The patch titled
Subject: mm/gup: introduce pin_user_pages_locked()
has been added to the -mm tree. Its filename is
mm-gup-introduce-pin_user_pages_locked-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-gup-introduce-pin_user_pages_locked-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-gup-introduce-pin_user_pages_locked-v2.patch
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------------------------------------------------------
From: John Hubbard <jhubbard@xxxxxxxxxx>
Subject: mm/gup: introduce pin_user_pages_locked()
add an assert-and-return to the corresponding get_user_pages_locked()
call, to keep out any externally set FOLL_PIN flag,
Link: http://lkml.kernel.org/r/20200531234131.770697-2-jhubbard@xxxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>
Cc: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/gup.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/mm/gup.c~mm-gup-introduce-pin_user_pages_locked-v2
+++ a/mm/gup.c
@@ -2020,6 +2020,12 @@ long get_user_pages_locked(unsigned long
*/
if (WARN_ON_ONCE(gup_flags & FOLL_LONGTERM))
return -EINVAL;
+ /*
+ * FOLL_PIN must only be set internally by the pin_user_pages*() APIs,
+ * never directly by the caller, so enforce that:
+ */
+ if (WARN_ON_ONCE(gup_flags & FOLL_PIN))
+ return -EINVAL;
return __get_user_pages_locked(current, current->mm, start, nr_pages,
pages, NULL, locked,
_
Patches currently in -mm which might be from jhubbard@xxxxxxxxxx are
mm-gup-introduce-pin_user_pages_unlocked.patch
ivtv-convert-get_user_pages-pin_user_pages.patch
mm-gup-move-__get_user_pages_fast-down-a-few-lines-in-gupc.patch
mm-gup-refactor-and-de-duplicate-gup_fast-code.patch
mm-gup-refactor-and-de-duplicate-gup_fast-code-fix.patch
mm-gup-introduce-pin_user_pages_fast_only.patch
drm-i915-convert-get_user_pages-pin_user_pages.patch
mm-gup-might_lock_readmmap_sem-in-get_user_pages_fast.patch
khugepaged-add-self-test-fix-3.patch
rapidio-convert-get_user_pages-pin_user_pages.patch
mm-gup-update-pin_user_pagesrst-for-case-3-mmu-notifiers.patch
mm-gup-introduce-pin_user_pages_locked.patch
mm-gup-introduce-pin_user_pages_locked-v2.patch
mm-gup-frame_vector-convert-get_user_pages-pin_user_pages.patch
mm-gup-documentation-fix-for-pin_user_pages-apis.patch
