linux-kernel - Re: [PATCH] slub: let need_slab_obj_exts() return false if SLAB_NO_OBJ

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Message-ID: <aYW732VZACRIzr-r@hyeyoo>
Date: Fri, 6 Feb 2026 19:01:03 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Hao Li <hao.li@...ux.dev>, akpm@...ux-foundation.org, cl@...two.org,
        rientjes@...gle.com, roman.gushchin@...ux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slub: let need_slab_obj_exts() return false if
 SLAB_NO_OBJ_EXT is set

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@...ux.dev>
> >> ---
> > 
> > Looks reasonable to me,
> > Acked-by: Harry Yoo <harry.yoo@...cle.com>
> 
> 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 :)

> But a correct thing to do.

-- 
Cheers,
Harry / Hyeonggon