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authorDave Hansen <haveblue@us.ibm.com>2008-02-04 22:28:59 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:16 -0800
commit824552574162ac00ae636fa41386b1072379ea4a (patch)
tree85c595275c6007115ad002c56dbb7eb51ab67064 /include/asm-powerpc
parentec4dd3eb35759f9fbeb5c1abb01403b2fde64cc9 (diff)
downloadop-kernel-dev-824552574162ac00ae636fa41386b1072379ea4a.zip
op-kernel-dev-824552574162ac00ae636fa41386b1072379ea4a.tar.gz
maps4: rework TASK_SIZE macros
The following replaces the earlier patches sent. It should address David Rientjes's comments, and has been compile tested on all the architectures that it touches, save for parisc. For the /proc/<pid>/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 - MIPS portion from Ralf Baechle <ralf@linux-mips.org> [akpm@linux-foundation.org: fix mips build] Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Matt Mackall <mpm@selenic.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-powerpc')
-rw-r--r--include/asm-powerpc/processor.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index dba7c94..1f4765d 100644
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -99,8 +99,9 @@ extern struct task_struct *last_task_used_spe;
*/
#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
-#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
+#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
TASK_SIZE_USER32 : TASK_SIZE_USER64)
+#define TASK_SIZE TASK_SIZE_OF(current)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
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