VM: add "vm_munmap()" helper function

Like the vm_brk() function, this is the same as "do_munmap()", except it
does the VM locking for the caller.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 5 deletions

diff --git a/fs/aio.c b/fs/aio.c
index da887604dfc5..99bd790e8cd2 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -92,11 +92,8 @@ static void aio_free_ring(struct kioctx *ctx)
         for (i=0; i<info->nr_pages; i++)
                 put_page(info->ring_pages[i]);
 
-        if (info->mmap_size) {
-                down_write(&ctx->mm->mmap_sem);
-                do_munmap(ctx->mm, info->mmap_base, info->mmap_size);
-                up_write(&ctx->mm->mmap_sem);
-        }
+        if (info->mmap_size)
+                vm_munmap(ctx->mm, info->mmap_base, info->mmap_size);
 
         if (info->ring_pages && info->ring_pages != info->internal_pages)
                 kfree(info->ring_pages);