linux-kernel - Re: [PATCH] tree wide: Use kvfree() than conditional kfree()/vfree()

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Date:	Sun, 8 Nov 2015 22:11:31 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:	Julia Lawall <julia@...u.dk>, Joe Perches <joe@...ches.com>,
	mhocko@...nel.org, linux-mm@...ck.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tree wide: Use kvfree() than conditional kfree()/vfree()

On Sun, Nov 8, 2015 at 7:04 AM, Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> wrote:
> Andy Shevchenko wrote:
>> Like Joe noticed you have left few places like
>> void my_func_kvfree(arg)
>> {
>> kvfree(arg);
>> }
>>
>> Might make sense to remove them completely, especially in case when
>> you have changed the callers.
>
> I think we should stop at
>
> #define my_func_kvfree(arg) kvfree(arg)

I don't think it's a good idea.

>
> in case someone want to add some code in future.

…then leave them to decide what to do, no? Trying to hunt the problem
which rather will not happen.

>
> Also, we might want to add a helper that does vmalloc() when
> kmalloc() failed because locations that do
>
>   ptr = kmalloc(size, GFP_NOFS);
>   if (!ptr)
>       ptr = vmalloc(size); /* Wrong because GFP_KERNEL is used implicitly */
>
> are found.

Another patch like Sergey suggested.

>
>> One more thought. Might be good to provide a coccinelle script for
>> such places? Julia?
>
> Welcome. I'm sure I'm missing some locations.



-- 
With Best Regards,
Andy Shevchenko
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