Messages in this thread Patch in this message | | | From | Andy Lutomirski <> | Subject | [PATCH v2 4/5] x86/fpu: Speed up lazy FPU restores slightly | Date | Sun, 24 Jan 2016 14:38:09 -0800 |
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If we have an FPU, there's no need to check CR0 for FPU emulation.
Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/kernel/traps.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 87f80febf477..36a9c017540e 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -752,7 +752,7 @@ do_device_not_available(struct pt_regs *regs, long error_code) RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU"); #ifdef CONFIG_MATH_EMULATION - if (read_cr0() & X86_CR0_EM) { + if (!boot_cpu_has(X86_FEATURE_FPU) && (read_cr0() & X86_CR0_EM)) { struct math_emu_info info = { }; conditional_sti(regs); -- 2.5.0
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