Commit be7436d5 authored by Ingo Molnar's avatar Ingo Molnar

x86/fpu: Clarify ancient comments in fpu__restore()

So this function still had ancient language about 'saving current
math information' - but we haven't been doing lazy FPU saves for
quite some time, we are doing lazy FPU restores.

Also remove IRQ13 related comment, which we don't support anymore
either.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
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: default avatarIngo Molnar <mingo@kernel.org>
parent 2a52af8b
......@@ -319,14 +319,14 @@ static void fpu__activate_stopped(struct fpu *child_fpu)
}
/*
* 'fpu__restore()' saves the current math information in the
* old math state array, and gets the new ones from the current task
* 'fpu__restore()' is called to copy FPU registers from
* the FPU fpstate to the live hw registers and to activate
* access to the hardware registers, so that FPU instructions
* can be used afterwards.
*
* Careful.. There are problems with IBM-designed IRQ13 behaviour.
* Don't touch unless you *really* know how it works.
*
* Must be called with kernel preemption disabled (eg with local
* local interrupts as in the case of do_device_not_available).
* Must be called with kernel preemption disabled (for example
* with local interrupts disabled, as it is in the case of
* do_device_not_available()).
*/
void fpu__restore(void)
{
......
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