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Date: Sat, 1 Feb 2014 17:35:13 -0800
From: Suresh Siddha <sbsiddha@...il.com>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
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 5:26 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Even "b" does that, no?
oh right. It needs an else. only for non-eager fpu case we should do stts()
void __kernel_fpu_end(void)
{
if (use_eager_fpu()) {
struct task_struct *me = current;
if (tsk_used_math(me) && likely(!restore_fpu_checking(
me)))
return;
} else
stts();
}
thanks,
suresh
> "a" should be fine as long as we don't ever use
> those features in the kernel, even under kernel_fpu_begin/end().
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