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Date:	Sat, 1 Feb 2014 17:51:07 -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 5:47 PM, Suresh Siddha <> wrote:
> So if the restore failed, we should do something like drop_init_fpu(),
> which will restore init-state to the registers.
> for eager-fpu()  paths we don't use clts() stts() etc.

Uhhuh. Ok.

Why do we do that, btw? I think it would make much more sense to just
do what I *thought* we did, and just make it a context-switch-time
optimization ("let's always switch FP state"), not make it a huge
semantic difference.

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