Re: [tip:x86/urgent] x86, fpu: correct the asm constraints for fxsave , unbreak mxcsr.daz
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- Subject: Re: [tip:x86/urgent] x86, fpu: correct the asm constraints for fxsave , unbreak mxcsr.daz
- From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 26 Jul 2013 14:36:51 -0700
- Cc: linux-stable <stable@xxxxxxxxxxxxxxx>, Peter Anvin <hpa@xxxxxxxxxxxxxxx>, "H.J. Lu" <hjl.tools@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "tip-bot for H.J. Lu" <tipbot@xxxxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>
- In-reply-to: <51F2D9D2.8050405@zytor.com>
On Fri, Jul 26, 2013 at 1:19 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
> The bug is obvious; the fix at the very least *should* be obvious; the
> main source of risk would appear that it might trigger bugs in very old
> versions of gcc.
I used to be worried about "+m", but we're using it a lot these days,
and don't support the (really old) versions of gcc that used to have
trouble with in-out constraints. So the fix looks obvious and safe, no
worries from me.
Linus
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