-- Type: text/plain, Size: 3267 bytes --]

Make them similar so that both use THREAD_ORDER and THREAD_FLAGS and have a
THREAD_SIZE definition that is setup in asm/page_xx.h

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/page_32.h     |    8 ++++++++
 include/asm-x86/thread_info.h |   37 +++++++++++--------------------------
 2 files changed, 19 insertions(+), 26 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info.h	2008-04-28 17:57:48.509890170 -0700
+++ linux-2.6/include/asm-x86/thread_info.h	2008-04-28 18:05:32.639893442 -0700
@@ -132,6 +132,7 @@ struct thread_info {
 /* work to do on any return to user space */
 #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
 
+/* Only used for 64 bit */
 #define _TIF_DO_NOTIFY_MASK						\
 	(_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)
 
@@ -143,18 +144,21 @@ struct thread_info {
 #define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
 
-
 #define PREEMPT_ACTIVE		0x10000000
 
-#ifdef CONFIG_X86_32
-
-#ifdef CONFIG_4KSTACKS
-#define THREAD_SIZE            (4096)
+/* thread information allocation */
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
 #else
-#define THREAD_SIZE		(8192)
+#define THREAD_FLAGS GFP_KERNEL
 #endif
 
-#define STACK_WARN             (THREAD_SIZE/8)
+#define alloc_thread_info(tsk)						\
+	((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
+
+#ifdef CONFIG_X86_32
+
+#define STACK_WARN	(THREAD_SIZE/8)
 /*
  * macros/functions for gaining access to the thread information structure
  *
@@ -173,15 +177,6 @@ static inline struct thread_info *curren
 		(current_stack_pointer & ~(THREAD_SIZE - 1));
 }
 
-/* thread information allocation */
-#ifdef CONFIG_DEBUG_STACK_USAGE
-#define alloc_thread_info(tsk) ((struct thread_info *)			\
-	__get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(THREAD_SIZE)))
-#else
-#define alloc_thread_info(tsk) ((struct thread_info *)			\
-	__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)))
-#endif
-
 #else /* !__ASSEMBLY__ */
 
 /* how to get the thread information struct from ASM */
@@ -219,16 +214,6 @@ static inline struct thread_info *stack_
 	return ti;
 }
 
-/* thread information allocation */
-#ifdef CONFIG_DEBUG_STACK_USAGE
-#define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
-#else
-#define THREAD_FLAGS GFP_KERNEL
-#endif
-
-#define alloc_thread_info(tsk)						\
-	((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
-
 #else /* !__ASSEMBLY__ */
 
 /* how to get the thread information struct from ASM */
Index: linux-2.6/include/asm-x86/page_32.h
===================================================================
--- linux-2.6.orig/include/asm-x86/page_32.h	2008-04-24 22:36:10.593649417 -0700
+++ linux-2.6/include/asm-x86/page_32.h	2008-04-28 17:58:35.272390596 -0700
@@ -13,6 +13,14 @@
  */
 #define __PAGE_OFFSET		_AC(CONFIG_PAGE_OFFSET, UL)
 
+#ifdef CONFIG_4KSTACKS
+#define THREAD_ORDER	0
+#else
+#define THREAD_ORDER	1
+#endif
+#define THREAD_SIZE 	(PAGE_SIZE << THREAD_ORDER)
+
+
 #ifdef CONFIG_X86_PAE
 #define __PHYSICAL_MASK_SHIFT	36
 #define __VIRTUAL_MASK_SHIFT	32

-- 

Re: [patch 0/9] [RFC] x86: Merge thread_info_32/64 to thread_info.h

[Ingo Molnar]

* Christoph Lameter <clameter@sgi.com> wrote:

> The following patchset merges the 32 and 64 bit thread_info files into 
> one.
> 
> First just move the stuff into a single file and then gradually 
> extract common code. Ends up with pretty small differences. Had some 
> time last Saturday to play with it. Feedback/takeover appreciated.
> 
> Patch against git tree of today.

this unification looks very nicely structured. I'll throw it into the 
x86 testbed, lets see what happens.

	Ingo