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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. :)

John Hubbard

      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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