AcoSail/kernel_optimize_test
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i387: move TS_USEDFPU clearing out of __save_init_fpu and into callers

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Touching TS_USEDFPU without touching CR0.TS is confusing, so don't do
it.  By moving it into the callers, we always do the TS_USEDFPU next to
the CR0.TS accesses in the source code, and it's much easier to see how
the two go hand in hand.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2012-02-16 12:22:48 -08:00
parent 15d8791cae
commit b6c66418dc
1 changed files with 6 additions and 3 deletions
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9
arch/x86/include/asm/i387.h
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@ -259,7 +259,6 @@ static inline void fpu_save_init(struct fpu *fpu)
static inline void __save_init_fpu(struct task_struct *tsk)
{
fpu_save_init(&tsk->thread.fpu);
task_thread_info(tsk)->status &= ~TS_USEDFPU;
}
static inline int fpu_fxrstor_checking(struct fpu *fpu)
@ -290,6 +289,7 @@ static inline void __unlazy_fpu(struct task_struct *tsk)
{
if (task_thread_info(tsk)->status & TS_USEDFPU) {
__save_init_fpu(tsk);
task_thread_info(tsk)->status &= ~TS_USEDFPU;
stts();
} else
tsk->fpu_counter = 0;
@ -356,9 +356,11 @@ static inline void kernel_fpu_begin(void)
WARN_ON_ONCE(!irq_fpu_usable());
preempt_disable();
if (me->status & TS_USEDFPU)
if (me->status & TS_USEDFPU) {
__save_init_fpu(me->task);
else
me->status &= ~TS_USEDFPU;
/* We do 'stts()' in kernel_fpu_end() */
} else
clts();
}
@ -449,6 +451,7 @@ static inline void save_init_fpu(struct task_struct *tsk)
WARN_ON_ONCE(!(task_thread_info(tsk)->status & TS_USEDFPU));
preempt_disable();
__save_init_fpu(tsk);
task_thread_info(tsk)->status &= ~TS_USEDFPU;
stts();
preempt_enable();
}