linux-kernel - Re: [PATCH] ARM: dove: fix returnvar.cocci warnings

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Date:   Tue, 3 May 2022 09:53:10 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Arnd Bergmann <arnd@...db.de>, kernel test robot <lkp@...el.com>,
        kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Russell King <linux@...linux.org.uk>,
        linux-omap <linux-omap@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dove: fix returnvar.cocci warnings

On Tue, May 3, 2022 at 9:30 AM Tony Lindgren <tony@...mide.com> wrote:
> * Arnd Bergmann <arnd@...db.de> [220503 07:18]:
> > On Tue, May 3, 2022 at 4:45 AM kernel test robot <lkp@...el.com> wrote:
> > >
> > > From: kernel test robot <lkp@...el.com>
> > >
> > > arch/arm/mach-omap2/dma.c:82:10-16: Unneeded variable: "errata". Return "0" on line 161
> > >
> > >
> > >  Remove unneeded variable used to store return value.
> > >
> > > Generated by: scripts/coccinelle/misc/returnvar.cocci
> > >
> > > Reported-by: kernel test robot <lkp@...el.com>
> > > Signed-off-by: kernel test robot <lkp@...el.com>
> >
> > I checked the patch, and unfortunately it is wrong, the current code
> > needs to stay.
> > The problem is the SET_DMA_ERRATA() macro that accesses the
> > local 'errata' variable.
>
> Yeah this one keeps popping up. Maybe we can make SET_DMA_ERRATA
> into a function or have it at least change it to set the errata
> value.

I would just remove the macro and open-code the assignment, which
I think makes it more readable to both people and tools.

     Arnd