From: Logan Gunthorpe <logang@deltatee.com>
To: Yishai Hadas <yishaih@nvidia.com>,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-mm@kvack.org, jgg@nvidia.com, axboe@kernel.dk
Cc: hch@lst.de, alex.williamson@redhat.com, leonro@nvidia.com,
maorg@nvidia.com
Subject: Re: [PATCH] lib/scatterlist: Fix to calculate the last_pg properly
Date: Mon, 9 Jan 2023 11:08:44 -0700 [thread overview]
Message-ID: <f8168426-def6-333a-53b4-8947341b84c4@deltatee.com> (raw)
In-Reply-To: <20230109144701.83021-1-yishaih@nvidia.com>
On 2023-01-09 07:47, Yishai Hadas wrote:
> The last_pg is wrong, it is actually the first page of the last
> scatterlist element. To get the last page of the last scatterlist
> element we have to add prv->length. So it is checking mergability
> against the wrong page, Further, a SG element is not guaranteed to end
> on a page boundary, so we have to check the sub page location also for
> merge eligibility.
>
> Fix the above by checking physical contiguity, compute the actual last
> page and then call pages_are_mergable().
>
> Fixes: 1567b49d1a40 ("lib/scatterlist: add check when merging zone device pages")
> Reported-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Looks right by my eye, thanks.
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Logan
next prev parent reply other threads:[~2023-01-09 18:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-09 14:47 Yishai Hadas
2023-01-09 18:08 ` Logan Gunthorpe [this message]
2023-01-10 3:18 ` Jens Axboe
2023-01-11 0:03 ` Andrew Morton
2023-01-11 13:28 ` Jason Gunthorpe
2023-01-10 5:08 ` Matthew Wilcox
2023-01-10 8:01 ` Yishai Hadas
2023-01-10 13:53 ` Jason Gunthorpe
2023-01-10 15:05 ` Yishai Hadas
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