[PATCH v13 50/70] bpf: remove VMA linked list

Liam Howlett
2022-08-22T15:12:20Z

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

Use vma_next() and remove reference to the start of the linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
kernel/bpf/task_iter.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index 8c921799def4..1c8debd42dc9 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -299,8 +299,8 @@ struct bpf_iter_seq_task_vma_info {
};

enum bpf_task_vma_iter_find_op {
- task_vma_iter_first_vma, /* use mm->mmap */
- task_vma_iter_next_vma, /* use curr_vma->vm_next */
+ task_vma_iter_first_vma, /* use find_vma() with addr 0 */
+ task_vma_iter_next_vma, /* use vma_next() with curr_vma */
task_vma_iter_find_vma, /* use find_vma() to find next vma */
};

@@ -400,10 +400,10 @@ task_vma_seq_get_next(struct bpf_iter_seq_task_vma_info *info)

switch (op) {
case task_vma_iter_first_vma:
- curr_vma = curr_task->mm->mmap;
+ curr_vma = find_vma(curr_task->mm, 0);
break;
case task_vma_iter_next_vma:
- curr_vma = curr_vma->vm_next;
+ curr_vma = find_vma(curr_task->mm, curr_vma->vm_end);
break;
case task_vma_iter_find_vma:
/* We dropped mmap_lock so it is necessary to use find_vma
@@ -417,7 +417,7 @@ task_vma_seq_get_next(struct bpf_iter_seq_task_vma_info *info)
if (curr_vma &&
curr_vma->vm_start == info->prev_vm_start &&
curr_vma->vm_end == info->prev_vm_end)
- curr_vma = curr_vma->vm_next;
+ curr_vma = find_vma(curr_task->mm, curr_vma->vm_end);
break;
}
if (!curr_vma) {
--
2.35.1