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x86/fpu: Simplify __save_fpu()

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__save_fpu() has this pattern:

		if (unlikely(system_state == SYSTEM_BOOTING))
			xsave_state_booting(&fpu->state.xsave);
		else
			xsave_state(&fpu->state.xsave);

... but it does not actually get called during system bootup.

So remove the complication and always call xsave_state().

To make sure this assumption is correct, add a WARN_ONCE()
debug check to xsave_state().

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 2015-04-27 09:23:43 +02:00
parent 32b49b3c83
commit 72ee6f87ad
2 changed files with 3 additions and 4 deletions
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2
arch/x86/include/asm/fpu/xsave.h
View File

@ -133,6 +133,8 @@ static inline int xsave_state(struct xsave_struct *fx)
u32 hmask = mask >> 32;
int err = 0;
WARN_ON(system_state == SYSTEM_BOOTING);
/*
* If xsaves is enabled, xsaves replaces xsaveopt because
* it supports compact format and supervisor states in addition to

5
arch/x86/kernel/fpu/core.c
View File

@ -172,10 +172,7 @@ EXPORT_SYMBOL_GPL(irq_ts_restore);
static void __save_fpu(struct fpu *fpu)
{
if (use_xsave()) {
if (unlikely(system_state == SYSTEM_BOOTING))
xsave_state_booting(&fpu->state.xsave);
else
xsave_state(&fpu->state.xsave);
xsave_state(&fpu->state.xsave);
} else {
fpu_fxsave(fpu);
}