fs/proc/base: Use maple tree iterators in place of linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

diff --git a/fs/proc/base.c b/fs/proc/base.c
index fd46d8dd0cf4d1d1f07b809d9b6e8a2cbb978c10..8f62ab2e77e51de026554b42c1fa25c137d4b990 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2315,6 +2315,7 @@ 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);
 
@@ -2340,8 +2341,10 @@ 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:
@@ -2353,7 +2356,8 @@ 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)
@@ -2371,6 +2375,7 @@ 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);