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maps4: rework TASK_SIZE macros

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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 <[email protected]>

[[email protected]: fix mips build]
Signed-off-by: Dave Hansen <[email protected]>
Signed-off-by: Ralf Baechle <[email protected]>
Signed-off-by: Matt Mackall <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Dave Hansen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dave Hansen 2008-02-04 22:28:59 -08:00 • committed by Linus Torvalds
commit 8245525741
6 changed files with 14 additions and 4 deletions
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3
include/asm-s390/processor.h
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@ -70,8 +70,9 @@ extern int get_cpu_capability(unsigned int *);
#else /* __s390x__ */
# define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \
# define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
(0x80000000UL) : (0x40000000000UL))
# define TASK_SIZE TASK_SIZE_OF(current)
# define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
# define DEFAULT_TASK_SIZE (0x40000000000UL)