linux-kernel - Re: [PATCH] erofs: remove SLAB_MEM

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Date: Mon, 26 Feb 2024 16:57:31 +0800
From: Chengming Zhou <chengming.zhou@...ux.dev>
To: xiang@...nel.org, chao@...nel.org, huyue2@...lpad.com,
 jefflexu@...ux.alibaba.com
Cc: linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
 vbabka@...e.cz, Xiongwei.Song@...driver.com
Subject: Re: [PATCH] erofs: remove SLAB_MEM_SPREAD flag usage

On 2024/2/24 21:47, chengming.zhou@...ux.dev wrote:
> From: Chengming Zhou <zhouchengming@...edance.com>
> 
> The SLAB_MEM_SPREAD flag is already a no-op as of 6.8-rc1, remove
> its usage so we can delete it from slab. No functional change.

Update changelog to make it clearer:

The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
removed as of v6.8-rc1, so it became a dead flag since the commit
16a1d968358a ("mm/slab: remove mm/slab.c and slab_def.h"). And the
series[1] went on to mark it obsolete explicitly to avoid confusion
for users. Here we can just remove all its users, which has no any
functional change.

[1] https://lore.kernel.org/all/20240223-slab-cleanup-flags-v2-1-02f1753e8303@suse.cz/

Thanks!

> 
> Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
> ---
>  fs/erofs/super.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/erofs/super.c b/fs/erofs/super.c
> index 9b4b66dcdd4f..8b6bf9ae1a59 100644
> --- a/fs/erofs/super.c
> +++ b/fs/erofs/super.c
> @@ -885,7 +885,7 @@ static int __init erofs_module_init(void)
>  
>  	erofs_inode_cachep = kmem_cache_create("erofs_inode",
>  			sizeof(struct erofs_inode), 0,
> -			SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT,
> +			SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
>  			erofs_inode_init_once);
>  	if (!erofs_inode_cachep)
>  		return -ENOMEM;