The patch titled
Subject: userfaultfd: non-cooperative: dup_userfaultfd: use mm_count instead of mm_users
has been added to the -mm tree. Its filename is
userfaultfd-non-cooperative-dup_userfaultfd-use-mm_count-instead-of-mm_users.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-non-cooperative-dup_userfaultfd-use-mm_count-instead-of-mm_users.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-non-cooperative-dup_userfaultfd-use-mm_count-instead-of-mm_users.patch
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------------------------------------------------------
From: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Subject: userfaultfd: non-cooperative: dup_userfaultfd: use mm_count instead of mm_users
Since commit d2005e3f41d4 (userfaultfd: don't pin the user memory in
userfaultfd_file_create()) userfaultfd uses mm_count rather than mm_users
to pin mm_struct. Make dup_userfaultfd consistent with this behaviour
Link: http://lkml.kernel.org/r/20161216144821.5183-11-aarcange@xxxxxxxxxx
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: "Dr. David Alan Gilbert" <dgilbert@xxxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Cc: Michael Rapoport <RAPOPORT@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/userfaultfd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN fs/userfaultfd.c~userfaultfd-non-cooperative-dup_userfaultfd-use-mm_count-instead-of-mm_users fs/userfaultfd.c
--- a/fs/userfaultfd.c~userfaultfd-non-cooperative-dup_userfaultfd-use-mm_count-instead-of-mm_users
+++ a/fs/userfaultfd.c
@@ -525,7 +525,7 @@ int dup_userfaultfd(struct vm_area_struc
ctx->features = octx->features;
ctx->released = false;
ctx->mm = vma->vm_mm;
- atomic_inc(&ctx->mm->mm_users);
+ atomic_inc(&ctx->mm->mm_count);
userfaultfd_ctx_get(octx);
fctx->orig = octx;
_
Patches currently in -mm which might be from rppt@xxxxxxxxxxxxxxxxxx are
userfaultfd-non-cooperative-dup_userfaultfd-use-mm_count-instead-of-mm_users.patch
userfaultfd-introduce-vma_can_userfault.patch
userfaultfd-shmem-add-shmem_mcopy_atomic_pte-for-userfaultfd-support.patch
userfaultfd-shmem-introduce-vma_is_shmem.patch
userfaultfd-shmem-use-shmem_mcopy_atomic_pte-for-shared-memory.patch
userfaultfd-shmem-add-userfaultfd-hook-for-shared-memory-faults.patch
userfaultfd-shmem-allow-registration-of-shared-memory-ranges.patch
userfaultfd-shmem-add-userfaultfd_shmem-test.patch
userfaultfd-non-cooperative-selftest-introduce-userfaultfd_open.patch
userfaultfd-non-cooperative-selftest-add-ufd-parameter-to-copy_page.patch
userfaultfd-non-cooperative-selftest-add-test-for-fork-madvdontneed-and-remap-events.patch
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