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x86/fpu: Simplify fpregs_[un]lock()

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There is no point in disabling preemption and then disabling bottom
halfs.

Just disabling bottom halfs is sufficient as it implicitly disables
preemption on !RT kernels.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201027101349.455380473@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-10-27 11:09:50 +01:00
parent f8394f232b
commit 5f0c71278d
1 changed files with 3 additions and 2 deletions
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5
arch/x86/include/asm/fpu/api.h
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@ -29,17 +29,18 @@ extern void fpregs_mark_activate(void);
* A context switch will (and softirq might) save CPU's FPU registers to
* fpu->state and set TIF_NEED_FPU_LOAD leaving CPU's FPU registers in
* a random state.
*
* local_bh_disable() protects against both preemption and soft interrupts
* on !RT kernels.
*/
static inline void fpregs_lock(void)
{
preempt_disable();
local_bh_disable();
}
static inline void fpregs_unlock(void)
{
local_bh_enable();
preempt_enable();
}
#ifdef CONFIG_X86_DEBUG_FPU