linux-kernel - Re: [PATCH v2 01/21] mm/slab, docs: switch mm-api docs generation from slab.c to slub.c

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Message-ID: <ZW6ez8IvvS9ojnZx@localhost.localdomain>
Date:   Tue, 5 Dec 2023 12:53:51 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     David Rientjes <rientjes@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marco Elver <elver@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        cgroups@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 01/21] mm/slab, docs: switch mm-api docs generation
 from slab.c to slub.c

On Mon, Nov 20, 2023 at 07:34:12PM +0100, Vlastimil Babka wrote:
> The SLAB implementation is going to be removed, and mm-api.rst currently
> uses mm/slab.c to obtain kerneldocs for some API functions. Switch it to
> mm/slub.c and move the relevant kerneldocs of exported functions from
> one to the other. The rest of kerneldocs in slab.c is for static SLAB
> implementation-specific functions that don't have counterparts in slub.c
> and thus can be simply removed with the implementation.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---
>  Documentation/core-api/mm-api.rst |  2 +-
>  mm/slab.c                         | 21 ---------------------
>  mm/slub.c                         | 21 +++++++++++++++++++++
>  3 files changed, 22 insertions(+), 22 deletions(-)
> 
> diff --git a/Documentation/core-api/mm-api.rst b/Documentation/core-api/mm-api.rst
> index 2d091c873d1e..af8151db88b2 100644
> --- a/Documentation/core-api/mm-api.rst
> +++ b/Documentation/core-api/mm-api.rst
> @@ -37,7 +37,7 @@ The Slab Cache
>  .. kernel-doc:: include/linux/slab.h
>     :internal:
>  
> -.. kernel-doc:: mm/slab.c
> +.. kernel-doc:: mm/slub.c
>     :export:
>  
>  .. kernel-doc:: mm/slab_common.c
> diff --git a/mm/slab.c b/mm/slab.c
> index 9ad3d0f2d1a5..37efe3241f9c 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -3491,19 +3491,6 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
>  }
>  EXPORT_SYMBOL(kmem_cache_alloc_bulk);
>  
> -/**
> - * kmem_cache_alloc_node - Allocate an object on the specified node
> - * @cachep: The cache to allocate from.
> - * @flags: See kmalloc().
> - * @nodeid: node number of the target node.
> - *
> - * Identical to kmem_cache_alloc but it will allocate memory on the given
> - * node, which can improve the performance for cpu bound structures.
> - *
> - * Fallback to other node is possible if __GFP_THISNODE is not set.
> - *
> - * Return: pointer to the new object or %NULL in case of error
> - */
>  void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
>  {
>  	void *ret = slab_alloc_node(cachep, NULL, flags, nodeid, cachep->object_size, _RET_IP_);
> @@ -3564,14 +3551,6 @@ void __kmem_cache_free(struct kmem_cache *cachep, void *objp,
>  	__do_kmem_cache_free(cachep, objp, caller);
>  }
>  
> -/**
> - * kmem_cache_free - Deallocate an object
> - * @cachep: The cache the allocation was from.
> - * @objp: The previously allocated object.
> - *
> - * Free an object which was previously allocated from this
> - * cache.
> - */
>  void kmem_cache_free(struct kmem_cache *cachep, void *objp)
>  {
>  	cachep = cache_from_obj(cachep, objp);
> diff --git a/mm/slub.c b/mm/slub.c
> index 63d281dfacdb..3e01731783df 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -3518,6 +3518,19 @@ void *__kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags,
>  			       caller, orig_size);
>  }
>  
> +/**
> + * kmem_cache_alloc_node - Allocate an object on the specified node
> + * @s: The cache to allocate from.
> + * @gfpflags: See kmalloc().
> + * @node: node number of the target node.
> + *
> + * Identical to kmem_cache_alloc but it will allocate memory on the given
> + * node, which can improve the performance for cpu bound structures.
> + *
> + * Fallback to other node is possible if __GFP_THISNODE is not set.
> + *
> + * Return: pointer to the new object or %NULL in case of error
> + */
>  void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
>  {
>  	void *ret = slab_alloc_node(s, NULL, gfpflags, node, _RET_IP_, s->object_size);
> @@ -3822,6 +3835,14 @@ void __kmem_cache_free(struct kmem_cache *s, void *x, unsigned long caller)
>  	slab_free(s, virt_to_slab(x), x, NULL, &x, 1, caller);
>  }
>  
> +/**
> + * kmem_cache_free - Deallocate an object
> + * @s: The cache the allocation was from.
> + * @x: The previously allocated object.
> + *
> + * Free an object which was previously allocated from this
> + * cache.
> + */
>  void kmem_cache_free(struct kmem_cache *s, void *x)
>  {
>  	s = cache_from_obj(s, x);
> 

Looks good to me,
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

> -- 
> 2.42.1
> 
>