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Commit be7436d5 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

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

arch/x86/kernel/fpu/core.c

+7 −7
Original line number Diff line number Diff line
@@ -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)

{