Commit 87cdb98a authored Apr 03, 2015 by Ingo Molnar

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>

parent 4af08f2f

arch/x86/kernel/i387.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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()) {