linux-kernel - Re: [PATCH] checkpatch: Warn on self-assignments

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Message-ID: <202009101250.FBB416D@keescook>
Date:   Thu, 10 Sep 2020 12:51:08 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, cocci@...teme.lip6.fr,
        linux-kernel@...r.kernel.org,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Denis Efremov <efremov@...ux.com>, julia.lawall@...ia.fr
Subject: Re: [PATCH] checkpatch: Warn on self-assignments

On Sat, Sep 05, 2020 at 10:58:29AM -0700, Joe Perches wrote:
> The uninitialized_var() macro was removed recently via
> commit 63a0895d960a ("compiler: Remove uninitialized_var() macro")
> as it's not a particularly useful warning and its use can
> "paper over real bugs".
> 
> Add a checkpatch test to warn on self-assignments as a means
> to avoid compiler warnings and as a back-door mechanism to
> reproduce the old uninitialized_var macro behavior.
> 
> Signed-off-by: Joe Perches <joe@...ches.com>

I like it! :)

Can you add a section to code style and include a link in the checkpatch
warning to it? (Feel free to just reuse the text removed from
deprecated.rst)

-- 
Kees Cook