summaryrefslogtreecommitdiff
path: root/mm/mmap.c
diff options
context:
space:
mode:
authorMiaohe Lin <linmiaohe@huawei.com>2020-10-13 16:54:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-13 18:38:31 -0700
commitcf508b58457cfe51b168d49ea6c79a221900d354 (patch)
treefcbc92a3ea32c26584997e9b67443e325ab274af /mm/mmap.c
parent0fc48a6e213ab8e4033d26bd8333ee8558f210f6 (diff)
mm: use helper function mapping_allow_writable()
Commit 4bb5f5d9395b ("mm: allow drivers to prevent new writable mappings") changed i_mmap_writable from unsigned int to atomic_t and add the helper function mapping_allow_writable() to atomic_inc i_mmap_writable. But it forgot to use this helper function in dup_mmap() and __vma_link_file(). Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Christian Brauner <christian.brauner@ubuntu.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Christian Kellner <christian@kellner.me> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Adrian Reber <areber@redhat.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Aleksa Sarai <cyphar@cyphar.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20200917112736.7789-1-linmiaohe@huawei.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 19cd69524837..7799a3f2e483 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -621,7 +621,7 @@ static void __vma_link_file(struct vm_area_struct *vma)
if (vma->vm_flags & VM_DENYWRITE)
atomic_dec(&file_inode(file)->i_writecount);
if (vma->vm_flags & VM_SHARED)
- atomic_inc(&mapping->i_mmap_writable);
+ mapping_allow_writable(mapping);
flush_dcache_mmap_lock(mapping);
vma_interval_tree_insert(vma, &mapping->i_mmap);