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From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
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        Andrew Morton <akpm@linux-foundation.org>,
        Yu Zhao <yuzhao@google.com>, Hugh Dickins <hughd@google.com>
Subject: [PATCH v11 42/69] fs/proc/base: use maple tree iterators in place of
 linked list
Thread-Topic: [PATCH v11 42/69] fs/proc/base: use maple tree iterators in
 place of linked list
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Date:   Sun, 17 Jul 2022 02:46:51 +0000
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From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

Link: https://lkml.kernel.org/r/20220504011345.662299-27-Liam.Howlett@oracl=
e.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-43-Liam.Howlett@orac=
le.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 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 8dfa36a99c74..617816168748 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2322,6 +2322,7 @@ 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);
=20
 	genradix_init(&fa);
=20
@@ -2349,6 +2350,7 @@ proc_map_files_readdir(struct file *file, struct dir_=
context *ctx)
 	}
=20
 	nr_files =3D 0;
+	mas.tree =3D &mm->mm_mt;
=20
 	/*
 	 * We need two passes here:
@@ -2360,7 +2362,8 @@ proc_map_files_readdir(struct file *file, struct dir_=
context *ctx)
 	 * routine might require mmap_lock taken in might_fault().
 	 */
=20
-	for (vma =3D mm->mmap, pos =3D 2; vma; vma =3D vma->vm_next) {
+	pos =3D 2;
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		if (!vma->vm_file)
 			continue;
 		if (++pos <=3D ctx->pos)
--=20
2.35.1