[PATCH v2 33/61] fs/binfmt_elf: Use maple tree iterators for fill_files_note()

[Liam Howlett]

From: "Liam R. Howlett" <Liam.Howlett at Oracle.com>

Signed-off-by: Liam R. Howlett <Liam.Howlett at Oracle.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 439ed81e755a..4a13324aaba1 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1614,6 +1614,7 @@ 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;
@@ -1638,7 +1639,8 @@ 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;
 
@@ -1667,6 +1669,7 @@ 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