mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Hiro Yoshioka <lkml.hyoshiok@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: math_state_restore() question
Date: Wed, 17 Aug 2005 16:58:13 +0900	[thread overview]
Message-ID: <98df96d305081700581ebdd5ed@mail.gmail.com> (raw)

Hi,

I have a quick question.

The math_state_restore() restores the FPU/MMX/XMM states.
However where do we save the previous task's states if it is necessary?

asmlinkage void math_state_restore(struct pt_regs regs)
{
        struct thread_info *thread = current_thread_info();
        struct task_struct *tsk = thread->task;

        clts();         /* Allow maths ops (or we recurse) */
        if (!tsk_used_math(tsk))
                init_fpu(tsk);
        restore_fpu(tsk);
        thread->status |= TS_USEDFPU;   /* So we fnsave on switch_to() */
}

Thanks in advance,
  Hiro
-- 
Hiro Yoshioka
mailto:hyoshiok at miraclelinux.com

             reply	other threads:[~2005-08-17  7:58 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-17  7:58 Hiro Yoshioka [this message]
2005-08-17  8:07 ` Hirokazu Takahashi
2005-08-17  8:42   ` Hiro Yoshioka
2005-08-17 15:18     ` Akira Tsukamoto

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=98df96d305081700581ebdd5ed@mail.gmail.com \
    --to=lkml.hyoshiok@gmail.com \
    --cc=hyoshiok@miraclelinux.com \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®