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x86/fpu: Remove the free_thread_xstate() complication 

Use fpstate_free() directly to manage FPU state.

Only process.c was using this method, so this is a speedup as well,
as it removes the extra function call and related clobbers.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Ingo Molnar 2015-04-22 11:44:46 +02:00
parent 146ed598d1
commit 11ad19277e
2 changed files with 2 additions and 8 deletions
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1
arch/x86/include/asm/processor.h
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@ -362,7 +362,6 @@ DECLARE_PER_CPU(struct irq_stack *, softirq_stack);
#endif /* X86_64 */
extern unsigned int xstate_size;
extern void free_thread_xstate(struct task_struct *);
extern struct kmem_cache *task_xstate_cachep;
struct perf_event;

9
arch/x86/kernel/process.c
View File

@ -99,14 +99,9 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
return 0;
}
void free_thread_xstate(struct task_struct *tsk)
{
fpstate_free(&tsk->thread.fpu);
}
void arch_release_task_struct(struct task_struct *tsk)
{
free_thread_xstate(tsk);
fpstate_free(&tsk->thread.fpu);
}
void arch_task_cache_init(void)
@ -154,7 +149,7 @@ void flush_thread(void)
if (!use_eager_fpu()) {
/* FPU state will be reallocated lazily at the first use. */
drop_fpu(tsk);
free_thread_xstate(tsk);
fpstate_free(&tsk->thread.fpu);
} else {
if (!tsk_used_math(tsk)) {
/* kthread execs. TODO: cleanup this horror. */