linux-kernel - Re: [PATCH] soc/tegra: fuse: fix bitwice vs. logical warning

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Date:   Wed, 17 Nov 2021 16:38:50 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     thierry.reding@...il.com, jonathanh@...dia.com,
        ndesaulniers@...gle.com, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] soc/tegra: fuse: fix bitwice vs. logical warning

On Wed, 17 Nov 2021 at 16:00, Nathan Chancellor <nathan@...nel.org> wrote:
>
> On Wed, Nov 17, 2021 at 03:21:15PM +0100, Anders Roxell wrote:
> > When building with clang-13 the compiler warns about:
> >
> > drivers/soc/tegra/fuse/speedo-tegra20.c:72:9: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
> >                 reg = tegra_fuse_read_spare(i) |
> >                       ^~~~~~~~~~~~~~~~~~~~~~~~~~
> >                                                ||
> >
> > This should be a logical OR so change it to fix the warning.
> >
> > Fixes: 7e939de1b2bb ("soc/tegra: fuse: Unify Tegra20 and Tegra30 drivers")
> > Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
>
> I sent the same patch a couple of weeks ago (but it was right before the
> merge window so I am sure nobody was really paying attention):
>
> https://lore.kernel.org/r/20211021214500.2388146-1-nathan@kernel.org/
>
> I do not particularly care which one gets merged (although I think mine
> explains the warning a little bit better).

I missed that, sorry.
I agree I think your changlog explains the warning better.

Cheers,
Anders

>
> I am not sure your fixes tag is right, I would expect it to be:
>
> Fixes: 25cd5a391478 ("ARM: tegra: Add speedo-based process identification")
>
> With that fixed:
>
> Reviewed-by: Nathan Chancellor <nathan@...nel.org>
>
> > ---
> >  drivers/soc/tegra/fuse/speedo-tegra20.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/soc/tegra/fuse/speedo-tegra20.c b/drivers/soc/tegra/fuse/speedo-tegra20.c
> > index 2546bddbab93..4984246605ae 100644
> > --- a/drivers/soc/tegra/fuse/speedo-tegra20.c
> > +++ b/drivers/soc/tegra/fuse/speedo-tegra20.c
> > @@ -69,7 +69,7 @@ void __init tegra20_init_speedo_data(struct tegra_sku_info *sku_info)
> >
> >       val = 0;
> >       for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) {
> > -             reg = tegra_fuse_read_spare(i) |
> > +             reg = tegra_fuse_read_spare(i) ||
> >                       tegra_fuse_read_spare(i + CPU_SPEEDO_REDUND_OFFS);
> >               val = (val << 1) | (reg & 0x1);
> >       }
> > @@ -84,7 +84,7 @@ void __init tegra20_init_speedo_data(struct tegra_sku_info *sku_info)
> >
> >       val = 0;
> >       for (i = SOC_SPEEDO_MSBIT; i >= SOC_SPEEDO_LSBIT; i--) {
> > -             reg = tegra_fuse_read_spare(i) |
> > +             reg = tegra_fuse_read_spare(i) ||
> >                       tegra_fuse_read_spare(i + SOC_SPEEDO_REDUND_OFFS);
> >               val = (val << 1) | (reg & 0x1);
> >       }
> > --
> > 2.33.0
> >