From: John Hubbard <jhubbard@nvidia•com>
To: Andrew Morton <akpm@linux-foundation•org>
Cc: "Michal Hocko" <mhocko@suse•com>, "Jan Kara" <jack@suse•cz>,
kvm@vger•kernel.org, linux-doc@vger•kernel.org,
"David Airlie" <airlied@linux•ie>,
"Dave Chinner" <david@fromorbit•com>,
dri-devel@lists•freedesktop.org,
LKML <linux-kernel@vger•kernel.org>,
linux-mm@kvack•org, "Paul Mackerras" <paulus@samba•org>,
linux-kselftest@vger•kernel.org,
"Ira Weiny" <ira.weiny@intel•com>,
"Jonathan Corbet" <corbet@lwn•net>,
linux-rdma@vger•kernel.org,
"Christoph Hellwig" <hch@infradead•org>,
"Jason Gunthorpe" <jgg@ziepe•ca>,
"Vlastimil Babka" <vbabka@suse•cz>,
"Björn Töpel" <bjorn.topel@intel•com>,
linux-media@vger•kernel.org, "Shuah Khan" <shuah@kernel•org>,
"John Hubbard" <jhubbard@nvidia•com>,
linux-block@vger•kernel.org, "Jérôme Glisse" <jglisse@redhat•com>,
"Al Viro" <viro@zeniv•linux.org.uk>,
"Dan Williams" <dan.j.williams@intel•com>,
"Mauro Carvalho Chehab" <mchehab@kernel•org>,
"Magnus Karlsson" <magnus.karlsson@intel•com>,
"Jens Axboe" <axboe@kernel•dk>,
netdev@vger•kernel.org,
"Alex Williamson" <alex.williamson@redhat•com>,
"Daniel Vetter" <daniel@ffwll•ch>,
linux-fsdevel@vger•kernel.org, bpf@vger•kernel.org,
linuxppc-dev@lists•ozlabs.org,
"David S . Miller" <davem@davemloft•net>,
"Mike Kravetz" <mike.kravetz@oracle•com>
Subject: [PATCH v6 11/24] goldish_pipe: convert to pin_user_pages() and put_user_page()
Date: Tue, 19 Nov 2019 00:16:30 -0800 [thread overview]
Message-ID: <20191119081643.1866232-12-jhubbard@nvidia.com> (raw)
In-Reply-To: <20191119081643.1866232-1-jhubbard@nvidia.com>
1. Call the new global pin_user_pages_fast(), from pin_goldfish_pages().
2. As required by pin_user_pages(), release these pages via
put_user_page(). In this case, do so via put_user_pages_dirty_lock().
That has the side effect of calling set_page_dirty_lock(), instead
of set_page_dirty(). This is probably more accurate.
As Christoph Hellwig put it, "set_page_dirty() is only safe if we are
dealing with a file backed page where we have reference on the inode it
hangs off." [1]
Another side effect is that the release code is simplified because
the page[] loop is now in gup.c instead of here, so just delete the
local release_user_pages() entirely, and call
put_user_pages_dirty_lock() directly, instead.
