Re: 2.6.10-rc3, i386: fpu handling on sigreturn

From: Andi Kleen
Date: Wed Dec 22 2004 - 18:56:12 EST

On Thu, Dec 23, 2004 at 12:49:39AM +0100, Bodo Stroesser wrote:
> Andi Kleen wrote:
> >Bodo Stroesser <bstroesser@xxxxxxxxxxxxxxxxxxx> writes:
> >
> >>Now, the interrupted processes fpu no longer is cleared!
> >
> >
> >I agree it's a bug, although it's probably pretty obscure so people
> >didn't notice it. The right fix would be to just clear_fpu again
> >in this case. The problem has been in Linux forever.
> Wouldn't it be better to also reset used_math to 0? (As it has been,
> before the sighandler was started)

It would only be an optimization, and i doubt it's worth to optimize for
such an obscure case.

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