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x86/fpu: Add comments to fpu__save() and restrict its export 

Add an explanation to fpu__save() and also don't export it to
random modules - we don't want them to futz around with deep kernel
internals.

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 11:01:36 +02:00
parent 0a78155154
commit 4af08f2f47
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kernel/i387.c
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@ -117,6 +117,9 @@ void __kernel_fpu_end(void)
}
EXPORT_SYMBOL(__kernel_fpu_end);
/*
* Save the FPU state (initialize it if necessary):
*/
void fpu__save(struct task_struct *tsk)
{
preempt_disable();
@ -130,7 +133,7 @@ void fpu__save(struct task_struct *tsk)
}
preempt_enable();
}
EXPORT_SYMBOL(fpu__save);
EXPORT_SYMBOL_GPL(fpu__save);
unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu;
unsigned int xstate_size;