linux-kernel - Re: [PATCH v2 20/31] arm64: User access library function

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Message-ID: <20120905191312.GH24085@n2100.arm.linux.org.uk>
Date:	Wed, 5 Sep 2012 20:13:12 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	linux-arch@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 20/31] arm64: User access library function

On Wed, Aug 15, 2012 at 02:49:54PM +0000, Arnd Bergmann wrote:
> It's fairly unusual to have out of line get_user/put_user functions.
> What is the reason for this, other than copying from ARM?

Actually, we never used to out of line on ARM, and then I experimented,
and found there was a net benefit - not only in code size but also
there appeared to be a performance benefit by out of lining them.
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