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

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Date:	Tue, 3 Oct 2006 12:05:24 +0200
From:	Andi Kleen <ak@...e.de>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	Linus Torvalds <torvalds@...l.org>, akpm <akpm@...l.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC] Math-emu kills the kernel on Athlon64 X2

 
> void mxcsr_feature_mask_init(void)
> {
> 	unsigned long mask = 0;
> 	clts();
> 	if (cpu_has_fxsr) {
> 		memset(&current->thread.i387.fxsave, 0, sizeof(struct i387_fxsave_struct));
> 		asm volatile("fxsave %0" : : "m" (current->thread.i387.fxsave)); 
> 		mask = current->thread.i387.fxsave.mxcsr_mask;
> 		if (mask == 0) mask = 0x0000ffbf;
> 	}

This just needs an ifdef. I'll fix that thanks.

-Andi
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