Re: [PATCH v13 42/70] fs/proc/base: use maple tree iterators in place of linked list

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On Mon, 22 Aug 2022, Liam Howlett wrote:

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

-ENOCHANGELOG.


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





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