Re: linux-next: build warning after merge of the akpm-current tree

From: Stephen Rothwell
Date: Thu Aug 01 2019 - 01:51:43 EST


Hi Miles,

On Wed, 31 Jul 2019 14:28:04 +0800 Miles Chen <miles.chen@xxxxxxxxxxxx> 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.

--
Cheers,
Stephen Rothwell

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