diff mbox series

[v8,59/70] mm/mprotect: use maple tree navigation instead of vma linked list

Message ID 20220426150616.3937571-60-Liam.Howlett@oracle.com (mailing list archive)
State New
Headers show
Series Introducing the Maple Tree | expand

Commit Message

Liam R. Howlett April 26, 2022, 3:06 p.m. UTC 
From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
---
 mm/mprotect.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 20a46f21cca8..fbb248caf8aa 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -550,6 +550,7 @@  static int do_mprotect_pkey(unsigned long start, size_t len,
 	const bool rier = (current->personality & READ_IMPLIES_EXEC) &&
 				(prot & PROT_READ);
 	struct mmu_gather tlb;
+	MA_STATE(mas, &current->mm->mm_mt, start, start);
 
 	start = untagged_addr(start);
 
@@ -581,7 +582,7 @@  static int do_mprotect_pkey(unsigned long start, size_t len,
 	if ((pkey != -1) && !mm_pkey_is_allocated(current->mm, pkey))
 		goto out;
 
-	vma = find_vma(current->mm, start);
+	vma = mas_find(&mas, ULONG_MAX);
 	error = -ENOMEM;
 	if (!vma)
 		goto out;
@@ -607,7 +608,7 @@  static int do_mprotect_pkey(unsigned long start, size_t len,
 	if (start > vma->vm_start)
 		prev = vma;
 	else
-		prev = vma->vm_prev;
+		prev = mas_prev(&mas, 0);
 
 	tlb_gather_mmu(&tlb, current->mm);
 	for (nstart = start ; ; ) {
@@ -670,7 +671,7 @@  static int do_mprotect_pkey(unsigned long start, size_t len,
 		if (nstart >= end)
 			break;
 
-		vma = prev->vm_next;
+		vma = find_vma(current->mm, prev->vm_end);
 		if (!vma || vma->vm_start != nstart) {
 			error = -ENOMEM;
 			break;