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Subject: Re: [RFC PATCH] coccinelle: misc: add uninitialized_var.cocci script
To:     Julia Lawall <julia.lawall@inria.fr>, Joe Perches <joe@perches.com>
Cc:     cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org,
        Kees Cook <keescook@chromium.org>,
        "Gustavo A . R . Silva" <gustavoars@kernel.org>
References: <20200811210127.11889-1-efremov@linux.com>
 <alpine.DEB.2.22.394.2008292133360.3629@hadrien>
 <489164b541e344f254b70429e4f6d467e1602931.camel@perches.com>
 <alpine.DEB.2.22.394.2008292146170.3629@hadrien>
From:   Denis Efremov <efremov@linux.com>
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Message-ID: <d7dcb9b4-4093-d0a3-5277-b50e212a5700@linux.com>
Date:   Sat, 29 Aug 2020 23:13:27 +0300
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On 8/29/20 10:48 PM, Julia Lawall wrote:
> 
> 
> On Sat, 29 Aug 2020, Joe Perches wrote:
> 
>> On Sat, 2020-08-29 at 21:36 +0200, Julia Lawall wrote:
>>>
>>> On Wed, 12 Aug 2020, Denis Efremov wrote:
>>>
>>>> Commit 63a0895d960a ("compiler: Remove uninitialized_var() macro") and
>>>> commit 4b19bec97c88 ("docs: deprecated.rst: Add uninitialized_var()")
>>>> removed uninitialized_var() and deprecated it.
>>>>
>>>> The purpose of this script is to prevent new occurrences of open-coded
>>>> variants of uninitialized_var().
>>
>>>> Cc: Kees Cook <keescook@chromium.org>
>>>> Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
>>>> Signed-off-by: Denis Efremov <efremov@linux.com>
>>>
>>> Applied, without the commented out part.
>>>
>>> I only got three warnings, though.  Perhaps the others have been fixed?
>>
>> uninitialized_var does not exist in -next

Yes, and this rule checks for not introducing these initializations once again.

i.e, checks for: 

int a = a;

int a = *(&a);

> 
> OK, if it seems better, I can remove it.  Out of the threee reported, one
> was a completely unnecessary initialization.
> 

I would like send v2 with better description and link to the documentation because it's
now available online:
https://www.kernel.org/doc/html/latest/process/deprecated.html#uninitialized-var

Thanks,
Denis