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traps: x86_64: make math_state_restore more like i386

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- rename variable me -> tsk
 - get thread and tsk like i386
 - expand used_math()
 - copy comment

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Alexander van Heukelum 2008-10-03 23:16:12 +02:00 committed by Ingo Molnar
parent 699d2937d4
commit 091d30c8f7
1 changed files with 8 additions and 7 deletions
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15
arch/x86/kernel/traps_64.c
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@ -604,14 +604,15 @@ asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
*/
asmlinkage void math_state_restore(void)
{
struct task_struct *me = current;
struct thread_info *thread = current_thread_info();
struct task_struct *tsk = thread->task;
if (!used_math()) {
if (!tsk_used_math(tsk)) {
local_irq_enable();
/*
* does a slab alloc which can sleep
*/
if (init_fpu(me)) {
if (init_fpu(tsk)) {
/*
* ran out of memory!
*/
@ -625,13 +626,13 @@ asmlinkage void math_state_restore(void)
/*
* Paranoid restore. send a SIGSEGV if we fail to restore the state.
*/
if (unlikely(restore_fpu_checking(me))) {
if (unlikely(restore_fpu_checking(tsk))) {
stts();
force_sig(SIGSEGV, me);
force_sig(SIGSEGV, tsk);
return;
}
task_thread_info(me)->status |= TS_USEDFPU;
me->fpu_counter++;
thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */
tsk->fpu_counter++;
}
EXPORT_SYMBOL_GPL(math_state_restore);