linux-kernel - Re: [PATCH] [17/23] EXT3: Fix set but unused variables

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Date:	Mon, 14 Jun 2010 13:27:18 -0400
From:	tytso@....edu
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-ext4@...r.kernel.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [17/23] EXT3: Fix set but unused variables

On Thu, Jun 10, 2010 at 01:10:53PM +0200, Andi Kleen wrote:
> Index: linux-2.6.35-rc2-gcc/fs/jbd/recovery.c
> ===================================================================
> --- linux-2.6.35-rc2-gcc.orig/fs/jbd/recovery.c
> +++ linux-2.6.35-rc2-gcc/fs/jbd/recovery.c
> @@ -283,12 +283,10 @@ int journal_recover(journal_t *journal)
>  int journal_skip_recovery(journal_t *journal)
>  {
>  	int			err;
> -	journal_superblock_t *	sb;
>  
>  	struct recovery_info	info;
>  
>  	memset (&info, 0, sizeof(info));
> -	sb = journal->j_superblock;

Oops, spoke too soon.  This will cause a compile error if
CONFIG_JBD_DEBUG is defined.

The following pesudo-patch is required:

 #ifdef CONFIG_JBD_DEBUG
-		int dropped = info.end_transaction - be32_to_cpu(sb->s_sequence);
+		int dropped = info.end_transaction - 
+				be32_to_cpu(journal->j_superblock->s_sequence);
 #endif

						- Ted

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