[1] https://lore.kernel.org/r/20190723153640.GB720@lst.de
Reviewed-by: Jan Kara <jack@suse•cz>
Reviewed-by: Ira Weiny <ira.weiny@intel•com>
Signed-off-by: John Hubbard <jhubbard@nvidia•com>
---
drivers/platform/goldfish/goldfish_pipe.c | 17 +++--------------
1 file changed, 3 insertions(+), 14 deletions(-)
diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index 7ed2a21a0bac..635a8bc1b480 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -274,7 +274,7 @@ static int pin_goldfish_pages(unsigned long first_page,
*iter_last_page_size = last_page_size;
}
- ret = get_user_pages_fast(first_page, requested_pages,
+ ret = pin_user_pages_fast(first_page, requested_pages,
!is_write ? FOLL_WRITE : 0,
pages);
if (ret <= 0)
@@ -285,18 +285,6 @@ static int pin_goldfish_pages(unsigned long first_page,
return ret;
}
-static void release_user_pages(struct page **pages, int pages_count,
- int is_write, s32 consumed_size)
-{
- int i;
-
- for (i = 0; i < pages_count; i++) {
- if (!is_write && consumed_size > 0)
- set_page_dirty(pages[i]);
- put_page(pages[i]);
- }
-}
-
/* Populate the call parameters, merging adjacent pages together */
static void populate_rw_params(struct page **pages,
int pages_count,
@@ -372,7 +360,8 @@ static int transfer_max_buffers(struct goldfish_pipe *pipe,
*consumed_size = pipe->command_buffer->rw_params.consumed_size;
- release_user_pages(pipe->pages, pages_count, is_write, *consumed_size);
+ put_user_pages_dirty_lock(pipe->pages, pages_count,
+ !is_write && *consumed_size > 0);
mutex_unlock(&pipe->lock);
return 0;
--
2.24.0
next prev parent reply other threads:[~2019-11-19 8:44 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-19 8:16 [PATCH v6 00/24] mm/gup: track dma-pinned pages: FOLL_PIN John Hubbard
2019-11-19 8:16 ` [PATCH v6 01/24] mm/gup: pass flags arg to __gup_device_* functions John Hubbard
2019-11-19 8:16 ` [PATCH v6 02/24] mm/gup: factor out duplicate code from four routines John Hubbard
2019-11-19 10:19 ` Jan Kara
2019-11-19 8:16 ` [PATCH v6 03/24] mm/gup: move try_get_compound_head() to top, fix minor issues John Hubbard
2019-11-19 8:16 ` [PATCH v6 04/24] mm: Cleanup __put_devmap_managed_page() vs ->page_free() John Hubbard
2019-11-19 8:16 ` [PATCH v6 05/24] mm: devmap: refactor 1-based refcounting for ZONE_DEVICE pages John Hubbard
2019-11-19 8:16 ` [PATCH v6 06/24] goldish_pipe: rename local pin_user_pages() routine John Hubbard
2019-11-19 8:16 ` [PATCH v6 07/24] IB/umem: use get_user_pages_fast() to pin DMA pages John Hubbard
2019-11-19 8:16 ` [PATCH v6 08/24] media/v4l2-core: set pages dirty upon releasing DMA buffers John Hubbard
2019-11-19 8:16 ` [PATCH v6 09/24] vfio, mm: fix get_user_pages_remote() and FOLL_LONGTERM John Hubbard
2019-11-19 8:16 ` [PATCH v6 10/24] mm/gup: introduce pin_user_pages*() and FOLL_PIN John Hubbard
2019-11-19 8:16 ` John Hubbard [this message]
2019-11-19 8:16 ` [PATCH v6 12/24] IB/{core, hw, umem}: set FOLL_PIN via pin_user_pages*(), fix up ODP John Hubbard
2019-11-19 8:16 ` [PATCH v6 13/24] mm/process_vm_access: set FOLL_PIN via pin_user_pages_remote() John Hubbard
2019-11-19 8:16 ` [PATCH v6 14/24] drm/via: set FOLL_PIN via pin_user_pages_fast() John Hubbard
2019-11-19 8:16 ` [PATCH v6 15/24] fs/io_uring: set FOLL_PIN via pin_user_pages() John Hubbard
2019-11-19 16:10 ` Jens Axboe
2019-11-20 7:03 ` John Hubbard
2019-11-19 8:16 ` [PATCH v6 16/24] net/xdp: " John Hubbard
2019-11-19 8:16 ` [PATCH v6 17/24] mm/gup: track FOLL_PIN pages John Hubbard
2019-11-19 11:37 ` Jan Kara
2019-11-20 7:17 ` John Hubbard
2019-11-19 8:16 ` [PATCH v6 18/24] media/v4l2-core: pin_user_pages (FOLL_PIN) and put_user_page() conversion John Hubbard
2019-11-19 8:16 ` [PATCH v6 19/24] vfio, mm: " John Hubbard
2019-11-19 8:16 ` [PATCH v6 20/24] powerpc: book3s64: convert to pin_user_pages() and put_user_page() John Hubbard
2019-11-19 8:16 ` [PATCH v6 21/24] mm/gup_benchmark: use proper FOLL_WRITE flags instead of hard-coding "1" John Hubbard
2019-11-19 8:16 ` [PATCH v6 22/24] mm/gup_benchmark: support pin_user_pages() and related calls John Hubbard
2019-11-19 8:16 ` [PATCH v6 23/24] selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL_PIN coverage John Hubbard
2019-11-19 8:16 ` [PATCH v6 24/24] mm, tree-wide: rename put_user_page*() to unpin_user_page*() John Hubbard
2019-11-19 11:39 ` Jan Kara
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