From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e31.co.us.ibm.com ([32.97.110.149]:46846 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750963AbXHUTin (ORCPT ); Tue, 21 Aug 2007 15:38:43 -0400 Received: from d03relay04.boulder.ibm.com (d03relay04.boulder.ibm.com [9.17.195.106]) by e31.co.us.ibm.com (8.13.8/8.13.8) with ESMTP id l7LJcb1N010249 for ; Tue, 21 Aug 2007 15:38:37 -0400 Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d03relay04.boulder.ibm.com (8.13.8/8.13.8/NCO v8.5) with ESMTP id l7LJcbbj215698 for ; Tue, 21 Aug 2007 13:38:37 -0600 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l7LJcafB013347 for ; Tue, 21 Aug 2007 13:38:37 -0600 Subject: [RFC][PATCH] introduce TASK_SIZE_OF() for all arches From: Dave Hansen Date: Tue, 21 Aug 2007 12:38:35 -0700 Message-Id: <20070821193835.258D7DD4@kernel> Sender: linux-arch-owner@vger.kernel.org To: linux-arch@vger.kernel.org Cc: Dave Hansen List-ID: For the /proc//pagemap code[1], we need to able to query how much virtual address space a particular task has. The trick is that we do it through /proc and can't use TASK_SIZE since it references "current" on some arches. The process opening the /proc file might be a 32-bit process opening a 64-bit process's pagemap file. x86_64 already has a TASK_SIZE_OF() macro: #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64) I'd like to have that for other architectures. So, add it for all the architectures that actually use "current" in their TASK_SIZE. For the others, just add a quick #define in sched.h to use plain old TASK_SIZE. 1. http://www.linuxworld.com/news/2007/042407-kernel.html Signed-off-by: Dave Hansen --- lxc-dave/include/asm-ia64/processor.h | 3 ++- lxc-dave/include/asm-parisc/processor.h | 3 ++- lxc-dave/include/asm-powerpc/processor.h | 4 +++- lxc-dave/include/asm-s390/processor.h | 2 ++ lxc-dave/include/linux/sched.h | 4 ++++ 5 files changed, 13 insertions(+), 3 deletions(-) diff -puN include/asm-ia64/processor.h~task_size_of include/asm-ia64/processor.h --- lxc/include/asm-ia64/processor.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 +++ lxc-dave/include/asm-ia64/processor.h 2007-08-07 15:30:54.000000000 -0700 @@ -31,7 +31,8 @@ * each (assuming 8KB page size), for a total of 8TB of user virtual * address space. */ -#define TASK_SIZE (current->thread.task_size) +#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) +#define TASK_SIZE TASK_SIZE_OF(current) /* * This decides where the kernel will search for a free chunk of vm diff -puN include/asm-parisc/processor.h~task_size_of include/asm-parisc/processor.h --- lxc/include/asm-parisc/processor.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 +++ lxc-dave/include/asm-parisc/processor.h 2007-08-07 15:30:54.000000000 -0700 @@ -32,7 +32,8 @@ #endif #define current_text_addr() ({ void *pc; current_ia(pc); pc; }) -#define TASK_SIZE (current->thread.task_size) +#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) +#define TASK_SIZE (current->thread.task_size) #define TASK_UNMAPPED_BASE (current->thread.map_base) #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) diff -puN include/asm-powerpc/processor.h~task_size_of include/asm-powerpc/processor.h --- lxc/include/asm-powerpc/processor.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 +++ lxc-dave/include/asm-powerpc/processor.h 2007-08-07 15:30:54.000000000 -0700 @@ -107,7 +107,9 @@ extern struct task_struct *last_task_use */ #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE)) -#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ +#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ + TASK_SIZE_USER32 : TASK_SIZE_USER64) +#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ TASK_SIZE_USER32 : TASK_SIZE_USER64) /* This decides where the kernel will search for a free chunk of vm diff -puN include/asm-s390/processor.h~task_size_of include/asm-s390/processor.h --- lxc/include/asm-s390/processor.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 +++ lxc-dave/include/asm-s390/processor.h 2007-08-07 15:30:54.000000000 -0700 @@ -75,6 +75,8 @@ extern struct task_struct *last_task_use # define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \ (0x80000000UL) : (0x40000000000UL)) +# define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_31BIT) ? \ + (0x80000000UL) : (0x40000000000UL)) # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) # define DEFAULT_TASK_SIZE (0x40000000000UL) diff -puN include/linux/sched.h~task_size_of include/linux/sched.h --- lxc/include/linux/sched.h~task_size_of 2007-08-07 15:30:54.000000000 -0700 +++ lxc-dave/include/linux/sched.h 2007-08-07 15:30:54.000000000 -0700 @@ -1712,6 +1712,10 @@ static inline void inc_syscw(struct task } #endif +#ifndef TASK_SIZE_OF +#define TASK_SIZE_OF(tsk) TASK_SIZE +#endif + #endif /* __KERNEL__ */ #endif _