linux-kernel - Re: linux-next: build warning after merge of the xfs tree

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Date:   Tue, 26 Jan 2021 19:14:35 -0800
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Brian Foster <bfoster@...hat.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        David Chinner <david@...morbit.com>, linux-xfs@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the xfs tree

On Mon, Jan 25, 2021 at 08:26:16AM -0500, Brian Foster wrote:
> On Mon, Jan 25, 2021 at 09:55:32AM +1100, Stephen Rothwell wrote:
> > Hi all,
> > 
> > After merging the xfs tree, today's linux-next build (powerpc
> > ppc64_defconfig) produced this warning:
> > 
> > fs/xfs/xfs_log.c: In function 'xfs_log_cover':
> > fs/xfs/xfs_log.c:1111:16: warning: unused variable 'log' [-Wunused-variable]
> >  1111 |  struct xlog  *log = mp->m_log;
> >       |                ^~~
> > 
> > Introduced by commit
> > 
> >   303591a0a947 ("xfs: cover the log during log quiesce")
> > 
> 
> Oops, patch below. Feel free to apply or squash into the original
> commit.
> 
> Brian
> 
> --- 8< ---
> 
> From 6078f06e2bd4c82111a85a2032c39a56654b0be6 Mon Sep 17 00:00:00 2001
> From: Brian Foster <bfoster@...hat.com>
> Date: Mon, 25 Jan 2021 08:22:56 -0500
> Subject: [PATCH] xfs: fix unused log variable in xfs_log_cover()
> 
> The log variable is only used in kernels with asserts enabled.
> Remove it and open code the dereference to avoid unused variable
> warnings.
> 
> Signed-off-by: Brian Foster <bfoster@...hat.com>

Looks ok to me...
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/xfs/xfs_log.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
> index 58699881c100..d8b814227734 100644
> --- a/fs/xfs/xfs_log.c
> +++ b/fs/xfs/xfs_log.c
> @@ -1108,12 +1108,11 @@ static int
>  xfs_log_cover(
>  	struct xfs_mount	*mp)
>  {
> -	struct xlog		*log = mp->m_log;
>  	int			error = 0;
>  	bool			need_covered;
>  
> -	ASSERT((xlog_cil_empty(log) && xlog_iclogs_empty(log) &&
> -	        !xfs_ail_min_lsn(log->l_ailp)) ||
> +	ASSERT((xlog_cil_empty(mp->m_log) && xlog_iclogs_empty(mp->m_log) &&
> +	        !xfs_ail_min_lsn(mp->m_log->l_ailp)) ||
>  	       XFS_FORCED_SHUTDOWN(mp));
>  
>  	if (!xfs_log_writable(mp))
> -- 
> 2.26.2
>