linux-kernel - Re: [PATCH 1/3] zram: fix operator precedence to get offset

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Message-ID: <20170414050747.GB462@jagdpanzerIV.localdomain>
Date:   Fri, 14 Apr 2017 14:07:47 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        kernel-team@....com, stable@...r.kernel.org
Subject: Re: [PATCH 1/3] zram: fix operator precedence to get offset

Hello,

On (04/13/17 09:17), Minchan Kim wrote:
[..]
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 9e2199060040..83c38a123242 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -930,7 +930,7 @@ static int zram_rw_page(struct block_device *bdev, sector_t sector,
>  	}
>  
>  	index = sector >> SECTORS_PER_PAGE_SHIFT;
> -	offset = sector & (SECTORS_PER_PAGE - 1) << SECTOR_SHIFT;
> +	offset = (sector & (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT;

sorry, can it actually produce different results?

	-ss