The quilt patch titled
Subject: mm/frame-vector: remove FOLL_FORCE usage
has been removed from the -mm tree. Its filename was
mm-frame-vector-remove-foll_force-usage.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/frame-vector: remove FOLL_FORCE usage
Date: Wed, 16 Nov 2022 11:26:55 +0100
FOLL_FORCE is really only for ptrace access. According to commit
707947247e95 ("media: videobuf2-vmalloc: get_userptr: buffers are always
writable"), get_vaddr_frames() currently pins all pages writable as a
workaround for issues with read-only buffers.
FOLL_FORCE, however, seems to be a legacy leftover as it predates
commit 707947247e95 ("media: videobuf2-vmalloc: get_userptr: buffers are
always writable"). Let's just remove it.
Once the read-only buffer issue has been resolved, FOLL_WRITE could
again be set depending on the DMA direction.
Link: https://lkml.kernel.org/r/20221116102659.70287-17-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Acked-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Acked-by: Tomasz Figa <tfiga@xxxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/media/common/videobuf2/frame_vector.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/media/common/videobuf2/frame_vector.c~mm-frame-vector-remove-foll_force-usage
+++ a/drivers/media/common/videobuf2/frame_vector.c
@@ -50,7 +50,7 @@ int get_vaddr_frames(unsigned long start
start = untagged_addr(start);
ret = pin_user_pages_fast(start, nr_frames,
- FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM,
+ FOLL_WRITE | FOLL_LONGTERM,
(struct page **)(vec->ptrs));
if (ret > 0) {
vec->got_ref = true;
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
selftests-vm-add-ksm-unmerge-tests.patch
mm-pagewalk-dont-trigger-test_walk-in-walk_page_vma.patch
selftests-vm-add-test-to-measure-madv_unmergeable-performance.patch
mm-ksm-simplify-break_ksm-to-not-rely-on-vm_fault_write.patch
mm-remove-vm_fault_write.patch
mm-ksm-fix-ksm-cow-breaking-with-userfaultfd-wp-via-fault_flag_unshare.patch
mm-pagewalk-add-walk_page_range_vma.patch
mm-ksm-convert-break_ksm-to-use-walk_page_range_vma.patch
mm-gup-remove-foll_migration.patch
