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x86/fpu: Simplify fpu__unlazy_stopped()

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Open code the PF_USED_MATH logic, to make the logic more obvious.

(We'll slowly convert the other users of *_used_math() methods as well.)

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>
This commit is contained in:
Ingo Molnar 2015-04-03 12:29:47 +02:00
parent 8694c3e793
commit 071ae621ec
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/i387.c
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@ -290,7 +290,7 @@ static int fpu__unlazy_stopped(struct task_struct *child)
if (WARN_ON_ONCE(child == current))
return -EINVAL;
if (tsk_used_math(child)) {
if (child->flags & PF_USED_MATH) {
task_disable_lazy_fpu_restore(child);
return 0;
}
@ -304,7 +304,9 @@ static int fpu__unlazy_stopped(struct task_struct *child)
fpu_finit(&child->thread.fpu);
set_stopped_child_used_math(child);
/* Safe to do for stopped child tasks: */
child->flags |= PF_USED_MATH;
return 0;
}