The patch titled
Subject: mm/gup: assert that the mmap lock is held in __get_user_pages()
has been removed from the -mm tree. Its filename was
mm-gup-assert-that-the-mmap-lock-is-held-in-__get_user_pages.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Jann Horn <jannh@xxxxxxxxxx>
Subject: mm/gup: assert that the mmap lock is held in __get_user_pages()
After having cleaned up all GUP callers (except for the atomisp staging
driver, which currently gets mmap locking completely wrong [1]) to always
ensure that they hold the mmap lock when calling into GUP (unless the mm
is not yet globally visible), add an assertion to make sure it stays that
way going forward.
[1] https://lore.kernel.org/lkml/CAG48ez3tZAb9JVhw4T5e-i=h2_DUZxfNRTDsagSRCVazNXx5qA@xxxxxxxxxxxxxx/
Link: https://lkml.kernel.org/r/CAG48ez1GM==OnHpS=ghqZNJPn02FCDUEHc7GQmGRMXUD_aKudg@xxxxxxxxxxxxxx
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Acked-by: Michel Lespinasse <walken@xxxxxxxxxx>
Cc: "Eric W . Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/gup.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/gup.c~mm-gup-assert-that-the-mmap-lock-is-held-in-__get_user_pages
+++ a/mm/gup.c
@@ -996,6 +996,8 @@ static long __get_user_pages(struct mm_s
struct vm_area_struct *vma = NULL;
struct follow_page_context ctx = { NULL };
+ mmap_assert_locked(mm);
+
if (!nr_pages)
return 0;
_
Patches currently in -mm which might be from jannh@xxxxxxxxxx are
