linux-kernel - Re: [PATCH] net: tc35815: Explicitly check NET_IP_ALIGN is not zero in tc35815

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Message-Id: <20190811.214215.1211940529349794121.davem@davemloft.net>
Date:   Sun, 11 Aug 2019 21:42:15 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     natechancellor@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] net: tc35815: Explicitly check NET_IP_ALIGN is not
 zero in tc35815_rx

From: Nathan Chancellor <natechancellor@...il.com>
Date: Sun, 11 Aug 2019 20:13:45 -0700

> clang warns:
> 
> drivers/net/ethernet/toshiba/tc35815.c:1507:30: warning: use of logical
> '&&' with constant operand [-Wconstant-logical-operand]
>                         if (!HAVE_DMA_RXALIGN(lp) && NET_IP_ALIGN)
>                                                   ^  ~~~~~~~~~~~~
> drivers/net/ethernet/toshiba/tc35815.c:1507:30: note: use '&' for a
> bitwise operation
>                         if (!HAVE_DMA_RXALIGN(lp) && NET_IP_ALIGN)
>                                                   ^~
>                                                   &
> drivers/net/ethernet/toshiba/tc35815.c:1507:30: note: remove constant to
> silence this warning
>                         if (!HAVE_DMA_RXALIGN(lp) && NET_IP_ALIGN)
>                                                  ~^~~~~~~~~~~~~~~
> 1 warning generated.
> 
> Explicitly check that NET_IP_ALIGN is not zero, which matches how this
> is checked in other parts of the tree. Because NET_IP_ALIGN is a build
> time constant, this check will be constant folded away during
> optimization.
> 
> Fixes: 82a9928db560 ("tc35815: Enable StripCRC feature")
> Link: https://github.com/ClangBuiltLinux/linux/issues/608
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Applied but I think clang is being rediculous.