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

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Date:   Wed, 17 Nov 2021 07:59:55 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Anders Roxell <anders.roxell@...aro.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, 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 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
>