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Date:	Sat, 1 Feb 2014 17:38:27 -0800
From:	Linus Torvalds <>
To:	Suresh Siddha <>
Cc:	"H. Peter Anvin" <>,
	Nate Eldredge <>,
	Thomas Gleixner <>,
	Ingo Molnar <>,
	"the arch/x86 maintainers" <>,
	stable <>,
	Linux Kernel Mailing List <>,
	Maarten Baert <>,
	Jan Kara <>, George Spelvin <>,
	Pekka Riikonen <>
Subject: Re: [PATCH] Make math_state_restore() save and restore the interrupt flag

On Sat, Feb 1, 2014 at 5:35 PM, Suresh Siddha <> wrote:
> On Sat, Feb 1, 2014 at 5:26 PM, H. Peter Anvin <> wrote:
>> Even "b" does that, no?
> oh right. It needs an else. only for non-eager fpu case we should do stts()

It definitely does not want an else, I think.

If tsk_used_math() is false, or if the FPU restore failed, we
*definitely* need that stts(). Otherwise we'd return to user mode with
random contents in the FP state, and let user mode muck around with


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