From: tip-bot for Oleg Nesterov <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: dave.hansen@intel.com, sbsiddha@gmail.com,
quentin.casasnovas@oracle.com, torvalds@linux-foundation.org,
bp@suse.de, linux-kernel@vger.kernel.org, hpa@zytor.com,
riel@redhat.com, fenghua.yu@intel.com, mingo@kernel.org,
tglx@linutronix.de, luto@amacapital.net, oleg@redhat.com,
priikone@iki.fi
Subject: [tip:x86/fpu] x86/fpu: Introduce restore_init_xstate()
Date: Mon, 23 Mar 2015 05:20:59 -0700 [thread overview]
Message-ID: <tip-8f4d81863ba4e8dfee93bd50840f1099a296251f@git.kernel.org> (raw)
In-Reply-To: <20150311173429.GD5032@redhat.com>
Commit-ID: 8f4d81863ba4e8dfee93bd50840f1099a296251f
Gitweb: http://git.kernel.org/tip/8f4d81863ba4e8dfee93bd50840f1099a296251f
Author: Oleg Nesterov <oleg@redhat.com>
AuthorDate: Wed, 11 Mar 2015 18:34:29 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 23 Mar 2015 10:13:58 +0100
x86/fpu: Introduce restore_init_xstate()
Extract the "use_eager_fpu()" code from drop_init_fpu() into a new,
simple helper restore_init_xstate(). The next patch adds another user.
- It is not clear why we do not check use_fxsr() like fpu_restore_checking()
does. eager_fpu_init_bp() calls setup_init_fpu_buf() too, and we have the
"eagerfpu=on" kernel option.
- Ignoring the fact that init_xstate_buf is "struct xsave_struct *", not
"union thread_xstate *", it is not clear why we can not simply use
fpu_restore_checking() and avoid the code duplication.
- It is not clear why we can't call setup_init_fpu_buf() unconditionally
to always create init_xstate_buf(). Then do_device_not_available() path
(at least) could use restore_init_xstate() too. It doesn't need to init
fpu->state, its content doesn't matter until unlazy_fpu()/__switch_to()/etc
which overwrites this memory anyway.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pekka Riikonen <priikone@iki.fi>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Suresh Siddha <sbsiddha@gmail.com>
Link: http://lkml.kernel.org/r/20150311173429.GD5032@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/fpu-internal.h | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index c58c930..7d2f7fa 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -401,16 +401,20 @@ static inline void drop_fpu(struct task_struct *tsk)
preempt_enable();
}
+static inline void restore_init_xstate(void)
+{
+ if (use_xsave())
+ xrstor_state(init_xstate_buf, -1);
+ else
+ fxrstor_checking(&init_xstate_buf->i387);
+}
+
static inline void drop_init_fpu(struct task_struct *tsk)
{
if (!use_eager_fpu())
drop_fpu(tsk);
- else {
- if (use_xsave())
- xrstor_state(init_xstate_buf, -1);
- else
- fxrstor_checking(&init_xstate_buf->i387);
- }
+ else
+ restore_init_xstate();
}
/*
next prev parent reply other threads:[~2015-03-23 12:21 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-04 18:30 Oops with tip/x86/fpu Dave Hansen
2015-03-04 19:06 ` Oleg Nesterov
2015-03-04 19:12 ` Dave Hansen
