linux-kernel - Re: [PATCH] usb: isp1760: remove SLAB_MEM

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Message-ID: <e7f00fbe-a676-4d47-b1bb-cc69cc391172@linux.dev>
Date: Mon, 26 Feb 2024 11:02:24 +0800
From: Chengming Zhou <chengming.zhou@...ux.dev>
To: rui.silva@...aro.org, gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, vbabka@...e.cz,
 roman.gushchin@...ux.dev, Xiongwei.Song@...driver.com
Subject: Re: [PATCH] usb: isp1760: remove SLAB_MEM_SPREAD flag usage

On 2024/2/24 21:52, 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 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@...edance.com>
> ---
>  drivers/usb/isp1760/isp1760-hcd.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/usb/isp1760/isp1760-hcd.c b/drivers/usb/isp1760/isp1760-hcd.c
> index 76862ba40f35..0e5e4cb74c87 100644
> --- a/drivers/usb/isp1760/isp1760-hcd.c
> +++ b/drivers/usb/isp1760/isp1760-hcd.c
> @@ -2521,21 +2521,19 @@ static const struct hc_driver isp1760_hc_driver = {
>  int __init isp1760_init_kmem_once(void)
>  {
>  	urb_listitem_cachep = kmem_cache_create("isp1760_urb_listitem",
> -			sizeof(struct urb_listitem), 0, SLAB_TEMPORARY |
> -			SLAB_MEM_SPREAD, NULL);
> +			sizeof(struct urb_listitem), 0, SLAB_TEMPORARY, NULL);
>  
>  	if (!urb_listitem_cachep)
>  		return -ENOMEM;
>  
>  	qtd_cachep = kmem_cache_create("isp1760_qtd",
> -			sizeof(struct isp1760_qtd), 0, SLAB_TEMPORARY |
> -			SLAB_MEM_SPREAD, NULL);
> +			sizeof(struct isp1760_qtd), 0, SLAB_TEMPORARY, NULL);
>  
>  	if (!qtd_cachep)
>  		goto destroy_urb_listitem;
>  
>  	qh_cachep = kmem_cache_create("isp1760_qh", sizeof(struct isp1760_qh),
> -			0, SLAB_TEMPORARY | SLAB_MEM_SPREAD, NULL);
> +			0, SLAB_TEMPORARY, NULL);
>  
>  	if (!qh_cachep)
>  		goto destroy_qtd;