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| author | Ingo Molnar <mingo@kernel.org> | 2015-04-03 11:06:43 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 15:47:10 +0200 |
| commit | 87cdb98affe54b6f390f4622b254569b90820817 (patch) | |
| tree | 49a705a48f5882bf752366ff28b406da3ea0700a /arch/x86/kernel/i387.c | |
| parent | 4af08f2f47f0ed3c48e557ac47ed2ae616d6866b (diff) | |
| download | talos-op-linux-87cdb98affe54b6f390f4622b254569b90820817.tar.gz talos-op-linux-87cdb98affe54b6f390f4622b254569b90820817.zip | |
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@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>
Diffstat (limited to 'arch/x86/kernel/i387.c')
| -rw-r--r-- | arch/x86/kernel/i387.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index ac47278cde71..66f1053ae2cd 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()) { |
