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SubjectRe: [PATCH/RFC] Math-emu kills the kernel on Athlon64 X2

On Mon, 2 Oct 2006, Randy Dunlap wrote:
> OK, how about something more direct and less obtrusive, like this?

I think this is fine, but I also think it's a bit hacky.

Wouldn't it make more sense to make the whole "nofxsr" thing just clear
the capability, ie just a diff like the appended...

Does that work for you? If so, we should _also_ make sure that "no387"
calls this function too, so that you don't have to do _both_ no387 and
nofxsr, which is clearly silly. Once you do no387, the kernel should do
the nofxsr for you, methinks..


diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index 2799baa..7ac3c9e 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -185,6 +185,7 @@ static void __cpuinit get_cpu_vendor(str
static int __init x86_fxsr_setup(char * s)
disable_x86_fxsr = 1;
+ clear_bit(X86_FEATURE_FXSR, boot_cpu_data.x86_capability);
return 1;
__setup("nofxsr", x86_fxsr_setup);
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