linux-kernel - Re: block/bsg.c

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Date:	Mon, 16 Jul 2007 20:03:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: block/bsg.c

On Mon, 16 Jul 2007 21:47:21 -0400 Jeff Garzik <jeff@...zik.org> wrote:

> hrm.  uninitialized_var(x) does not silence the warning, on my compiler:
> 
> [jgarzik@...tzel misc-2.6]$ rpm -q gcc
> gcc-4.1.2-13.fc6
> 
> @@ -1358,6 +1358,8 @@ udf_load_partition(struct super_block *sb, kernel_lb_addr
>             	{
>             		kernel_lb_addr ino;
> + 			uninitialized_var(ino.partitionReferenceNum);
> +
>                	if (!UDF_SB_LASTBLOCK(sb))

[erk, wordwrapping!]

> still yields
> 
> fs/udf/super.c: In function ‘udf_fill_super’:
> fs/udf/super.c:1359: warning: ‘ino.partitionReferenceNum’ may be used 
> uninitialized in this function
> 

We use it as

-	int foo;
+	int uninitialized_var(foo);

so what you have is effectively


		kernel_lb_addr ino;

		ino.partitionReferenceNum = ino.partitionReferenceNum;


so it still warns.



Hopefully this will work:

		kernel_lb_addr uninitialized_var(ino);

	
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