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Re: [PATCH] XFS: Fix gcc 4.6 set but not read and unused statement warni

To: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH] XFS: Fix gcc 4.6 set but not read and unused statement warnings v2
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 14 Jun 2010 14:48:04 +0200
Cc: Christoph Hellwig <hch@xxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, dgc@xxxxxxxxxxxxx
In-reply-to: <4C15EF75.5080909@xxxxxxxxxxxxxxx>
References: <20100614081356.GA27499@xxxxxxxxxxxxxxx> <20100614083021.GA29354@xxxxxx> <4C15EF75.5080909@xxxxxxxxxxxxxxx>
User-agent: Mutt/1.3.28i
On Mon, Jun 14, 2010 at 10:59:33AM +0200, Andi Kleen wrote:
> >How can this work?  bp->data is a void pointer.
> 
> It compiled with CONFIG_XFS_DEBUG enabled. Do I need to set some other
> option to test this?

It fails for me in a normal CONFIG_XFS_DEBUG build:

fs/xfs/xfs_da_btree.c: In function 'xfs_da_root_join':
fs/xfs/xfs_da_btree.c:737: warning: dereferencing 'void *' pointer
fs/xfs/xfs_da_btree.c:737: error: request for member 'magic' in
something not a structure or union
fs/xfs/xfs_da_btree.c:737: warning: dereferencing 'void *' pointer

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