The patch titled
Subject: mm/msync: exit early when the flags is an MS_ASYNC and start < vm_start
has been removed from the -mm tree. Its filename was
mm-msync-exit-early-when-the-flags-is-an-ms_async-and-start-vm_start.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Nikita Ermakov <sh1r4s3@xxxxxxxxxxxxxxx>
Subject: mm/msync: exit early when the flags is an MS_ASYNC and start < vm_start
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.
Link: https://lkml.kernel.org/r/20201025092901.56399-1-sh1r4s3@xxxxxxxxxxxxxxx
Signed-off-by: Nikita Ermakov <sh1r4s3@xxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/msync.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/mm/msync.c~mm-msync-exit-early-when-the-flags-is-an-ms_async-and-start-vm_start
+++ a/mm/msync.c
@@ -55,7 +55,9 @@ SYSCALL_DEFINE3(msync, unsigned long, st
goto out;
/*
* If the interval [start,end) covers some unmapped address ranges,
- * just ignore them, but return -ENOMEM at the end.
+ * just ignore them, but return -ENOMEM at the end. Besides, if the
+ * flag is MS_ASYNC (w/o MS_INVALIDATE) the result would be -ENOMEM
+ * anyway and there is nothing left to do, so return immediately.
*/
mmap_read_lock(mm);
vma = find_vma(mm, start);
@@ -69,6 +71,8 @@ SYSCALL_DEFINE3(msync, unsigned long, st
goto out_unlock;
/* Here start < vma->vm_end. */
if (start < vma->vm_start) {
+ if (flags == MS_ASYNC)
+ goto out_unlock;
start = vma->vm_start;
if (start >= end)
goto out_unlock;
_
Patches currently in -mm which might be from sh1r4s3@xxxxxxxxxxxxxxx are
