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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-mips
parentec4dd3eb35759f9fbeb5c1abb01403b2fde64cc9 (diff)
downloadblackbird-op-linux-824552574162ac00ae636fa41386b1072379ea4a.tar.gz
blackbird-op-linux-824552574162ac00ae636fa41386b1072379ea4a.zip
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-mips')
-rw-r--r--include/asm-mips/processor.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-mips/processor.h b/include/asm-mips/processor.h
index 83bc94534084..36f42de59409 100644
--- a/include/asm-mips/processor.h
+++ b/include/asm-mips/processor.h
@@ -65,6 +65,8 @@ extern unsigned int vced_count, vcei_count;
#define TASK_UNMAPPED_BASE \
(test_thread_flag(TIF_32BIT_ADDR) ? \
PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
+#define TASK_SIZE_OF(tsk) \
+ (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
#endif
#define NUM_FPU_REGS 32
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