From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Wed, 20 Jul 2022 02:18:01 +0000 (+0000)
Subject: mm/mprotect: use maple tree navigation instead of VMA linked list
X-Git-Tag: howlett/maple/20220906~12
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=7aa5dc55734ce0818ffd9e0cba7536742ec37eff;p=users%2Fjedix%2Flinux-maple.git

mm/mprotect: use maple tree navigation instead of VMA linked list

Switch to navigating the VMA list with the maple tree operators in
preparation for removing the linked list.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
---

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 3a4de77161e9f..85649490651b9 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -674,6 +674,7 @@ 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, 0, 0);
 
 	start = untagged_addr(start);
 
@@ -705,7 +706,8 @@ 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);
+	mas_set(&mas, start);
+	vma = mas_find(&mas, ULONG_MAX);
 	error = -ENOMEM;
 	if (!vma)
 		goto out;
@@ -731,7 +733,7 @@ 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 ; ; ) {
@@ -794,7 +796,7 @@ 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;