linux-kernel - Re: [PATCH] btrfs: fix build warning

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Message-ID: <20160322095941.GG8095@twin.jikos.cz>
Date:	Tue, 22 Mar 2016 10:59:41 +0100
From:	David Sterba <dsterba@...e.cz>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	David Sterba <dsterba@...e.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>
Subject: Re: [PATCH] btrfs: fix build warning

On Tue, Mar 22, 2016 at 10:39:59AM +0100, Geert Uytterhoeven wrote:
> On Tue, Feb 16, 2016 at 9:02 AM, Sudip Mukherjee
> <sudipm.mukherjee@...il.com> wrote:
> > We were getting build warning about:
> > fs/btrfs/extent-tree.c:7021:34: warning: ‘used_bg’ may be used
> >         uninitialized in this function
> >
> > It is not a valid warning as used_bg is never used uninitilized since
> > locked is initially false so we can never be in the section where
> > 'used_bg' is used. But gcc is not able to understand that and we can
> > initialize it while declaring to silence the warning.
> >
> > Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> 
> FWIW, I've posted an alternative patch that killed the silly locked variable
> a while ago.
> "[PATCH] Btrfs: Refactor btrfs_lock_cluster() to kill compiler warning"
> https://lkml.org/lkml/2014/6/22/96

The cleanup looks great, thanks, patch picked.