Thread (69 messages) 69 messages, 3 authors, 2021-08-31
STALE1755d
Revisions (3)
  1. v2 current
  2. v3 [diff vs current]
  3. v4 [diff vs current]

[PATCH v2 24/61] arch/arm64: Remove mmap linked list from vdso.

From: Liam Howlett <hidden>
Date: 2021-08-17 15:55:45
Also in: lkml
Subsystem: arm64 port (aarch64 architecture), the rest · Maintainers: Catalin Marinas, Will Deacon, Linus Torvalds

From: "Liam R. Howlett" <redacted>

Start using the maple tree

Signed-off-by: Liam R. Howlett <redacted>
---
 arch/arm64/kernel/vdso.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c
index a61fc4f989b3..57ea81fbe04b 100644
--- a/arch/arm64/kernel/vdso.c
+++ b/arch/arm64/kernel/vdso.c
@@ -136,10 +136,12 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
 {
 	struct mm_struct *mm = task->mm;
 	struct vm_area_struct *vma;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
 
 	mmap_read_lock(mm);
 
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+	rcu_read_lock();
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		unsigned long size = vma->vm_end - vma->vm_start;
 
 		if (vma_is_special_mapping(vma, vdso_info[VDSO_ABI_AA64].dm))
@@ -149,6 +151,7 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
 			zap_page_range(vma, vma->vm_start, size);
 #endif
 	}
+	rcu_read_unlock();
 
 	mmap_read_unlock(mm);
 	return 0;
-- 
2.30.2
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