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x86: add %gs accessors for x86_32

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Impact: cleanup

On x86_32, %gs is handled lazily.  It's not saved and restored on
kernel entry/exit but only when necessary which usually is during task
switch but there are few other places.  Currently, it's done by
calling savesegment() and loadsegment() explicitly.  Define
get_user_gs(), set_user_gs() and task_user_gs() and use them instead.

While at it, clean up register access macros in signal.c.

This cleans up code a bit and will help future changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tejun Heo
2009-02-09 22:17:40 +09:00
committed by Ingo Molnar
parent f0d96110f9
commit d9a89a26e0
9 changed files with 41 additions and 45 deletions
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2
arch/x86/include/asm/mmu_context.h
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@@ -79,7 +79,7 @@ do { \
#ifdef CONFIG_X86_32
#define deactivate_mm(tsk, mm) \
do { \
loadsegment(gs, 0); \
set_user_gs(task_pt_regs(tsk), 0); \
} while (0)
#else
#define deactivate_mm(tsk, mm) \