linux-kernel - Re: [PATCH 2/2] fs: direct-io: use DIV_ROUND

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Date:   Tue, 25 May 2021 10:38:30 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Wu Bo <wubo40@...wei.com>
Cc:     linfeilong@...wei.com, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        davem@...emloft.net, herbert@...dor.apana.org.au,
        viro@...iv.linux.org.uk
Subject: Re: [PATCH 2/2] fs: direct-io: use DIV_ROUND_UP helper macro for
 calculations

Wu Bo <wubo40@...wei.com> a écrit :

> From: Wu Bo <wubo40@...wei.com>
>
> Replace open coded divisor calculations with the DIV_ROUND_UP kernel
> macro for better readability.
>
> Signed-off-by: Wu Bo <wubo40@...wei.com>
> ---
>  fs/direct-io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/direct-io.c b/fs/direct-io.c
> index b2e86e7..6e7d402 100644
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -195,7 +195,7 @@ static inline int dio_refill_pages(struct dio  
> *dio, struct dio_submit *sdio)
>  		iov_iter_advance(sdio->iter, ret);
>  		ret += sdio->from;
>  		sdio->head = 0;
> -		sdio->tail = (ret + PAGE_SIZE - 1) / PAGE_SIZE;
> +		sdio->tail = DIV_ROUND_UP(ret, PAGE_SIZE);

Use PFN_UP() instead.


>  		sdio->to = ((ret - 1) & (PAGE_SIZE - 1)) + 1;
>  		return 0;
>  	}
> --
> 1.8.3.1