From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 15 Apr 2015 09:51:26 +0000 (+0100)
Subject: x86/asm: Enable fast 32-bit put_user_64() for copy_to_user()
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~170^2~29^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a907738ab9840ca3d71c22cd28fba4cbae7f7ce;p=pandora-kernel.git

x86/asm: Enable fast 32-bit put_user_64() for copy_to_user()

For fixed sized copies, copy_to_user() will utilize
__put_user_size() fastpaths. However, it is missing the
translation for 64-bit copies on x86/32.

Testing on a Pinetrail Atom, the 64 bit put_user() fastpath
is substantially faster than the generic copy_to_user()
fallback.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: intel-gfx@lists.freedesktop.org
Link: http://lkml.kernel.org/r/1429091486-11443-1-git-send-email-chris@chris-wilson.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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