linux-kernel - Re: [PATCH 2/3] mm, slab: use an enum to define SLAB

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Date: Wed, 21 Feb 2024 23:19:43 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>,
 David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Hyeonggon Yoo <42.hyeyoo@...il.com>, 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>
Cc: Zheng Yejian <zhengyejian1@...wei.com>,
 Xiongwei Song <xiongwei.song@...driver.com>,
 Chengming Zhou <chengming.zhou@...ux.dev>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com
Subject: Re: [PATCH 2/3] mm, slab: use an enum to define SLAB_ cache creation
 flags

On 2/20/24 17:58, Vlastimil Babka wrote:
> @@ -156,9 +195,9 @@
>  /* The following flags affect the page allocator grouping pages by mobility */
>  /* Objects are reclaimable */
>  #ifndef CONFIG_SLUB_TINY
> -#define SLAB_RECLAIM_ACCOUNT ((slab_flags_t __force)0x00020000U)
> +#define SLAB_RECLAIM_ACCOUNT __SF_BIT(_SLAB_RECLAIM_ACCOUNT)
>  #else
> -#define SLAB_RECLAIM_ACCOUNT ((slab_flags_t __force)0)
> +#define SLAB_RECLAIM_ACCOUNT 0

lkp/sparse tells me this was the wrong way to unify all noop-due-to-config
flags [1,2]

so in v2 I'll unify all those to
((slab_flags_t __force)0U)

also the deprecated SLAB_MEM_SPREAD in patch 1

[1] https://lore.kernel.org/all/202402212310.KPtSDrRy-lkp@intel.com/
[2] https://lore.kernel.org/all/202402211803.Lmf1ANXx-lkp@intel.com/


>  #endif
>  #define SLAB_TEMPORARY		SLAB_RECLAIM_ACCOUNT	/* Objects are short-lived */