linux-kernel - Re: [PATCH -next] mm, compaction: remove set but not used variables 'a, b, c'

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Date:   Wed, 9 Jan 2019 10:15:51 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH -next] mm, compaction: remove set but not used variables
 'a, b, c'

On Wed, Jan 09, 2019 at 03:02:47AM +0000, YueHaibing wrote:
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> mm/compaction.c: In function 'compact_zone':
> mm/compaction.c:2063:22: warning:
>  variable 'c' set but not used [-Wunused-but-set-variable]
> mm/compaction.c:2063:19: warning:
>  variable 'b' set but not used [-Wunused-but-set-variable]
> mm/compaction.c:2063:16: warning:
>  variable 'a' set but not used [-Wunused-but-set-variable]
> 
> This never used since 94d5992baaa5 ("mm, compaction: finish pageblock
> scanning on contention")
> 

Dang. This is left-over debugging code that got accidentally merged
during a rebase.  Andrew, can you pick this up as a fix to the mmotm
patch mm-compaction-finish-pageblock-scanning-on-contention.patch please?

Thanks YueHaibing.

-- 
Mel Gorman
SUSE Labs