linux-kernel - Re: [PATCH] MIPS: Use address-of operator on section symbols

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Message-ID: <8e7a7861-197f-e6ae-7a6d-b4e850ab5b09@gmail.com>
Date:   Tue, 5 Jan 2021 12:23:08 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     John Crispin <john@...ozen.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] MIPS: Use address-of operator on section symbols

On 1/5/21 12:18 PM, Nathan Chancellor wrote:
> When building xway_defconfig with clang:
> 
> arch/mips/lantiq/prom.c:82:23: error: array comparison always evaluates
> to true [-Werror,-Wtautological-compare]
>         else if (__dtb_start != __dtb_end)
>                              ^
> 1 error generated.
> 
> These are not true arrays, they are linker defined symbols, which are
> just addresses. Using the address of operator silences the warning
> and does not change the resulting assembly with either clang/ld.lld
> or gcc/ld (tested with diff + objdump -Dr). Do the same thing across
> the entire MIPS subsystem to ensure there are no more warnings around
> this type of comparison.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/1232
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian