linux-kernel - [PATCH 3/5] x86, fpu: don't drop_fpu() in exit_thread() if use_eager

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Message-ID: <20140824194740.GA27444@redhat.com>
Date:	Sun, 24 Aug 2014 21:47:40 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Bean Anderson <bean@...lsystems.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] x86, fpu: don't drop_fpu() in exit_thread() if
	use_eager_fpu()

Make exit_thread()->drop_fpu() depend on !use_eager_fpu(). This removes
another source of "use_eager_fpu() && !used_math()" special case.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 arch/x86/kernel/process.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 5df9447..7474f56 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -120,7 +120,8 @@ void exit_thread(void)
 		kfree(bp);
 	}
 
-	drop_fpu(me);
+	if (!use_eager_fpu())
+		drop_fpu(me);
 }
 
 void flush_thread(void)
-- 
1.5.5.1

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