linux-kernel - Re: [PATCH 1/1] dma-mapping: to avoid exception when cpu

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Message-ID: <20160307114116.54160865@lxorguk.ukuu.org.uk>
Date:	Mon, 7 Mar 2016 11:41:16 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Zhen Lei <thunder.leizhen@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	"Tianhong Ding" <dingtianhong@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH 1/1] dma-mapping: to avoid exception when cpu_addr is
 NULL

On Mon, 7 Mar 2016 17:21:25 +0800
Zhen Lei <thunder.leizhen@...wei.com> wrote:

> Do this to keep consistent with kfree, which tolerate ptr is NULL.
> 
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>

This is inlined code so you are adding extra logic to every single
instance of a call to the function. What is it's total effect on kernel
size ?

Alan