From: John Hubbard <jhubbard@nvidia.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: john.hubbard@gmail.com,
"Andrew Morton" <akpm@linux-foundation.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Björn Töpel" <bjorn.topel@intel.com>,
"Boaz Harrosh" <boaz@plexistor.com>,
"Christoph Hellwig" <hch@lst.de>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Dan Williams" <dan.j.williams@intel.com>,
"Dave Chinner" <david@fromorbit.com>,
"David Airlie" <airlied@linux.ie>,
"David S . Miller" <davem@davemloft.net>,
"Ilya Dryomov" <idryomov@gmail.com>, "Jan Kara" <jack@suse.cz>,
"Jason Gunthorpe" <jgg@ziepe.ca>, "Jens Axboe" <axboe@kernel.dk>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Johannes Thumshirn" <jthumshirn@suse.de>,
"Magnus Karlsson" <magnus.karlsson@intel.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Miklos Szeredi" <miklos@szeredi.hu>,
"Ming Lei" <ming.lei@redhat.com>, "Sage Weil" <sage@redhat.com>,
"Santosh Shilimkar" <santosh.shilimkar@oracle.com>,
"Yan Zheng" <zyan@redhat.com>,
netdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-mm@kvack.org, linux-rdma@vger.kernel.org,
bpf@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/3] net/xdp: convert put_page() to put_user_page*()
Date: Tue, 23 Jul 2019 16:24:23 -0700 [thread overview]
Message-ID: <69540e85-b527-0252-7b29-8932660af72d@nvidia.com> (raw)
In-Reply-To: <20190723180612.GB29729@iweiny-DESK2.sc.intel.com>
On 7/23/19 11:06 AM, Ira Weiny wrote:
> On Mon, Jul 22, 2019 at 09:41:34PM -0700, John Hubbard wrote:
>> On 7/22/19 5:25 PM, Ira Weiny wrote:
>>> On Mon, Jul 22, 2019 at 03:34:15PM -0700, john.hubbard@gmail.com wrote:
...
>> Obviously, this stuff is all subject to a certain amount of opinion, but I
>> think I'm on really solid ground as far as precedent goes. So I'm pushing
>> back on the NAK... :)
>
> Fair enough... However, we have discussed in the past how GUP can be a
> confusing interface to use.
>
> So I'd like to see it be more directed. Only using the __put_user_pages()
> version allows us to ID callers easier through a grep of PUP_FLAGS_DIRTY_LOCK
> in addition to directing users to use that interface rather than having to read
> the GUP code to figure out that the 2 calls above are equal. It is not a huge
> deal but...
>
OK, combining all the feedback to date, which is:
* the leading double underscore is unloved,
* set_page_dirty() is under investigation, but likely guilty of incitement
to cause bugs,
...we end up with this:
void put_user_pages_dirty_lock(struct page **pages, unsigned long npages,
bool make_dirty)
...which I have a v2 patchset for, ready to send out. It makes IB all pretty
too. :)
thanks,
--
John Hubbard
NVIDIA
prev parent reply other threads:[~2019-07-23 23:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 22:34 [PATCH 0/3] introduce __put_user_pages(), convert a few call sites john.hubbard
2019-07-22 22:34 ` [PATCH 1/3] mm/gup: introduce __put_user_pages() john.hubbard
2019-07-23 5:53 ` Christoph Hellwig
2019-07-23 6:33 ` John Hubbard
2019-07-23 15:36 ` Christoph Hellwig
2019-07-22 22:34 ` [PATCH 2/3] drivers/gpu/drm/via: convert put_page() to put_user_page*() john.hubbard
2019-07-22 22:34 ` [PATCH 3/3] net/xdp: " john.hubbard
2019-07-23 0:25 ` Ira Weiny
2019-07-23 4:41 ` John Hubbard
2019-07-23 12:47 ` Jason Gunthorpe
2019-07-23 18:06 ` Ira Weiny
2019-07-23 23:24 ` John Hubbard [this message]
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