2015-03-04 20:06 ` Borislav Petkov
2015-03-05 15:14 ` Oleg Nesterov
[not found] ` <20150305182203.GA4203@redhat.com>
2015-03-05 18:34 ` Dave Hansen
2015-03-05 18:46 ` Oleg Nesterov
2015-03-05 18:41 ` Dave Hansen
2015-03-26 22:37 ` Yu, Fenghua
2015-03-26 22:43 ` Dave Hansen
2015-03-26 22:48 ` Yu, Fenghua
2015-03-27 7:30 ` Quentin Casasnovas
2015-03-27 19:06 ` Oleg Nesterov
2015-03-05 8:38 ` Quentin Casasnovas
2015-03-05 15:13 ` Oleg Nesterov
2015-03-05 18:42 ` Borislav Petkov
2015-03-05 22:16 ` Dave Hansen
2015-03-05 19:51 ` [PATCH 0/1] x86/fpu: math_state_restore() should not blindly disable irqs Oleg Nesterov
2015-03-05 19:51 ` [PATCH 1/1] " Oleg Nesterov
2015-03-05 20:11 ` Ingo Molnar
2015-03-05 21:25 ` Oleg Nesterov
2015-03-06 7:58 ` Ingo Molnar
2015-03-06 13:26 ` Oleg Nesterov
2015-03-06 13:39 ` Oleg Nesterov
2015-03-06 13:46 ` Ingo Molnar
2015-03-06 14:01 ` Oleg Nesterov
2015-03-06 14:17 ` Oleg Nesterov
2015-03-06 15:00 ` David Vrabel
2015-03-06 15:36 ` Oleg Nesterov
2015-03-06 16:15 ` David Vrabel
2015-03-06 16:31 ` Oleg Nesterov
2015-03-06 17:33 ` Linus Torvalds
2015-03-06 18:15 ` Oleg Nesterov
2015-03-06 19:23 ` Andy Lutomirski
2015-03-06 22:00 ` Linus Torvalds
2015-03-06 22:28 ` Andy Lutomirski
2015-03-07 10:36 ` Ingo Molnar
2015-03-07 20:11 ` Linus Torvalds
2015-03-08 8:55 ` Ingo Molnar
2015-03-08 11:38 ` Ingo Molnar
2015-03-08 13:59 ` Andy Lutomirski
2015-03-08 14:38 ` Andy Lutomirski
2015-03-07 10:32 ` Ingo Molnar
2015-03-07 15:38 ` [PATCH 0/1] x86/fpu: x86/fpu: avoid math_state_restore() without used_math() in __restore_xstate_sig() Oleg Nesterov
2015-03-07 15:38 ` [PATCH 1/1] " Oleg Nesterov
2015-03-09 14:07 ` Borislav Petkov
2015-03-09 14:34 ` Oleg Nesterov
2015-03-09 15:18 ` Borislav Petkov
2015-03-09 16:24 ` Oleg Nesterov
2015-03-09 16:53 ` Borislav Petkov
2015-03-09 17:05 ` Oleg Nesterov
2015-03-09 17:23 ` Borislav Petkov
2015-03-16 12:07 ` [tip:x86/urgent] x86/fpu: Avoid " tip-bot for Oleg Nesterov
2015-03-05 20:35 ` [PATCH 0/1] x86/fpu: math_state_restore() should not blindly disable irqs Oleg Nesterov
2015-03-09 17:10 ` [PATCH] x86/fpu: drop_fpu() should not assume that tsk == current Oleg Nesterov
2015-03-09 17:36 ` Rik van Riel
2015-03-09 17:48 ` Borislav Petkov
2015-03-09 18:06 ` Oleg Nesterov
2015-03-09 18:10 ` Borislav Petkov
2015-03-16 12:07 ` [tip:x86/urgent] x86/fpu: Drop_fpu() should not assume that tsk equals current tip-bot for Oleg Nesterov
2015-03-11 17:33 ` [PATCH 0/4] x86/fpu: avoid math_state_restore() on kthread exec Oleg Nesterov
2015-03-11 17:34 ` [PATCH 1/4] x86/fpu: document user_fpu_begin() Oleg Nesterov
2015-03-13 9:47 ` Borislav Petkov
2015-03-13 14:34 ` Oleg Nesterov
2015-03-23 12:20 ` [tip:x86/fpu] x86/fpu: Document user_fpu_begin() tip-bot for Oleg Nesterov
2015-03-11 17:34 ` [PATCH 2/4] x86/fpu: introduce restore_init_xstate() Oleg Nesterov
2015-03-13 10:34 ` Borislav Petkov
2015-03-13 14:39 ` Oleg Nesterov
2015-03-13 15:20 ` Borislav Petkov
