linux-kernel - Re: [PATCH] clk: remove unneeded dead-store initialization

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Message-ID: <160538595432.60232.9813667976586248163@swboyd.mtv.corp.google.com>
Date:   Sat, 14 Nov 2020 12:32:34 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org
Cc:     Tom Rix <trix@...hat.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-janitors@...r.kernel.org, linux-safety@...ts.elisa.tech,
        linux-kernel@...r.kernel.org,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: Re: [PATCH] clk: remove unneeded dead-store initialization

Quoting Lukas Bulwahn (2020-11-06 01:48:20)
> make clang-analyzer on x86_64 defconfig caught my attention with:
> 
>   drivers/clk/clk.c:423:19:
>   warning: Value stored to 'parent' during its initialization is never read
>   [clang-analyzer-deadcode.DeadStores]
>           struct clk_core *parent = ERR_PTR(-ENOENT);
>                            ^
> 
> Commit fc0c209c147f ("clk: Allow parents to be specified without string
> names") introduced clk_core_fill_parent_index() with this unneeded
> dead-store initialization.
> 
> So, simply remove this unneeded dead-store initialization to make
> clang-analyzer happy.
> 
> As compilers will detect this unneeded assignment and optimize this anyway,
> the resulting object code is identical before and after this change.
> 
> No functional change. No change to object code.
> 
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> ---

Applied to clk-next