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Date:   Thu, 1 Aug 2019 08:15:28 +0200
From:   Michal Hocko <mhocko@kernel.org>
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Miles Chen <miles.chen@mediatek.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Qian Cai <cai@lca.pw>
Subject: Re: linux-next: build warning after merge of the akpm-current tree
Message-ID: <20190801061527.GB11627@dhcp22.suse.cz>
References: <20190731161151.26ef081e@canb.auug.org.au>
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 <20190801155130.29a07b1b@canb.auug.org.au>
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On Thu 01-08-19 15:51:30, Stephen Rothwell wrote:
> Hi Miles,
> 
> On Wed, 31 Jul 2019 14:28:04 +0800 Miles Chen <miles.chen@mediatek.com> wrote:
> >
> > On Wed, 2019-07-31 at 16:11 +1000, Stephen Rothwell wrote:
> > > 
> > > After merging the akpm-current tree, today's linux-next build (powerpc
> > > ppc64_defconfig) produced this warning:
> > > 
> > > mm/memcontrol.c: In function 'invalidate_reclaim_iterators':
> > > mm/memcontrol.c:1160:11: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
> > >   } while (memcg = parent_mem_cgroup(memcg));
> > >            ^~~~~
> > >   
> > 
> > Hi Stephen,
> > 
> > Thanks for the telling me this. Sorry for the build warning. 
> > Should I send patch v5 to the mailing list to fix this? 
> 
> You might as well (cc'ing Andrew, of course).
> 
> I would suggest finishing that loop like this:
> 
> 		memcg = parent_mem_cgroup(memcg);
> 	} while (memcg);
> 
> rather than adding a set of parentheses.

Qian has already posted a patch http://lkml.kernel.org/r/1564580753-17531-1-git-send-email-cai@lca.pw
-- 
Michal Hocko
SUSE Labs