Re: [PATCH] btrfs: remove SLAB_MEM_SPREAD flag usage

From: Chengming Zhou
Date: Sun Feb 25 2024 - 22:01:21 EST

On 2024/2/24 21:47, chengming.zhou@xxxxxxxxx wrote:
> From: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
>
> 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@xxxxxxx/

Thanks!

>
> Signed-off-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
> ---
> fs/btrfs/backref.c | 2 +-
> fs/btrfs/ctree.c | 2 +-
> fs/btrfs/defrag.c | 2 +-
> fs/btrfs/delayed-inode.c | 2 +-
> fs/btrfs/delayed-ref.c | 8 ++++----
> fs/btrfs/extent-io-tree.c | 2 +-
> fs/btrfs/extent_io.c | 2 +-
> fs/btrfs/extent_map.c | 2 +-
> fs/btrfs/free-space-cache.c | 4 ++--
> fs/btrfs/inode.c | 2 +-
> fs/btrfs/ordered-data.c | 2 +-
> fs/btrfs/transaction.c | 2 +-
> 12 files changed, 16 insertions(+), 16 deletions(-)
>
> diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
> index 6514cb1d404a..f2abb9afd04a 100644
> --- a/fs/btrfs/backref.c
> +++ b/fs/btrfs/backref.c
> @@ -200,7 +200,7 @@ int __init btrfs_prelim_ref_init(void)
> btrfs_prelim_ref_cache = kmem_cache_create("btrfs_prelim_ref",
> sizeof(struct prelim_ref),
> 0,
> - SLAB_MEM_SPREAD,
> + 0,
> NULL);
> if (!btrfs_prelim_ref_cache)
> return -ENOMEM;
> diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
> index bae17dbe71d6..aaf53fd84358 100644
> --- a/fs/btrfs/ctree.c
> +++ b/fs/btrfs/ctree.c
> @@ -5086,7 +5086,7 @@ int btrfs_previous_extent_item(struct btrfs_root *root,
>
> int __init btrfs_ctree_init(void)
> {
> - btrfs_path_cachep = KMEM_CACHE(btrfs_path, SLAB_MEM_SPREAD);
> + btrfs_path_cachep = KMEM_CACHE(btrfs_path, 0);
> if (!btrfs_path_cachep)
> return -ENOMEM;
> return 0;
> diff --git a/fs/btrfs/defrag.c b/fs/btrfs/defrag.c
> index 6d3abfcf92d4..4f9e78a94a0a 100644
> --- a/fs/btrfs/defrag.c
> +++ b/fs/btrfs/defrag.c
> @@ -1516,7 +1516,7 @@ int __init btrfs_auto_defrag_init(void)
> {
> btrfs_inode_defrag_cachep = kmem_cache_create("btrfs_inode_defrag",
> sizeof(struct inode_defrag), 0,
> - SLAB_MEM_SPREAD,
> + 0,
> NULL);
> if (!btrfs_inode_defrag_cachep)
> return -ENOMEM;
> diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
> index 0a7a40d97e91..dd6f566a383f 100644
> --- a/fs/btrfs/delayed-inode.c
> +++ b/fs/btrfs/delayed-inode.c
> @@ -28,7 +28,7 @@ static struct kmem_cache *delayed_node_cache;
>
> int __init btrfs_delayed_inode_init(void)
> {
> - delayed_node_cache = KMEM_CACHE(btrfs_delayed_node, SLAB_MEM_SPREAD);
> + delayed_node_cache = KMEM_CACHE(btrfs_delayed_node, 0);
> if (!delayed_node_cache)
> return -ENOMEM;
> return 0;
> diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
> index c90efc20b8b2..7c5377151a1f 100644
> --- a/fs/btrfs/delayed-ref.c
> +++ b/fs/btrfs/delayed-ref.c
> @@ -1308,22 +1308,22 @@ void __cold btrfs_delayed_ref_exit(void)
> int __init btrfs_delayed_ref_init(void)
> {
> btrfs_delayed_ref_head_cachep = KMEM_CACHE(btrfs_delayed_ref_head,
> - SLAB_MEM_SPREAD);
> + 0);
> if (!btrfs_delayed_ref_head_cachep)
> goto fail;
>
> btrfs_delayed_tree_ref_cachep = KMEM_CACHE(btrfs_delayed_tree_ref,
> - SLAB_MEM_SPREAD);
> + 0);
> if (!btrfs_delayed_tree_ref_cachep)
> goto fail;
>
> btrfs_delayed_data_ref_cachep = KMEM_CACHE(btrfs_delayed_data_ref,
> - SLAB_MEM_SPREAD);
> + 0);
> if (!btrfs_delayed_data_ref_cachep)
> goto fail;
>
> btrfs_delayed_extent_op_cachep = KMEM_CACHE(btrfs_delayed_extent_op,
> - SLAB_MEM_SPREAD);
> + 0);
> if (!btrfs_delayed_extent_op_cachep)
> goto fail;
>
