linux-kernel - Re: [PATCH] x86: Enable fast 32-bit put_user_64 for copy_to

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Message-ID: <20150416072802.GA4998@gmail.com>
Date:	Thu, 16 Apr 2015 09:28:02 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	intel-gfx@...ts.freedesktop.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Enable fast 32-bit put_user_64 for copy_to_user


* Chris Wilson <chris@...is-wilson.co.uk> wrote:

> For fixed sized copies, copy_to_user() will utilize __put_user_size
> fastpaths. However, it is missing the translation for 64bit 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.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> CC: linux-kernel@...r.kernel.org

The patch makes sense, but your Signed-off-by line is missing.

Thanks,

	Ingo
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