linux-kernel - [PATCH 62/94] fs/binfmt_elf: Use maple tree iterators for fill_files

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Date:   Wed, 28 Apr 2021 15:36:19 +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>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <walken.cr@...il.com>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH 62/94] fs/binfmt_elf: Use maple tree iterators for
 fill_files_note()

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

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 187b3f2b9202..264e37903949 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1612,6 +1612,7 @@ static int fill_files_note(struct memelfnote *note)
 	user_long_t *data;
 	user_long_t *start_end_ofs;
 	char *name_base, *name_curpos;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
 
 	/* *Estimated* file count and total data size needed */
 	count = mm->map_count;
@@ -1636,7 +1637,8 @@ static int fill_files_note(struct memelfnote *note)
 	name_base = name_curpos = ((char *)data) + names_ofs;
 	remaining = size - names_ofs;
 	count = 0;
-	for (vma = mm->mmap; vma != NULL; vma = vma->vm_next) {
+	rcu_read_lock();
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		struct file *file;
 		const char *filename;
 
@@ -1665,6 +1667,7 @@ static int fill_files_note(struct memelfnote *note)
 		*start_end_ofs++ = vma->vm_pgoff;
 		count++;
 	}
+	rcu_read_unlock();
 
 	/* Now we know exact count of files, can store it */
 	data[0] = count;
-- 
2.30.2