On 01/30/2015 02:12 AM, Andrew Morton wrote:
> On Thu, 29 Jan 2015 18:11:48 +0300 Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx> wrote:
>
>> virt_to_obj takes kmem_cache address, address of slab page,
>> address x pointing somewhere inside slab object,
>> and returns address of the begging of object.
>
> "beginning"
>
> The above text may as well be placed into slub_def.h as a comment.
>
Ok.
>> Signed-off-by: Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx>
>> Acked-by: Christoph Lameter <cl@xxxxxxxxx>
>> ---
>> include/linux/slub_def.h | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
>> index 9abf04e..eca3883 100644
>> --- a/include/linux/slub_def.h
>> +++ b/include/linux/slub_def.h
>> @@ -110,4 +110,9 @@ static inline void sysfs_slab_remove(struct kmem_cache *s)
>> }
>> #endif
>>
>> +static inline void *virt_to_obj(struct kmem_cache *s, void *slab_page, void *x)
>> +{
>> + return x - ((x - slab_page) % s->size);
>> +}
>
> "const void *x" would be better.
>
Yep.
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