Commit-ID: 11ad19277e025f914518bc2943a240cdd37cf844
Gitweb: http://git.kernel.org/tip/11ad19277e025f914518bc2943a240cdd37cf844
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Wed, 22 Apr 2015 11:44:46 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:17 +0200
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@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/include/asm/processor.h | 1 -
arch/x86/kernel/process.c | 9 ++-------
2 files changed, 2 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 6b75c4b..fef8db0 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -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;
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 35d0f19..6ab180f 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -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. */
--
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