linux-kernel - [PATCH v6 44/71] fs/proc/base: Use maple tree iterators in place of linked list

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Message-ID: <20220215144241.3812052-44-Liam.Howlett@oracle.com>
Date:   Tue, 15 Feb 2022 14:43:19 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v6 44/71] fs/proc/base: Use maple tree iterators in place of
 linked list

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 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 d654ce7150fd..a62851782aa5 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2323,6 +2323,7 @@ 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);
 
@@ -2350,6 +2351,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
 	}
 
 	nr_files = 0;
+	mas.tree = &mm->mm_mt;
 
 	/*
 	 * We need two passes here:
@@ -2361,7 +2363,8 @@ 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)
-- 
2.34.1