2015-03-16 19:05 ` Rik van Riel
2015-03-23 12:20 ` tip-bot for Oleg Nesterov [this message]
2015-03-11 17:34 ` [PATCH 3/4] x86/fpu: use restore_init_xstate() instead of math_state_restore() on kthread exec Oleg Nesterov
2015-03-13 10:48 ` Borislav Petkov
2015-03-13 14:45 ` Oleg Nesterov
2015-03-13 15:51 ` Borislav Petkov
2015-03-23 12:21 ` [tip:x86/fpu] x86/fpu: Use " tip-bot for Oleg Nesterov
2015-03-11 17:35 ` [PATCH 4/4] x86/fpu: don't abuse drop_init_fpu() in flush_thread() Oleg Nesterov
2015-03-13 10:52 ` Borislav Petkov
2015-03-13 14:55 ` Oleg Nesterov
2015-03-13 16:19 ` Borislav Petkov
2015-03-13 16:26 ` Oleg Nesterov
2015-03-13 19:27 ` Borislav Petkov
2015-03-14 14:48 ` Oleg Nesterov
2015-03-15 17:36 ` Borislav Petkov
2015-03-15 18:16 ` Oleg Nesterov
2015-03-15 18:50 ` Borislav Petkov
2015-03-15 20:04 ` Oleg Nesterov
2015-03-15 20:38 ` Borislav Petkov
2015-03-16 9:35 ` Borislav Petkov
2015-03-16 10:28 ` Ingo Molnar
2015-03-16 14:39 ` Oleg Nesterov
2015-03-16 15:26 ` Borislav Petkov
2015-03-16 15:34 ` Andy Lutomirski
2015-03-16 15:35 ` Borislav Petkov
2015-03-13 17:30 ` [PATCH v2 " Oleg Nesterov
2015-03-14 10:55 ` Borislav Petkov
2015-03-14 10:57 ` [PATCH] x86/fpu: Fold __drop_fpu() into its sole user Borislav Petkov
2015-03-14 15:15 ` Oleg Nesterov
2015-03-16 10:27 ` Ingo Molnar
2015-03-23 12:21 ` [tip:x86/fpu] x86/fpu: Don't abuse drop_init_fpu() in flush_thread() tip-bot for Oleg Nesterov
2015-03-13 18:26 ` [PATCH 0/1] x86/cpu: don't allocate fpu->state for swapper/0 Oleg Nesterov
2015-03-13 18:27 ` [PATCH 1/1] " Oleg Nesterov
2015-03-16 10:18 ` Borislav Petkov
2015-03-23 12:22 ` [tip:x86/fpu] x86/fpu: Don't " tip-bot for Oleg Nesterov
2015-03-14 11:16 ` [PATCH 0/1] x86/cpu: don't " Borislav Petkov
2015-03-14 15:13 ` [PATCH 0/1] x86/cpu: kill eager_fpu_init_bp() Oleg Nesterov
2015-03-14 15:13 ` [PATCH 1/1] " Oleg Nesterov
2015-03-16 12:44 ` Borislav Petkov
2015-03-23 12:22 ` [tip:x86/fpu] x86/fpu: Kill eager_fpu_init_bp() tip-bot for Oleg Nesterov
2015-03-15 16:49 ` [PATCH RFC 0/2] x86/fpu: avoid "xstate_fault" in xsave_user/xrestore_user Oleg Nesterov
2015-03-15 16:50 ` [PATCH RFC 1/2] x86: introduce __user_insn() and __check_insn() Oleg Nesterov
2015-03-15 16:50 ` [PATCH RFC 2/2] x86/fpu: change xsave_user() and xrestore_user() to use __user_insn() Oleg Nesterov
2015-03-16 22:43 ` Quentin Casasnovas
2015-03-17 9:35 ` Borislav Petkov
2015-03-16 14:36 ` [PATCH RFC 0/2] x86/fpu: avoid "xstate_fault" in xsave_user/xrestore_user Borislav Petkov
2015-03-16 14:57 ` Oleg Nesterov
2015-03-16 17:58 ` Borislav Petkov
2015-03-16 22:37 ` Quentin Casasnovas
2015-03-17 9:47 ` Borislav Petkov
2015-03-17 10:00 ` Quentin Casasnovas
2015-03-17 11:20 ` Borislav Petkov
2015-03-17 11:36 ` Quentin Casasnovas
2015-03-17 12:07 ` Borislav Petkov
2015-03-18 9:06 ` Quentin Casasnovas
2015-03-18 9:53 ` Borislav Petkov
2015-03-17 10:07 ` Quentin Casasnovas
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