diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2008-03-26 19:02:47 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-03-26 19:02:47 +0900 |
| commit | 9bbafce2eec190ef7e44b0eb1095ba17ce6ad3af (patch) | |
| tree | 8deae79efc43d39763bdba8ca9b670e6a1782859 /arch/sh/kernel/cpu/sh4 | |
| parent | 05dda977f2574c3341abef9b74c27d2b362e1e3a (diff) | |
sh: Fix occasional FPU register corruption under preempt.
Presently with preempt enabled there's the possibility to be preempted
after the TIF_USEDFPU test and the register save, leading to bogus
state post-__switch_to(). Use an explicit preempt_disable()/enable()
pair around unlazy_fpu()/clear_fpu() to avoid this. Follows the x86
change.
Reported-by: Takuo Koguchi <takuo.koguchi.sw@hitachi.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/cpu/sh4')
| -rw-r--r-- | arch/sh/kernel/cpu/sh4/fpu.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh4/fpu.c b/arch/sh/kernel/cpu/sh4/fpu.c index 817f9939cda6..8020796139f1 100644 --- a/arch/sh/kernel/cpu/sh4/fpu.c +++ b/arch/sh/kernel/cpu/sh4/fpu.c @@ -16,6 +16,7 @@ #include <asm/cpu/fpu.h> #include <asm/processor.h> #include <asm/system.h> +#include <asm/fpu.h> /* The PR (precision) bit in the FP Status Register must be clear when * an frchg instruction is executed, otherwise the instruction is undefined. |