linux-kernel - [PATCH v7 51/70] bpf: Remove VMA linked list

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Date:   Mon, 4 Apr 2022 14:35:52 +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>
Subject: [PATCH v7 51/70] bpf: Remove VMA linked list

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

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

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.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 d94696198ef8..9a0bbc808433 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -300,8 +300,8 @@ 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 */
 };
 
@@ -401,10 +401,10 @@ 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
@@ -418,7 +418,7 @@ 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) {
-- 
2.34.1