From: "H. Peter Anvin" <hpa@zytor.com>
To: Suresh Siddha <sbsiddha@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Nate Eldredge <nate@thatsmathematics.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
stable <stable@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Maarten Baert <maarten-baert@hotmail.com>,
Jan Kara <jack@suse.cz>, George Spelvin <linux@horizon.com>,
Pekka Riikonen <priikone@iki.fi>
Subject: Re: [PATCH] Make math_state_restore() save and restore the interrupt flag
Date: Sat, 01 Feb 2014 17:43:57 -0800 [thread overview]
Message-ID: <802bb1f1-1b0c-43d7-bd0e-3eb7ce93a0c2@email.android.com> (raw)
In-Reply-To: <CALmL7E_ijZStgyxj4Gnn69sEF-kv+eBE64+J7OBfn-K4cbBmJg@mail.gmail.com>
What does the inner if clause do? It looks like it returns either way...
On February 1, 2014 5:35:13 PM PST, Suresh Siddha <sbsiddha@gmail.com> wrote:
>On Sat, Feb 1, 2014 at 5:26 PM, H. Peter Anvin <hpa@zytor.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().
--
Sent from my mobile phone. Please pardon brevity and lack of formatting.
next prev parent reply other threads:[~2014-02-02 1:44 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-30 22:01 [PATCH] Make math_state_restore() save and restore the interrupt flag Nate Eldredge
2014-01-30 22:24 ` Linus Torvalds
2014-01-31 7:33 ` Suresh Siddha
2014-02-01 19:27 ` Linus Torvalds
2014-02-01 19:35 ` H. Peter Anvin
2014-02-01 19:46 ` Linus Torvalds
2014-02-01 20:00 ` H. Peter Anvin
2014-02-01 20:16 ` Linus Torvalds
2014-02-01 20:16 ` H. Peter Anvin
2014-02-01 21:17 ` George Spelvin
2014-02-01 21:36 ` H. Peter Anvin
2014-02-01 23:40 ` H. Peter Anvin
2014-02-02 0:17 ` Linus Torvalds
2014-02-02 1:19 ` George Spelvin
2014-02-02 1:25 ` H. Peter Anvin
2014-02-02 8:45 ` Pekka Riikonen
2014-02-02 1:06 ` Suresh Siddha
2014-02-02 1:26 ` H. Peter Anvin
2014-02-02 1:35 ` Suresh Siddha
2014-02-02 1:38 ` Linus Torvalds
2014-02-02 1:47 ` Suresh Siddha
2014-02-02 1:51 ` Linus Torvalds
2014-02-02 1:57 ` H. Peter Anvin
2014-02-02 2:05 ` Linus Torvalds
2014-02-02 2:12 ` H. Peter Anvin
2014-02-02 1:59 ` Suresh Siddha
2014-02-02 1:43 ` H. Peter Anvin [this message]
2014-02-02 1:47 ` Linus Torvalds
2014-02-02 7:19 ` Suresh Siddha
2014-02-02 19:15 ` Linus Torvalds
2014-02-03 6:56 ` Suresh Siddha
2014-02-03 18:20 ` Linus Torvalds
2014-02-04 6:03 ` Suresh Siddha
2014-02-06 5:26 ` Nate Eldredge
2014-02-06 5:34 ` George Spelvin
2014-02-13 15:45 ` Maarten Baert
2014-02-13 20:00 ` George Spelvin
2014-03-11 19:36 ` [tip:x86/urgent] x86, fpu: Check tsk_used_math() in kernel_fpu_end() for eager FPU tip-bot for Suresh Siddha
2014-02-27 23:44 ` [PATCH] Make math_state_restore() save and restore the interrupt flag H. Peter Anvin
2014-03-07 23:18 ` H. Peter Anvin
2014-03-08 6:18 ` Suresh Siddha
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