From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Mon, 4 Jan 2021 20:00:14 +0000 (-0500)
Subject: mm/mlock: Use maple tree iterators instead of vma linked list
X-Git-Tag: howlett/maple_spf/20210120~11
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=663d55a1f4ec0fcf642b5310bd1478db06893137;p=users%2Fjedix%2Flinux-maple.git

mm/mlock: Use maple tree iterators instead of vma linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/mm/mlock.c b/mm/mlock.c
index 55b3b3672977..8194507c9710 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -562,6 +562,7 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
 	unsigned long nstart, end, tmp;
 	struct vm_area_struct * vma, * prev;
 	int error;
+	MA_STATE(mas, &current->mm->mm_mt, start, start);
 
 	VM_BUG_ON(offset_in_page(start));
 	VM_BUG_ON(len != PAGE_ALIGN(len));
@@ -570,11 +571,11 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
 		return -EINVAL;
 	if (end == start)
 		return 0;
-	vma = find_vma(current->mm, start);
-	if (!vma || vma->vm_start > start)
+	vma = mas_walk(&mas);
+	if (!vma)
 		return -ENOMEM;
 
-	prev = vma->vm_prev;
+	prev = mas_prev(&mas, 0);
 	if (start > vma->vm_start)
 		prev = vma;
 
@@ -596,7 +597,7 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
 		if (nstart >= end)
 			break;
 
-		vma = prev->vm_next;
+		vma = vma_next(prev->vm_mm, prev);
 		if (!vma || vma->vm_start != nstart) {
 			error = -ENOMEM;
 			break;
@@ -617,15 +618,12 @@ static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm,
 {
 	struct vm_area_struct *vma;
 	unsigned long count = 0;
+	MA_STATE(mas, &mm->mm_mt, start, start);
 
 	if (mm == NULL)
 		mm = current->mm;
 
-	vma = find_vma(mm, start);
-	if (vma == NULL)
-		vma = mm->mmap;
-
-	for (; vma ; vma = vma->vm_next) {
+	mas_for_each(&mas, vma, start + len) {
 		if (start >= vma->vm_end)
 			continue;
 		if (start + len <=  vma->vm_start)
@@ -740,6 +738,7 @@ static int apply_mlockall_flags(int flags)
 {
 	struct vm_area_struct * vma, * prev = NULL;
 	vm_flags_t to_add = 0;
+	MA_STATE(mas, &current->mm->mm_mt, 0, 0);
 
 	current->mm->def_flags &= VM_LOCKED_CLEAR_MASK;
 	if (flags & MCL_FUTURE) {
@@ -758,7 +757,7 @@ static int apply_mlockall_flags(int flags)
 			to_add |= VM_LOCKONFAULT;
 	}
 
-	for (vma = current->mm->mmap; vma ; vma = prev->vm_next) {
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		vm_flags_t newflags;
 
 		newflags = vma->vm_flags & VM_LOCKED_CLEAR_MASK;
@@ -766,6 +765,7 @@ static int apply_mlockall_flags(int flags)
 
 		/* Ignore errors */
 		mlock_fixup(vma, &prev, vma->vm_start, vma->vm_end, newflags);
+		mas_pause(&mas);
 		cond_resched();
 	}
 out: