linux-kernel - Re: [PATCH] Fix to return wrong pointer in slob

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Message-ID: <44c63dc40805191932t6a386cb7r389b6e5d3d3bf095@mail.gmail.com>
Date:	Tue, 20 May 2008 11:32:19 +0900
From:	"MinChan Kim" <barrioskmc@...il.com>
To:	"Matt Mackall" <mpm@...enic.com>
Cc:	"MinChan Kim" <minchan.kim@...il.com>,
	linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	"Pekka J Enberg" <penberg@...helsinki.fi>
Subject: Re: [PATCH] Fix to return wrong pointer in slob

On Tue, May 20, 2008 at 2:40 AM, Matt Mackall <mpm@...enic.com> wrote:
>
> On Mon, 2008-05-19 at 22:12 +0900, MinChan Kim wrote:
>> Although slob_alloc return NULL, __kmalloc_node returns NULL + align.
>> Because align always can be changed, it is very hard for debugging
>> problem of no page if it don't return NULL.
>>
>> We have to return NULL in case of no page.
>>
>> Signed-off-by: MinChan Kim <minchan.kim@...il.com>
>> ---
>>  mm/slob.c |    9 ++++++---
>>  1 files changed, 6 insertions(+), 3 deletions(-)
>>
>> diff --git a/mm/slob.c b/mm/slob.c
>> index 6038cba..258d76d 100644
>> --- a/mm/slob.c
>> +++ b/mm/slob.c
>> @@ -469,9 +469,12 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
>>                       return ZERO_SIZE_PTR;
>>
>>               m = slob_alloc(size + align, gfp, align, node);
>> -             if (m)
>> -                     *m = size;
>> -             return (void *)m + align;
>> +             if (!m)
>> +                     return NULL;
>> +             else {
>> +                     *m = size;
>> +                     return (void *)m + align;
>> +             }
>
> This looks good, but I would remove the 'else {' and '}' here. It's nice
> to have the 'normal path' minimally indented.

I agree
Thanks, Matt :)


-- 
Thanks,
MinChan Kim
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