On 10/20/20 10:56 PM, Nikita Ermakov wrote:
If an unmapped region was found and the flag is MS_ASYNC (without
MS_INVALIDATE) there is nothing to do and the result would be always
-ENOMEM, so return immediately.
Signed-off-by: Nikita Ermakov <sh1r4s3@xxxxxxxxxxxxxxx>
---
mm/msync.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/msync.c b/mm/msync.c
index 69c6d2029531..ed20c3621d4c 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -69,6 +69,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
goto out_unlock;
/* Here start < vma->vm_end. */
if (start < vma->vm_start) {
I hoped it would become a code comment.
+ if (flags == MS_ASYNC)
+ goto out_unlock;
start = vma->vm_start;
if (start >= end)
goto out_unlock;
base-commit: 6824a8a9b4861d7df7ee132a952bdf6f84a99cb8
