linux-kernel - Re: [PATCH] mm: Fix section mismatch in memcontrol.c

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Date:	Wed, 14 Jan 2009 15:49:12 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rakib Mullick <rakib.mullick@...il.com>,
	Linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	mingo@...e.hu, Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [PATCH] mm: Fix section mismatch in memcontrol.c

On Wed, 14 Jan 2009 13:14:54 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > On Wed, 14 Jan 2009 10:43:24 +0600
> > "Rakib Mullick" <rakib.mullick@...il.com> wrote:
> > 
> >> Sure. You can carryout your other jobs. Here is the patch.
> >> Thanks for your help guys.
> >>
> > Thank you. I confirmed this fixes mismatch.
> > 
> > Could you send this with your Signed-off-by, again ?
> > 
> > you got my Ack.
> > Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > 
> 
> No... This patch is still not correct..
> 
> It's mem_cgroup_create() but not enable_swap_cgroup() that needs
> to be marked as __init_refok.
> 
> Here is the correct one:
> 
Ah..maybe you're right.

BTW, reading inclinde/linux/init.h again

==
/* modpost check for section mismatches during the kernel build.
 * A section mismatch happens when there are references from a
 * code or data section to an init section (both code or data).
 * The init sections are (for most archs) discarded by the kernel
 * when early init has completed so all such references are potential bugs.
 * For exit sections the same issue exists.
 * The following markers are used for the cases where the reference to
 * the *init / *exit section (code or data) is valid and will teach
 * modpost not to issue a warning.
 * The markers follow same syntax rules as __init / __initdata. */
#define __ref            __section(.ref.text) noinline
#define __refdata        __section(.ref.data)
#define __refconst       __section(.ref.rodata)

==

It seems init_refok is old style.

Could you convert to __ref ?

-Kame



> ===============
> 
> From: Li Zefan <lizf@...fujitsu.com>
> Date: Wed, 14 Jan 2009 13:07:31 +0800
> Subject: [PATCH] memcg: fix section mismatch
> 
> At system boot when creating the top cgroup, mem_cgroup_create() calls
> enable_swap_cgroup() which is marked as __init, so mark mem_cgroup_create()
> as __init_refok to avoid false section mismatch warning.
> 
> Reported-by: Rakib Mullick <rakib.mullick@...il.com>
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> ---
>  mm/memcontrol.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e2996b8..a2c929f 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2181,7 +2181,7 @@ static void __init enable_swap_cgroup(void)
>  }
>  #endif
>  
> -static struct cgroup_subsys_state *
> +static struct cgroup_subsys_state * __init_refok
>  mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
>  {
>  	struct mem_cgroup *mem, *parent;
> -- 
> 1.5.4.rc3
> --
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