Re: [PATCH] slub: let need_slab_obj_exts() return false if SLAB_NO_OBJ_EXT is set

[Vlastimil Babka]

On 2/6/26 11:01, Harry Yoo wrote:
> On Fri, Feb 06, 2026 at 10:40:54AM +0100, Vlastimil Babka wrote:
>> On 2/6/26 01:53, Harry Yoo wrote:
>> > On Thu, Feb 05, 2026 at 08:07:23PM +0800, Hao Li wrote:
>> >> SLAB_NO_OBJ_EXT is set for boot caches, but need_slab_obj_exts() doesn't
>> >> check this flag. We should return false unconditionally when
>> >> SLAB_NO_OBJ_EXT is set.
>> >> 
>> >> Signed-off-by: Hao Li <hao.li@xxxxxxxxx>
>> >> ---
>> > 
>> > Looks reasonable to me,
>> > Acked-by: Harry Yoo <harry.yoo@xxxxxxxxxx>
>> 
>> Thanks, added to slab/for-7.0/obj_metadata
>> I think it doesn't change anything at the moment?
> 
> ...unless you enable memory allocation profiling :)

If I do, would kmem_cache or kmem_cache_node caches gotten obj_exts in
leftover space?

>> But a correct thing to do.
>