Commit-ID: 8694c3e793810de3f7ff612d0fc23b70dc5a7e4d
Gitweb: http://git.kernel.org/tip/8694c3e793810de3f7ff612d0fc23b70dc5a7e4d
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Fri, 3 Apr 2015 12:28:15 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:11 +0200
x86/fpu: Optimize fpu__unlazy_stopped()
This function is only called for stopped child tasks, so the
fpu__save() branch will never get called - remove it.
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/kernel/i387.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 909d10d..76006a7 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -291,8 +291,6 @@ static int fpu__unlazy_stopped(struct task_struct *child)
return -EINVAL;
if (tsk_used_math(child)) {
- if (cpu_has_fpu && child == current)
- fpu__save(child);
task_disable_lazy_fpu_restore(child);
return 0;
}
--
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