linux-kernel - Re: [PATCH] ubifs: vmalloc(array_size()) -> vmalloc

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Message-ID: <c46d7739-592e-b8c4-7a7e-6b39015156d7@huawei.com>
Date: Tue, 19 Aug 2025 09:17:03 +0800
From: Zhihao Cheng <chengzhihao1@...wei.com>
To: Qianfeng Rong <rongqianfeng@...o.com>, Richard Weinberger
	<richard@....at>, <linux-mtd@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ubifs: vmalloc(array_size()) -> vmalloc_array()

在 2025/8/17 16:12, Qianfeng Rong 写道:
> Remove array_size() calls and replace vmalloc() with vmalloc_array() in
> ubifs_create_dflt_lpt()/lpt_init_rd()/lpt_init_wr(). vmalloc_array() is
> optimized better, resulting in less instructions being used [1].
> 
> [1]: https://lore.kernel.org/lkml/abc66ec5-85a4-47e1-9759-2f60ab111971@vivo.com/
> 
> Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
> ---
>   fs/ubifs/lpt.c | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)

Reviewed-by: Zhihao Cheng <chengzhihao1@...wei.com>
> 
> diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
> index 441d0beca4cf..dde0aa3287f4 100644
> --- a/fs/ubifs/lpt.c
> +++ b/fs/ubifs/lpt.c
> @@ -628,8 +628,8 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
>   	pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_KERNEL);
>   	nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_KERNEL);
>   	buf = vmalloc(c->leb_size);
> -	ltab = vmalloc(array_size(sizeof(struct ubifs_lpt_lprops),
> -				  c->lpt_lebs));
> +	ltab = vmalloc_array(c->lpt_lebs,
> +			     sizeof(struct ubifs_lpt_lprops));
>   	if (!pnode || !nnode || !buf || !ltab || !lsave) {
>   		err = -ENOMEM;
>   		goto out;
> @@ -1777,8 +1777,8 @@ static int lpt_init_rd(struct ubifs_info *c)
>   {
>   	int err, i;
>   
> -	c->ltab = vmalloc(array_size(sizeof(struct ubifs_lpt_lprops),
> -				     c->lpt_lebs));
> +	c->ltab = vmalloc_array(c->lpt_lebs,
> +				sizeof(struct ubifs_lpt_lprops));
>   	if (!c->ltab)
>   		return -ENOMEM;
>   
> @@ -1846,8 +1846,8 @@ static int lpt_init_wr(struct ubifs_info *c)
>   {
>   	int err, i;
>   
> -	c->ltab_cmt = vmalloc(array_size(sizeof(struct ubifs_lpt_lprops),
> -					 c->lpt_lebs));
> +	c->ltab_cmt = vmalloc_array(c->lpt_lebs,
> +				    sizeof(struct ubifs_lpt_lprops));
>   	if (!c->ltab_cmt)
>   		return -ENOMEM;
>   
>