linux-kernel - Re: [PATCH] checkpatch: Include GEM_BUG_xxx variant in the excluded check list

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Date:   Thu, 15 Jun 2023 17:28:03 +0200
From:   David Hildenbrand <david@...hat.com>
To:     "Ruhl, Michael J" <michael.j.ruhl@...el.com>,
        Joe Perches <joe@...ches.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "apw@...onical.com" <apw@...onical.com>,
        "dwaipayanray1@...il.com" <dwaipayanray1@...il.com>,
        "lukas.bulwahn@...il.com" <lukas.bulwahn@...il.com>,
        "corbet@....net" <corbet@....net>
Subject: Re: [PATCH] checkpatch: Include GEM_BUG_xxx variant in the excluded
 check list

On 15.06.23 17:04, Ruhl, Michael J wrote:
>> -----Original Message-----
>> From: Joe Perches <joe@...ches.com>
>> Sent: Wednesday, June 14, 2023 9:47 PM
>> To: Ruhl, Michael J <michael.j.ruhl@...el.com>; linux-kernel@...r.kernel.org;
>> apw@...onical.com; dwaipayanray1@...il.com; lukas.bulwahn@...il.com;
>> corbet@....net; david@...hat.com
>> Subject: Re: [PATCH] checkpatch: Include GEM_BUG_xxx variant in the
>> excluded check list
>>
>> On Wed, 2023-06-14 at 12:49 -0400, Michael J. Ruhl wrote:
>>> GEM_BUG_ON is usually compiled as WARN.  You have to change to
>>> debug configuration to get this to be BUG.
>>>
>>> checkpatch flags this a WARN level issue.
>>>
>>> Since this is a i915 local debug macro, allow its use in checkpatch.pl.
>>>
>>> Fixes: 69d517e6e210 ("checkpatch: warn on usage of VM_BUG_ON() and
>> other BUG variants")
>>
>> Not a "Fixes", just an additional check
> 

That was discussed when developing that patch:

https://lore.kernel.org/linux-mm/87tu5vflld.fsf@intel.com/T/

GEM_BUG_ON(
-> Bad with CONFIG_DRM_I915_DEBUG_GEM_ONCE

Just like VM_BUG_ON or CI_BUG_ON... that BUGs only with another kernel 
config on.

So this is expected.

-- 
Cheers,

David / dhildenb