linux-kernel - Re: [PATCH v3 3/9] net: xfrm: use __this_cpu

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Message-ID: <50A054D4.2070404@gmail.com>
Date:	Mon, 12 Nov 2012 09:45:56 +0800
From:	Shan Wei <shanwei88@...il.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	steffen.klassert@...unet.com, David Miller <davem@...emloft.net>,
	NetDev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Kernel-Maillist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/9] net: xfrm: use __this_cpu_read per-cpu helper

Christoph Lameter said, at 2012/11/10 4:12:
> On Fri, 9 Nov 2012, Shan Wei wrote:
> 
>> v3 fix compile warning:
>> net/xfrm/xfrm_ipcomp.c: In function 'ipcomp_alloc_tfms':
>> net/xfrm/xfrm_ipcomp.c:285: warning: assignment from incompatible pointer type
> 
> Why exactly is the pointer type not compatible? Looks like we have a
> problem here.
> 

pos->tfms(struct crypto_comp **tfms) is a double pointer that point to struct crypto_comp.
returned value is a pointer that point to struct crypto_comp;
So, we need to dereference and then read.

+ tfm = __this_cpu_read(*pos->tfms);

I will update this patch in v4 to fix it.

Thanks~
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