From: Liam R. Howlett <Liam.Howlett@oracle.com>
Date: Thu, 21 Apr 2022 22:01:28 +0000 (-0400)
Subject: convert mmap_region to use prealloc
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=1c74c31e185cf84d0dc95bfa8228d5781df85921;p=users%2Fjedix%2Flinux-maple.git

convert mmap_region to use prealloc

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---

diff --git a/mm/mmap.c b/mm/mmap.c
index 6394d0134624..90d50787c4fd 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2685,6 +2685,14 @@ cannot_expand:
 			goto free_vma;
 	}
 
+	if (mas_preallocate(&mas, vma, GFP_KERNEL)) {
+		error = -ENOMEM;
+		if (file)
+			goto unmap_and_free_vma;
+		else
+			goto free_vma;
+	}
+
 	if (vma->vm_file)
 		i_mmap_lock_write(vma->vm_file->f_mapping);