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

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Date:   Mon, 17 Apr 2017 10:54:29 +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, kernel-team@....com,
        stable@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH 1/3] zram: fix operator precedence to get offset

On (04/17/17 10:21), Sergey Senozhatsky wrote:
> > However, it should be *fixed* to prevent confusion in future

or may be something like below? can save us some cycles.

remove this calculation

-       offset = sector & (SECTORS_PER_PAGE - 1) << SECTOR_SHIFT;


and pass 0 to zram_bvec_rw()

-       err = zram_bvec_rw(zram, &bv, index, offset, is_write);
+       err = zram_bvec_rw(zram, &bv, index, 0, is_write);


	-ss