linux-kernel - Re: [PATCH 2/7] ipc: fix trivial warning

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Date:	Mon, 19 Oct 2009 16:12:38 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH 2/7] ipc: fix trivial warning

On Mon, 19 Oct 2009, Felipe Contreras wrote:

> Commit a0d092f introduced the following warning:
> ipc/msg.c: In function ?msgctl_down?:
> ipc/msg.c:415: warning: ?msqid64? may be used uninitialized in this function
> 
> Signed-off-by: Felipe Contreras <felipe.contreras@...il.com>
> ---
>  ipc/msg.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/ipc/msg.c b/ipc/msg.c
> index 2ceab7f..085bd58 100644
> --- a/ipc/msg.c
> +++ b/ipc/msg.c
> @@ -412,7 +412,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
>  		       struct msqid_ds __user *buf, int version)
>  {
>  	struct kern_ipc_perm *ipcp;
> -	struct msqid64_ds msqid64;
> +	struct msqid64_ds uninitialized_var(msqid64);
>  	struct msg_queue *msq;
>  	int err;

What gcc are you using? I am not getting any warning at least with gcc 
"(SUSE Linux) 4.3.1 20080507 (prerelease) [gcc-4_3-branch revision 
135036]"

$ make ipc/msg.o
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  SYMLINK include/asm -> include/asm-x86
  CALL    scripts/checksyscalls.sh
  CC      ipc/msg.o
$

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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