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Date: Tue, 12 Jan 2021 23:34:06 +0800 From: Feng Li <lifeng1519@...il.com> To: Li Feng <fengli@...rtx.com> Cc: Jens Axboe <axboe@...nel.dk>, "open list:BLOCK LAYER" <linux-block@...r.kernel.org>, open list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] blk: avoid divide-by-zero with zero granularity I'm sorry, ignore this one. Li Feng <fengli@...rtx.com> 于2021年1月12日周二 下午11:30写道: > > If the physical_block_size and io_min is less than a sector, the > 'granularity >> SECTOR_SHIFT' will be zero. > > Signed-off-by: Li Feng <fengli@...rtx.com> > --- > include/linux/blkdev.h | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h > index f94ee3089e01..4d029e95adb4 100644 > --- a/include/linux/blkdev.h > +++ b/include/linux/blkdev.h > @@ -1485,6 +1485,10 @@ static inline int queue_alignment_offset(const struct request_queue *q) > static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) > { > unsigned int granularity = max(lim->physical_block_size, lim->io_min); > + granularity = granularity >> SECTOR_SHIFT; > + if (!granularity) > + return 0; > + > unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) > << SECTOR_SHIFT; > > -- > 2.29.2 >
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