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Re: [patch] xfs: remove an unneeded NULL check

To: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Subject: Re: [patch] xfs: remove an unneeded NULL check
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 1 Feb 2012 09:56:01 +1100
Cc: Ben Myers <bpm@xxxxxxx>, xfs-masters@xxxxxxxxxxx, Alex Elder <elder@xxxxxxxxxx>, kernel-janitors@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20120128105501.GB25092@xxxxxxxxxxxxxx>
References: <20120128105501.GB25092@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sat, Jan 28, 2012 at 01:55:01PM +0300, Dan Carpenter wrote:
> Smatch complains because we check "commit_lsn" for NULL inconsistently.
> fs/xfs/xfs_log_cil.c +705 xfs_log_commit_cil(43) error: we previously
>       assumed 'commit_lsn' could be null (see line 688)
> xfs_log_commit_cil() is only called from one place, and "commit_lsn" is
> a valid pointer, so I've removed the NULL check.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> 
> diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
> index d4fadbe..d9c4652 100644
> --- a/fs/xfs/xfs_log_cil.c
> +++ b/fs/xfs/xfs_log_cil.c
> @@ -685,8 +685,7 @@ xfs_log_commit_cil(
>  
>       /* lock out background commit */
>       down_read(&log->l_cilp->xc_ctx_lock);
> -     if (commit_lsn)
> -             *commit_lsn = log->l_cilp->xc_ctx->sequence;
> +     *commit_lsn = log->l_cilp->xc_ctx->sequence;
>  
>       xlog_cil_insert_items(log, log_vector, tp->t_ticket);

There's a set of reviewed patches (for 3.3) that change all this
code. The null check might still be there, but that needs to be
checked.

On that note, Ben, can you get all of the reviewed patches that are
currently outstanding into the for-next branch of the oss tree? We
need this done sooner rather than later so that all our current
testing during development is done with those patches applied. it
also helps us to avoid conflicts between patchsets that touch the
same code (which I have quite a few of at the moment)....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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