[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
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/
Powered by blists - more mailing lists