> diff --git a/fs/btrfs/extent-io-tree.c b/fs/btrfs/extent-io-tree.c
> index 6b923c0ef4ea..102572e31636 100644
> --- a/fs/btrfs/extent-io-tree.c
> +++ b/fs/btrfs/extent-io-tree.c
> @@ -1884,7 +1884,7 @@ int __init extent_state_init_cachep(void)
> {
> extent_state_cache = kmem_cache_create("btrfs_extent_state",
> sizeof(struct extent_state), 0,
> - SLAB_MEM_SPREAD, NULL);
> + 0, NULL);
> if (!extent_state_cache)
> return -ENOMEM;
>
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index bfef67c68221..e779a85e752f 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -147,7 +147,7 @@ int __init extent_buffer_init_cachep(void)
> {
> extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer",
> sizeof(struct extent_buffer), 0,
> - SLAB_MEM_SPREAD, NULL);
> + 0, NULL);
> if (!extent_buffer_cache)
> return -ENOMEM;
>
> diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
> index ea08601988de..692d62b2fab2 100644
> --- a/fs/btrfs/extent_map.c
> +++ b/fs/btrfs/extent_map.c
> @@ -16,7 +16,7 @@ int __init extent_map_init(void)
> {
> extent_map_cache = kmem_cache_create("btrfs_extent_map",
> sizeof(struct extent_map), 0,
> - SLAB_MEM_SPREAD, NULL);
> + 0, NULL);
> if (!extent_map_cache)
> return -ENOMEM;
> return 0;
> diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
> index d984912dae06..c8a05d5eb9cb 100644
> --- a/fs/btrfs/free-space-cache.c
> +++ b/fs/btrfs/free-space-cache.c
> @@ -4154,13 +4154,13 @@ int btrfs_set_free_space_cache_v1_active(struct btrfs_fs_info *fs_info, bool act
>
> int __init btrfs_free_space_init(void)
> {
> - btrfs_free_space_cachep = KMEM_CACHE(btrfs_free_space, SLAB_MEM_SPREAD);
> + btrfs_free_space_cachep = KMEM_CACHE(btrfs_free_space, 0);
> if (!btrfs_free_space_cachep)
> return -ENOMEM;
>
> btrfs_free_space_bitmap_cachep = kmem_cache_create("btrfs_free_space_bitmap",
> PAGE_SIZE, PAGE_SIZE,
> - SLAB_MEM_SPREAD, NULL);
> + 0, NULL);
> if (!btrfs_free_space_bitmap_cachep) {
> kmem_cache_destroy(btrfs_free_space_cachep);
> return -ENOMEM;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index df55dd891137..6c4d60746af6 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -8717,7 +8717,7 @@ int __init btrfs_init_cachep(void)
> {
> btrfs_inode_cachep = kmem_cache_create("btrfs_inode",
> sizeof(struct btrfs_inode), 0,
> - SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT,
> + SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
> init_once);
> if (!btrfs_inode_cachep)
> goto fail;
> diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
> index 1ee2fb8dcd6a..b749ba45da2b 100644
> --- a/fs/btrfs/ordered-data.c
> +++ b/fs/btrfs/ordered-data.c
> @@ -1235,7 +1235,7 @@ struct btrfs_ordered_extent *btrfs_split_ordered_extent(
>
> int __init ordered_data_init(void)
> {
> - btrfs_ordered_extent_cache = KMEM_CACHE(btrfs_ordered_extent, SLAB_MEM_SPREAD);
> + btrfs_ordered_extent_cache = KMEM_CACHE(btrfs_ordered_extent, 0);
> if (!btrfs_ordered_extent_cache)
> return -ENOMEM;
>
> diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
> index ea080ec2f927..2f151c5367ed 100644
> --- a/fs/btrfs/transaction.c
> +++ b/fs/btrfs/transaction.c
> @@ -2672,7 +2672,7 @@ void __cold __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
> int __init btrfs_transaction_init(void)
> {
> btrfs_trans_handle_cachep = KMEM_CACHE(btrfs_trans_handle,
> - SLAB_TEMPORARY | SLAB_MEM_SPREAD);
> + SLAB_TEMPORARY);
> if (!btrfs_trans_handle_cachep)
> return -ENOMEM;
> return 0;