[PATCH] fs/proc/base: use maple tree iterators in place of linked list

[Liam Howlett]

From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>

Use mas_for_each to iterate the list of VMAs instead of a for loop
across the linked list.

Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
 fs/proc/base.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 93f7e3d971e4..0b72a6d8aac3 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2350,6 +2350,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
 	GENRADIX(struct map_files_info) fa;
 	struct map_files_info *p;
 	int ret;
+	MA_STATE(mas, NULL, 0, 0);
 
 	genradix_init(&fa);
 
@@ -2377,6 +2378,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
 	}
 
 	nr_files = 0;
+	mas.tree = &mm->mm_mt;
 
 	/*
 	 * We need two passes here:
@@ -2388,7 +2390,8 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
 	 * routine might require mmap_lock taken in might_fault().
 	 */
 
-	for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
+	pos = 2;
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		if (!vma->vm_file)
 			continue;
 		if (++pos <= ctx->pos)
-- 
2.35.1