From: Jan Kara <jack@suse.cz>
To: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Theodore Ts'o <tytso@mit.edu>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andreas Dilger <adilger.kernel@dilger.ca>,
Christoph Hellwig <hch@lst.de>,
Dan Williams <dan.j.williams@intel.com>,
Dave Chinner <david@fromorbit.com>,
David Airlie <airlied@linux.ie>, Ingo Molnar <mingo@redhat.com>,
Inki Dae <inki.dae@samsung.com>, Jan Kara <jack@suse.cz>,
Jonathan Corbet <corbet@lwn.net>,
Joonyoung Shim <jy0922.shim@samsung.com>,
Krzysztof Kozlowski <krzk@kernel.org>,
Kukjin Kim <kgene@kernel.org>,
Kyungmin Park <kyungmin.park@samsung.com>,
Matthew Wilcox <mawilcox@microsoft.com>,
Patrik Jakobsson <patrik.r.jakobsson@gmail.com>,
Rob Clark <robdclark@gmail.com>,
Seung-Woo Kim <sw0312.kim@samsung.com>,
Steven Rostedt <rostedt@goodmis.org>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org, linux-doc@vger.kernel.org,
linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-nvdimm@lists.01.org,
linux-samsung-soc@vger.kernel.org, linux-xfs@vger.kernel.org
Subject: Re: [PATCH v4 1/5] mm: add mkwrite param to vm_insert_mixed()
Date: Mon, 24 Jul 2017 13:25:30 +0200 [thread overview]
Message-ID: <20170724112530.GI652@quack2.suse.cz> (raw)
In-Reply-To: <20170721223956.29485-2-ross.zwisler@linux.intel.com>
> @@ -1658,14 +1658,28 @@ static int insert_pfn(struct vm_area_struct *vma, unsigned long addr,
> if (!pte)
> goto out;
> retval = -EBUSY;
> - if (!pte_none(*pte))
> - goto out_unlock;
> + if (!pte_none(*pte)) {
> + if (mkwrite) {
> + if (WARN_ON_ONCE(pte_pfn(*pte) != pfn_t_to_pfn(pfn)))
Is the WARN_ON_ONCE() really appropriate here? Your testcase with private
mappings has triggered this situation if I'm right...
Otherwise the patch looks good to me.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-07-24 11:25 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-21 22:39 [PATCH v4 0/5] DAX common 4k zero page Ross Zwisler
2017-07-21 22:39 ` [PATCH v4 1/5] mm: add mkwrite param to vm_insert_mixed() Ross Zwisler
2017-07-22 16:21 ` Dan Williams
2017-07-24 11:15 ` Jan Kara
2017-07-24 15:13 ` Ross Zwisler
2017-07-24 11:25 ` Jan Kara [this message]
2017-07-24 15:23 ` Ross Zwisler
2017-07-24 15:59 ` Jan Kara
2017-07-21 22:39 ` [PATCH v4 2/5] dax: relocate some dax functions Ross Zwisler
2017-07-24 11:35 ` Jan Kara
2017-07-21 22:39 ` [PATCH v4 3/5] dax: use common 4k zero page for dax mmap reads Ross Zwisler
2017-07-24 11:46 ` Jan Kara
2017-07-21 22:39 ` [PATCH v4 4/5] dax: remove DAX code from page_cache_tree_insert() Ross Zwisler
2017-07-24 11:47 ` Jan Kara
2017-07-21 22:39 ` [PATCH v4 5/5] dax: move all DAX radix tree defs to fs/dax.c Ross Zwisler
2017-07-24 11:48 ` Jan Kara
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170724112530.GI652@quack2.suse.cz \
--to=jack@suse.cz \
--cc=adilger.kernel@dilger.ca \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=corbet@lwn.net \
--cc=dan.j.williams@intel.com \
--cc=darrick.wong@oracle.com \
--cc=david@fromorbit.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=freedreno@lists.freedesktop.org \
--cc=hch@lst.de \
--cc=inki.dae@samsung.com \
--cc=jy0922.shim@samsung.com \
--cc=kgene@kernel.org \
--cc=krzk@kernel.org \
--cc=kyungmin.park@samsung.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-ext4@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-nvdimm@lists.01.org \
--cc=linux-samsung-soc@vger.kernel.org \
--cc=linux-xfs@vger.kernel.org \
--cc=mawilcox@microsoft.com \
--cc=mingo@redhat.com \
--cc=patrik.r.jakobsson@gmail.com \
--cc=robdclark@gmail.com \
--cc=ross.zwisler@linux.intel.com \
--cc=rostedt@goodmis.org \
--cc=sw0312.kim@samsung.com \
--cc=tomi.valkeinen@ti.com \
--cc=tytso@mit.edu \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).