linux-kernel - Re: [PATCH V6 8/9] mm/slab: move [__]ksize and slab

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Message-ID: <26d09b99-98fd-461e-bbdd-138fb37948e4@suse.cz>
Date: Tue, 13 Jan 2026 14:45:11 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Harry Yoo <harry.yoo@...cle.com>
Cc: akpm@...ux-foundation.org, andreyknvl@...il.com, cl@...two.org,
 dvyukov@...gle.com, glider@...gle.com, hannes@...xchg.org,
 linux-mm@...ck.org, mhocko@...nel.org, muchun.song@...ux.dev,
 rientjes@...gle.com, roman.gushchin@...ux.dev, ryabinin.a.a@...il.com,
 shakeel.butt@...ux.dev, surenb@...gle.com, vincenzo.frascino@....com,
 yeoreum.yun@....com, tytso@....edu, adilger.kernel@...ger.ca,
 linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org, hao.li@...ux.dev
Subject: Re: [PATCH V6 8/9] mm/slab: move [__]ksize and slab_ksize() to
 mm/slub.c

On 1/13/26 2:05 PM, Harry Yoo wrote:
> On Tue, Jan 13, 2026 at 01:44:45PM +0100, Vlastimil Babka wrote:
>>>  
>>> -/**
>>> - * __ksize -- Report full size of underlying allocation
>>> - * @object: pointer to the object
>>> - *
>>> - * This should only be used internally to query the true size of allocations.
>>> - * It is not meant to be a way to discover the usable size of an allocation
>>> - * after the fact. Instead, use kmalloc_size_roundup(). Using memory beyond
>>> - * the originally requested allocation size may trigger KASAN, UBSAN_BOUNDS,
>>> - * and/or FORTIFY_SOURCE.
>>> - *
>>> - * Return: size of the actual memory used by @object in bytes
>>> - */
>>> -size_t __ksize(const void *object)
>>
>> Think it could be also static and not in slab.h? I'll make that change
>> locally.
> 
> Uh, great. Thanks!
> 
> By the way `size_t __ksize(const void *objp);` is in both
> include/linux/slab.h and mm/slab.h.

Ack. Also moving the kerneldoc to ksize() as it should have been there
anyway.