Commit-ID: 071ae621ec51153d740c9a2252d2d46e03e80d58
Gitweb: http://git.kernel.org/tip/071ae621ec51153d740c9a2252d2d46e03e80d58
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Fri, 3 Apr 2015 12:29:47 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:12 +0200
x86/fpu: Simplify fpu__unlazy_stopped()
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@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 | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 76006a7..5e4dae7 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -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;
}
--
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