Received-SPF: pass (google.com: domain of linux-ext4+bounces-1385-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Message-ID: <dd9abbd7-56af-4654-83ae-741d41493f5c@linux.dev>
Date: Mon, 26 Feb 2024 12:22:04 +0800
Precedence: bulk
MIME-Version: 1.0
Subject: Re: [PATCH] ext4: remove SLAB_MEM_SPREAD flag usage
Content-Language: en-US
To: tytso@mit.edu, adilger.kernel@dilger.ca
Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, vbabka@suse.cz,
 roman.gushchin@linux.dev, Xiongwei.Song@windriver.com
References: <20240224134822.829456-1-chengming.zhou@linux.dev>
From: Chengming Zhou <chengming.zhou@linux.dev>
In-Reply-To: <20240224134822.829456-1-chengming.zhou@linux.dev>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

On 2024/2/24 21:48, chengming.zhou@linux.dev wrote:
> From: Chengming Zhou <zhouchengming@bytedance.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 to avoid confusion for users.
Here we can just remove all its users, which has no functional change.

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

Thanks!

> 
> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
> ---
>  fs/ext4/super.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index eb689fb85ce9..9a744f22aa24 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1500,8 +1500,7 @@ static int __init init_inodecache(void)
>  {
>  	ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
>  				sizeof(struct ext4_inode_info), 0,
> -				(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
> -					SLAB_ACCOUNT),
> +				SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
>  				offsetof(struct ext4_inode_info, i_data),
>  				sizeof_field(struct ext4_inode_info, i_data),
>  				init_once);