+ mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix.patch added to -mm tree

+ mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix
has been added to the -mm tree.  Its filename is
     mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix.patch

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------------------------------------------------------
From: Andrew Morton <akpm@linux-foundation.org>
Subject: mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix

fix it for "mm: Device exclusive memory access".

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oliver Upton <oupton@google.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Wang Qing <wangqing@vivo.com>
Cc: Alistair Popple <apopple@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/memory.c~mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix
+++ a/mm/memory.c
@@ -850,8 +850,8 @@ copy_nonpresent_pte(struct mm_struct *ds
 		 * exclusive entries currently only support private writable
 		 * (ie. COW) mappings.
 		 */
-		VM_BUG_ON(!is_cow_mapping(vma->vm_flags));
-		if (try_restore_exclusive_pte(src_mm, src_pte, vma, addr))
+		VM_BUG_ON(!is_cow_mapping(dst_vma->vm_flags));
+		if (try_restore_exclusive_pte(src_mm, src_pte, dst_vma, addr))
 			return -EBUSY;
 		return -ENOENT;
 	}
_

Patches currently in -mm which might be from akpm@linux-foundation.org are

mm-hugetlb-fix-resv_huge_pages-underflow-on-uffdio_copy-fix.patch
mm.patch
mm-slub-kunit-add-a-kunit-test-for-slub-debugging-functionality-fix-2.patch
mm-gup-pack-has_pinned-in-mmf_has_pinned-checkpatch-fixes.patch
mm-memcg-optimize-user-context-object-stock-access-checkpatch-fixes.patch
mm-memcg-slab-create-a-new-set-of-kmalloc-cg-n-caches-v5-fix.patch
binfmt-remove-in-tree-usage-of-map_executable-fix.patch
mm-mmap-introduce-unlock_range-for-code-cleanup-fix.patch
powerpc-mm-book3s64-update-tlb-flush-routines-to-take-a-page-walk-cache-flush-argument-fix.patch
mm-mremap-use-range-flush-that-does-tlb-and-page-walk-cache-flush-fix.patch
mm-memory-failure-use-a-mutex-to-avoid-memory_failure-races-fix.patch
mm-memory_hotplug-disable-memmap_on_memory-when-hugetlb_free_vmemmap-enabled-fix.patch
mm-userfaultfd-fix-uffd-wp-special-cases-for-fork-fix.patch
mm-thp-check-total_mapcount-instead-of-page_mapcount-fix-fix.patch
nommu-remove-__gfp_highmem-in-vmalloc-vzalloc-checkpatch-fixes.patch
mm-madvise-introduce-madv_populate_readwrite-to-prefault-page-tables-checkpatch-fixes.patch
kernelh-split-out-panic-and-oops-helpers-fix.patch
lib-math-rational-add-kunit-test-cases-fix.patch
lib-decompressors-remove-set-but-not-used-variabled-level-fix.patch
linux-next-pre.patch
linux-next-post.patch
mm-introduce-memfd_secret-system-call-to-create-secret-memory-areas-fix.patch
module-add-printk-formats-to-add-module-build-id-to-stacktraces-fix.patch
module-add-printk-formats-to-add-module-build-id-to-stacktraces-fix-fix.patch
kernel-forkc-export-kernel_thread-to-modules.patch