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Date: Fri, 20 Nov 2020 17:27:25 +0800 From: "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com> To: Dan Williams <dan.j.williams@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, Dave Jiang <dave.jiang@...el.com>, linux-nvdimm <linux-nvdimm@...ts.01.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/1] device-dax: delete a redundancy check in dev_dax_validate_align() On 2020/11/20 17:20, Zhen Lei wrote: > After we have done the alignment check for the length of each range, the > alignment check for dev_dax_size(dev_dax) is no longer needed, because it > get the sum of the length of each range. For example: x/M + y/M = (x + y)/M If x/M is a integer and y/M is also a integer, then (x + y)/M must be a integer. > > Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com> > --- > drivers/dax/bus.c | 7 ------- > 1 file changed, 7 deletions(-) > > diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c > index 1efae11d947a..35f9238c0139 100644 > --- a/drivers/dax/bus.c > +++ b/drivers/dax/bus.c > @@ -1109,16 +1109,9 @@ static ssize_t align_show(struct device *dev, > > static ssize_t dev_dax_validate_align(struct dev_dax *dev_dax) > { > - resource_size_t dev_size = dev_dax_size(dev_dax); > struct device *dev = &dev_dax->dev; > int i; > > - if (dev_size > 0 && !alloc_is_aligned(dev_dax, dev_size)) { > - dev_dbg(dev, "%s: align %u invalid for size %pa\n", > - __func__, dev_dax->align, &dev_size); > - return -EINVAL; > - } > - > for (i = 0; i < dev_dax->nr_range; i++) { > size_t len = range_len(&dev_dax->ranges[i].range); > >
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