From: akpm@linux-foundation.org
To: alex.williamson@redhat.com, aneesh.kumar@linux.ibm.com,
axboe@kernel.dk, bjorn.topel@intel.com, corbet@lwn.net,
dan.j.williams@intel.com, daniel.vetter@ffwll.ch, hch@lst.de,
hverkuil-cisco@xs4all.nl, ira.weiny@intel.com, jack@suse.cz,
jgg@mellanox.com, jgg@ziepe.ca, jglisse@redhat.com,
jhubbard@nvidia.com, kirill@shutemov.name, leonro@mellanox.com,
mchehab@kernel.org, mm-commits@vger.kernel.org,
rppt@linux.ibm.com
Subject: [merged] mm-process_vm_access-set-foll_pin-via-pin_user_pages_remote.patch removed from -mm tree
Date: Fri, 31 Jan 2020 15:17:55 -0800 [thread overview]
Message-ID: <20200131231755.Gi0MsfeQX%akpm@linux-foundation.org> (raw)
The patch titled
Subject: mm/process_vm_access: set FOLL_PIN via pin_user_pages_remote()
has been removed from the -mm tree. Its filename was
mm-process_vm_access-set-foll_pin-via-pin_user_pages_remote.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: John Hubbard <jhubbard@nvidia.com>
Subject: mm/process_vm_access: set FOLL_PIN via pin_user_pages_remote()
Convert process_vm_access to use the new pin_user_pages_remote() call,
which sets FOLL_PIN. Setting FOLL_PIN is now required for code that
requires tracking of pinned pages.
Also, release the pages via put_user_page*().
Also, rename "pages" to "pinned_pages", as this makes for easier reading
of process_vm_rw_single_vec().
Link: http://lkml.kernel.org/r/20200107224558.2362728-15-jhubbard@nvidia.com
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Björn Töpel <bjorn.topel@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Leon Romanovsky <leonro@mellanox.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/process_vm_access.c | 28 +++++++++++++++-------------
1 file changed, 15 insertions(+), 13 deletions(-)
--- a/mm/process_vm_access.c~mm-process_vm_access-set-foll_pin-via-pin_user_pages_remote
+++ a/mm/process_vm_access.c
@@ -42,12 +42,11 @@ static int process_vm_rw_pages(struct pa
if (copy > len)
copy = len;
- if (vm_write) {
+ if (vm_write)
copied = copy_page_from_iter(page, offset, copy, iter);
- set_page_dirty_lock(page);
- } else {
+ else
copied = copy_page_to_iter(page, offset, copy, iter);
- }
+
len -= copied;
if (copied < copy && iov_iter_count(iter))
return -EFAULT;
@@ -96,7 +95,7 @@ static int process_vm_rw_single_vec(unsi
flags |= FOLL_WRITE;
while (!rc && nr_pages && iov_iter_count(iter)) {
- int pages = min(nr_pages, max_pages_per_loop);
+ int pinned_pages = min(nr_pages, max_pages_per_loop);
int locked = 1;
size_t bytes;
@@ -106,14 +105,15 @@ static int process_vm_rw_single_vec(unsi
* current/current->mm
*/
down_read(&mm->mmap_sem);
- pages = get_user_pages_remote(task, mm, pa, pages, flags,
- process_pages, NULL, &locked);
+ pinned_pages = pin_user_pages_remote(task, mm, pa, pinned_pages,
+ flags, process_pages,
+ NULL, &locked);
if (locked)
up_read(&mm->mmap_sem);
- if (pages <= 0)
+ if (pinned_pages <= 0)
return -EFAULT;
- bytes = pages * PAGE_SIZE - start_offset;
+ bytes = pinned_pages * PAGE_SIZE - start_offset;
if (bytes > len)
bytes = len;
@@ -122,10 +122,12 @@ static int process_vm_rw_single_vec(unsi
vm_write);
len -= bytes;
start_offset = 0;
- nr_pages -= pages;
- pa += pages * PAGE_SIZE;
- while (pages)
- put_page(process_pages[--pages]);
+ nr_pages -= pinned_pages;
+ pa += pinned_pages * PAGE_SIZE;
+
+ /* If vm_write is set, the pages need to be made dirty: */
+ put_user_pages_dirty_lock(process_pages, pinned_pages,
+ vm_write);
}
return rc;
_
Patches currently in -mm which might be from jhubbard@nvidia.com are
reply other threads:[~2020-01-31 23:17 UTC|newest]
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