linux-kernel - Re: linux-next: build failure after merge of the akpm-current tree

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Message-Id: <20140514145520.f010e4593071cf5a756ddc5b@linux-foundation.org>
Date:	Wed, 14 May 2014 14:55:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Tejun Heo <tj@...nel.org>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.cz>
Subject: Re: linux-next: build failure after merge of the akpm-current tree

On Wed, 14 May 2014 17:47:49 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:

> Hi Andrew,
> 
> After merging the akpm-current tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
> 
> mm/memcontrol.c: In function 'mem_cgroup_write':
> mm/memcontrol.c:5088:45: error: 'buffer' undeclared (first use in this function)
>    ret = res_counter_memparse_write_strategy(buffer, &val);
>                                              ^
> mm/memcontrol.c: At top level:
> /scratch/sfr/next/mm/memcontrol.c:6029:3: error: unknown field 'write_string' specified in initializer
>    .write_string = mem_cgroup_write,
>    ^
> 
> Caused by commit a4bf584ed8c2 ("memcg: allow setting low_limit")
> interacting with commit 451af504df0c ("cgroup: replace
> cftype->write_string() with cftype->write()") from the cgroup tree.
> (I love API changes and unnecessary variable renaming :-()
> 
> ...
>
> @@ -6026,7 +6026,7 @@ static struct cftype mem_cgroup_files[] = {
>  	{
>  		.name = "low_limit_in_bytes",
>  		.private = MEMFILE_PRIVATE(_MEM, RES_LOW_LIMIT),
> -		.write_string = mem_cgroup_write,
> +		.write = mem_cgroup_write,
>  		.read_u64 = mem_cgroup_read_u64,
>  	},

Renaming buffer to buf was rather unneeded.

I have 24 patches here against mm/memcontrol.c.  Go gently, please.
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