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[MIPS] Retry {save,restore}_fp_context if failed in atomic context.

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The save_fp_context()/restore_fp_context() might sleep on accessing
user stack and therefore might lose FPU ownership in middle of them.

If these function failed due to "in_atomic" test in do_page_fault,
touch the sigcontext area in non-atomic context and retry these
save/restore operation.

This is a replacement of a (broken) fix which was titled "Allow CpU
exception in kernel partially".

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto
2007-04-16 23:19:44 +09:00
committed by Ralf Baechle
parent 5323180db7
commit faea623464
4 changed files with 102 additions and 20 deletions
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include/asm-mips/fpu.h
+7 -2
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@@ -100,14 +100,19 @@ static inline void __own_fpu(void)
set_thread_flag(TIF_USEDFPU);
}
static inline void own_fpu(int restore)
static inline void own_fpu_inatomic(int restore)
{
preempt_disable();
if (cpu_has_fpu && !__is_fpu_owner()) {
__own_fpu();
if (restore)
_restore_fp(current);
}
}
static inline void own_fpu(int restore)
{
preempt_disable();
own_fpu_inatomic(restore);
preempt_enable();
}