[patch 16/20] x86, ptrace: add bts context unconditionally

[markus.t.metzger@intel.com]

[-- Attachment #1: tip.master.ptrace.arch_init_task.patch --]
[-- Type: text/plain, Size: 5153 bytes --]

Add the ptrace bts context field to task_struct unconditionally.

Initialize the field directly in copy_process().
Remove all the unneeded functionality used to initialize that field.


Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
---
 arch/x86/include/asm/ptrace.h |    9 	4 +	5 -	0 !
 arch/x86/kernel/ptrace.c      |   20 	1 +	19 -	0 !
 include/linux/ptrace.h        |   10 	0 +	10 -	0 !
 include/linux/sched.h         |    2 	0 +	2 -	0 !
 kernel/fork.c                 |    4 	2 +	2 -	0 !
 kernel/ptrace.c               |   10 	0 +	10 -	0 !
 6 files changed, 7 insertions(+), 48 deletions(-)

Index: b/arch/x86/include/asm/ptrace.h
===================================================================
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -235,12 +235,11 @@ extern int do_get_thread_area(struct tas
 extern int do_set_thread_area(struct task_struct *p, int idx,
 			      struct user_desc __user *info, int can_allocate);
 
-extern void x86_ptrace_untrace(struct task_struct *);
-extern void x86_ptrace_fork(struct task_struct *child,
-			    unsigned long clone_flags);
+#ifdef CONFIG_X86_PTRACE_BTS
+extern void ptrace_bts_untrace(struct task_struct *tsk);
 
-#define arch_ptrace_untrace(tsk) x86_ptrace_untrace(tsk)
-#define arch_ptrace_fork(child, flags) x86_ptrace_fork(child, flags)
+#define arch_ptrace_untrace(tsk)	ptrace_bts_untrace(tsk)
+#endif /* CONFIG_X86_PTRACE_BTS */
 
 #endif /* __KERNEL__ */
 
Index: b/include/linux/ptrace.h
===================================================================
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -94,7 +94,6 @@ extern void ptrace_notify(int exit_code)
 extern void __ptrace_link(struct task_struct *child,
 			  struct task_struct *new_parent);
 extern void __ptrace_unlink(struct task_struct *child);
-extern void ptrace_fork(struct task_struct *task, unsigned long clone_flags);
 #define PTRACE_MODE_READ   1
 #define PTRACE_MODE_ATTACH 2
 /* Returns 0 on success, -errno on denial. */
@@ -326,15 +325,6 @@ static inline void user_enable_block_ste
 #define arch_ptrace_untrace(task)		do { } while (0)
 #endif
 
-#ifndef arch_ptrace_fork
-/*
- * Do machine-specific work to initialize a new task.
- *
- * This is called from copy_process().
- */
-#define arch_ptrace_fork(child, clone_flags)	do { } while (0)
-#endif
-
 extern int task_current_syscall(struct task_struct *target, long *callno,
 				unsigned long args[6], unsigned int maxargs,
 				unsigned long *sp, unsigned long *pc);
Index: b/kernel/fork.c
===================================================================
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1100,8 +1100,8 @@ static struct task_struct *copy_process(
 #ifdef CONFIG_DEBUG_MUTEXES
 	p->blocked_on = NULL; /* not blocked yet */
 #endif
-	if (unlikely(current->ptrace))
-		ptrace_fork(p, clone_flags);
+
+	p->bts = NULL;
 
 	/* Perform scheduler related setup. Assign this task to a CPU. */
 	sched_fork(p, clone_flags);
Index: b/kernel/ptrace.c
===================================================================
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -27,16 +27,6 @@
 
 
 /*
- * Initialize a new task whose father had been ptraced.
- *
- * Called from copy_process().
- */
-void ptrace_fork(struct task_struct *child, unsigned long clone_flags)
-{
-	arch_ptrace_fork(child, clone_flags);
-}
-
-/*
  * ptrace a task: make the debugger its new parent and
  * move it to the ptrace list.
  *
Index: b/arch/x86/kernel/ptrace.c
===================================================================
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -888,37 +888,19 @@ static int ptrace_bts_size(struct task_s
 	return (trace->ds.top - trace->ds.begin) / trace->ds.size;
 }
 
-static inline void ptrace_bts_fork(struct task_struct *tsk)
-{
-	tsk->bts = NULL;
-}
-
 /*
  * Called from __ptrace_unlink() after the child has been moved back
  * to its original parent.
  */
-static inline void ptrace_bts_untrace(struct task_struct *child)
+void ptrace_bts_untrace(struct task_struct *child)
 {
 	if (unlikely(child->bts)) {
 		free_bts_context(child->bts);
 		child->bts = NULL;
 	}
 }
-#else
-static inline void ptrace_bts_fork(struct task_struct *tsk) {}
-static inline void ptrace_bts_untrace(struct task_struct *child) {}
 #endif /* CONFIG_X86_PTRACE_BTS */
 
-void x86_ptrace_fork(struct task_struct *child, unsigned long clone_flags)
-{
-	ptrace_bts_fork(child);
-}
-
-void x86_ptrace_untrace(struct task_struct *child)
-{
-	ptrace_bts_untrace(child);
-}
-
 /*
  * Called by kernel/ptrace.c when detaching..
  *
Index: b/include/linux/sched.h
===================================================================
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1207,13 +1207,11 @@ struct task_struct {
 	struct list_head ptraced;
 	struct list_head ptrace_entry;
 
-#ifdef CONFIG_X86_PTRACE_BTS
 	/*
 	 * This is the tracer handle for the ptrace BTS extension.
 	 * This field actually belongs to the ptracer task.
 	 */
 	struct bts_context *bts;
-#endif /* CONFIG_X86_PTRACE_BTS */
 
 	/* PID/PID hash table linkage. */
 	struct pid_link pids[PIDTYPE_MAX];

-- 

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