linux-kernel - Re: [PATCH] xfs: Add missing braces around xfs_scrub_agfl

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Date:   Thu, 1 Feb 2018 09:08:26 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xfs: Add missing braces around xfs_scrub_agfl_info
 initializer

On Thu, Feb 01, 2018 at 12:31:36PM +0100, Arnd Bergmann wrote:
> On Thu, Feb 1, 2018 at 11:23 AM, Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
> > With gcc-4.1.2:
> >
> >     fs/xfs/scrub/agheader.c: In function ‘xfs_scrub_agfl’:
> >     fs/xfs/scrub/agheader.c:770: warning: missing braces around initializer
> >     fs/xfs/scrub/agheader.c:770: warning: (near initialization for ‘sai.oinfo’)
> >
> > The first member of struct xfs_scrub_agfl_info is no longer an integral
> > type, but a struct.  Add the missing curly braces to fix this.
> 
> I suspect gcc-4.5 is affected as well, but not 4.6+
> 
> > --- a/fs/xfs/scrub/agheader.c
> > +++ b/fs/xfs/scrub/agheader.c
> > @@ -767,7 +767,7 @@ int
> >  xfs_scrub_agfl(
> >         struct xfs_scrub_context        *sc)
> >  {
> > -       struct xfs_scrub_agfl_info      sai = { 0 };
> > +       struct xfs_scrub_agfl_info      sai = { { 0 } };
> >         struct xfs_agf                  *agf;
> 
> Looks ok to me, but
> 
>         struct xfs_scrub_agfl_info      sai = { };
> 
> might be slightly better in case the first member changes again.

Frankly I'd rather see it changed to memset(&sai, 0, sizeof(sai)); and
stop having to field all these gcc warnings that vary depending on
compiler version...

--D

> 
>      Arnd
> --
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