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Date: Sat, 1 Feb 2014 17:51:07 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Suresh Siddha <sbsiddha@...il.com> Cc: "H. Peter Anvin" <hpa@...or.com>, Nate Eldredge <nate@...tsmathematics.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, "the arch/x86 maintainers" <x86@...nel.org>, stable <stable@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Maarten Baert <maarten-baert@...mail.com>, Jan Kara <jack@...e.cz>, George Spelvin <linux@...izon.com>, Pekka Riikonen <priikone@....fi> Subject: Re: [PATCH] Make math_state_restore() save and restore the interrupt flag On Sat, Feb 1, 2014 at 5:47 PM, Suresh Siddha <sbsiddha@...il.com> 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. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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