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Subject[PATCH v2 36/61] fs/proc/base: Use maple tree iterators in place of linked list
Date
From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
fs/proc/base.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 533d5836eb9a..4f7e7c8abfd8 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2318,6 +2318,7 @@ 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);

@@ -2343,8 +2344,10 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
mmput(mm);
goto out_put_task;
}
+ rcu_read_lock();

nr_files = 0;
+ mas.tree = &mm->mm_mt;

/*
* We need two passes here:
@@ -2356,7 +2359,8 @@ 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)
@@ -2374,6 +2378,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
p->end = vma->vm_end;
p->mode = vma->vm_file->f_mode;
}
+ rcu_read_unlock();
mmap_read_unlock(mm);
mmput(mm);

--
2.30.2
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