linux-kernel - Re: [PATCH 3/4] Constify struct kset_uevent

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Date:	Tue, 29 Dec 2009 22:51:33 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Emese Revfy <re.emese@...il.com>
Cc:	David Rientjes <rientjes@...gle.com>, linux-kernel@...r.kernel.org,
	cl@...ux-foundation.org, torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/4] Constify struct kset_uevent_ops for 
	2.6.32-git-053fe57ac v2

Hi Emese,

On Tue, Dec 29, 2009 at 10:50 PM, Emese Revfy <re.emese@...il.com> wrote:
> David Rientjes wrote:
>> On Sat, 26 Dec 2009, Emese Revfy wrote:
>>
>>>>> diff --git a/mm/slub.c b/mm/slub.c
>>>>> index 4996fc7..fb63aca 100644
>>>>> --- a/mm/slub.c
>>>>> +++ b/mm/slub.c
>>>>> @@ -4522,7 +4522,7 @@ static int uevent_filter(struct kset *kset, struct kobject *kobj)
>>>>>        return 0;
>>>>>  }
>>>>>
>>>>> -static struct kset_uevent_ops slab_uevent_ops = {
>>>>> +static const struct kset_uevent_ops slab_uevent_ops = {
>>>>>        .filter = uevent_filter,
>>>>>  };
>>>>   CC      mm/slub.o
>>>> mm/slub.c: In function 'slab_sysfs_init':
>>>> mm/slub.c:4679: warning: passing argument 2 of 'kset_create_and_add'
>>>> discards qualifiers from pointer target type
>>>> include/linux/kobject.h:164: note: expected 'struct kset_uevent_ops *'
>>>> but argument is of type 'const struct kset_uevent_ops *'
>>>>
>>>> Hmm?
>>>>
>>> I double checked both the declaration and definitions of the affected
>>> function/structure and they are consistently const here.
>>> Can you tell me what patch/tree combination you encountered this warning with?
>>> Thanks, Emese
>>>
>>
>> The warning emitted by gcc is pretty explicit; the second formal of
>> kset_create_and_add() takes a 'struct kset_uevent_ops *' type while you're
>> now passing 'const struct kset_uevent_ops *' as the result of your change.
>> That said, kset_create() could probably be modified with the const
>> qualifier, but that's outside the scope of your patchset and would have to
>> be proposed seperately.
>
> I see what you mean, this was part of [PATCH 1/4] that I forgot to CC to you.

Then you might as well fold everything in one patch and send it to
Andrew. I can't apply both in my tree and I don't want to apply
something that doesn't compile cleanly.

                         Pekka
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