From: Ingo Molnar <mingo@kernel.org>
Date: Wed, 27 May 2015 10:22:29 +0000 (+0200)
Subject: x86/fpu: Optimize fpu__activate_fpstate_read()
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~203^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ba6b79102a594293c79f30319cabf476c5e300e;p=pandora-kernel.git

x86/fpu: Optimize fpu__activate_fpstate_read()

fpu__activate_fpstate_read() is used before FPU registers are
read from the fpstate by ptrace and core dumping.

It's not necessary to unlazy non-current child tasks in this case,
since the reading of registers is non-destructive.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Bobby Powers <bobbypowers@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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