linux-kernel - Re: [PATCH v1] bcache: Use vmalloc

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Message-Id: <lw5v5sdv2qdgi2kyrbohw6avp4ieyor4glijtwyovvl2lk2t7v@aithwxnmumbl>
Date: Wed, 22 Oct 2025 20:06:06 +0800
From: "Coly Li" <colyli@...as.com>
To: "tanze" <tanze@...inos.cn>
Cc: <kent.overstreet@...ux.dev>, <john.g.garry@...cle.com>, 
	<linux-kernel@...r.kernel.org>, <linux-bcache@...r.kernel.org>
Subject: Re: [PATCH v1] bcache: Use vmalloc_array() to improve code

On Fri, Oct 17, 2025 at 07:27:39PM +0800, tanze wrote:
> Remove array_size() calls and replace vmalloc(), Due to vmalloc_array() is optimized better,
> uses fewer instructions, and handles overflow more concisely[1].
> 
> Signed-off-by: tanze <tanze@...inos.cn>
> ---
> Please ignore the previous email, a simple formatting error 
> has been corrected in this one.
> 
> Thanks
> ---
>  drivers/md/bcache/sysfs.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
> index 826b14cae4e5..7bb5605ad7fb 100644
> --- a/drivers/md/bcache/sysfs.c
> +++ b/drivers/md/bcache/sysfs.c
> @@ -1061,8 +1061,7 @@ SHOW(__bch_cache)
>  		uint16_t q[31], *p, *cached;
>  		ssize_t ret;
>  
> -		cached = p = vmalloc(array_size(sizeof(uint16_t),
> -						ca->sb.nbuckets));
> +		cached = p = vmalloc_array(ca->sb.nbuckets, sizeof(uint16_t));
>  		if (!p)
>  			return -ENOMEM;

Yes, this version is better.
It will be cool if you may refine the name format in your Signed-off-by.

Thanks.

Coly Li