linux-kernel - Re: [PATCH] ubi: fastmap: Use the bitmap API to allocate bitmaps

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Date:   Fri, 8 Jul 2022 17:07:44 +0800
From:   Zhihao Cheng <chengzhihao1@...wei.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Richard Weinberger <richard@....at>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        "Vignesh Raghavendra" <vigneshr@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC:     <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>,
        <linux-mtd@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ubi: fastmap: Use the bitmap API to allocate bitmaps

在 2022/7/5 2:46, Christophe JAILLET 写道:
> Use bitmap_zalloc()/bitmap_free() instead of hand-writing them.
> 
> It is less verbose and it improves the semantic.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>   drivers/mtd/ubi/fastmap.c | 10 ++++------
>   1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
> index 6e95c4b1473e..ca2d9efe62c3 100644
> --- a/drivers/mtd/ubi/fastmap.c
> +++ b/drivers/mtd/ubi/fastmap.c
> @@ -20,8 +20,7 @@ static inline unsigned long *init_seen(struct ubi_device *ubi)
>   	if (!ubi_dbg_chk_fastmap(ubi))
>   		return NULL;
>   
> -	ret = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long),
> -		      GFP_KERNEL);
> +	ret = bitmap_zalloc(ubi->peb_count, GFP_KERNEL);
>   	if (!ret)
>   		return ERR_PTR(-ENOMEM);
>   
> @@ -34,7 +33,7 @@ static inline unsigned long *init_seen(struct ubi_device *ubi)
>    */
>   static inline void free_seen(unsigned long *seen)
>   {
> -	kfree(seen);
> +	bitmap_free(seen);
>   }
>   
>   /**
> @@ -1108,8 +1107,7 @@ int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count)
>   	if (!ubi->fast_attach)
>   		return 0;
>   
> -	vol->checkmap = kcalloc(BITS_TO_LONGS(leb_count), sizeof(unsigned long),
> -				GFP_KERNEL);
> +	vol->checkmap = bitmap_zalloc(leb_count, GFP_KERNEL);
>   	if (!vol->checkmap)
>   		return -ENOMEM;
>   
> @@ -1118,7 +1116,7 @@ int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count)
>   
>   void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol)
>   {
> -	kfree(vol->checkmap);
> +	bitmap_free(vol->checkmap);
>   }
>   
>   /**
> 
Reviewed-by: Zhihao Cheng <chengzhihao1@...wei.com>