Commit-ID: 87cdb98affe54b6f390f4622b254569b90820817
Gitweb: http://git.kernel.org/tip/87cdb98affe54b6f390f4622b254569b90820817
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Fri, 3 Apr 2015 11:06:43 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:10 +0200
x86/fpu: Add debugging check to fpu__save()
Document the function a bit more and add debugging check that we are only
running this with the current task.
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 | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index ac47278c..66f1053 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -119,9 +119,13 @@ EXPORT_SYMBOL(__kernel_fpu_end);
/*
* Save the FPU state (initialize it if necessary):
+ *
+ * This only ever gets called for the current task.
*/
void fpu__save(struct task_struct *tsk)
{
+ WARN_ON(tsk != current);
+
preempt_disable();
if (__thread_has_fpu(tsk)) {
if (use_eager_fpu()) {
--
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