[PATCH] add kernel log when allocate a new virtual mapping failed because of overcommit

[Xu Huijie <xuhuijie2@xxxxxxxxxx>]

From: xuhuijie <xuhuijie2@xxxxxxxxxx>

diff --git a/mm/mmap.c b/mm/mmap.c
index aa9de981b..f019fc6b2 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1758,8 +1758,10 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 	 */
 	if (accountable_mapping(file, vm_flags)) {
 		charged = len >> PAGE_SHIFT;
-		if (security_vm_enough_memory_mm(mm, charged))
+		if (security_vm_enough_memory_mm(mm, charged)) {
+			pr_err("Unable to allocate a new virtual mapping because of the overcommit\n");
 			return -ENOMEM;
+		}
 		vm_flags |= VM_ACCOUNT;
 	}
 
-- 
2.23.0