linux-kernel - [PATCH v12 34/69] s390: remove vma linked list walks

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Message-ID: <20220720021727.17018-35-Liam.Howlett@oracle.com>
Date:   Wed, 20 Jul 2022 02:17:55 +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>,
        Hugh Dickins <hughd@...gle.com>
CC:     Yu Zhao <yuzhao@...gle.com>
Subject: [PATCH v12 34/69] s390: remove vma linked list walks

From: "Matthew Wilcox (Oracle)" <willy@...radead.org>

Use the VMA iterator instead.

Link: https://lkml.kernel.org/r/20220504011345.662299-19-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-35-Liam.Howlett@oracle.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: David Howells <dhowells@...hat.com>
Cc: SeongJae Park <sj@...nel.org>
Cc: Will Deacon <will@...nel.org>
Cc: Davidlohr Bueso <dave@...olabs.net>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
 arch/s390/kernel/vdso.c | 3 ++-
 arch/s390/mm/gmap.c     | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 5075cde77b29..535099f2736d 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -69,10 +69,11 @@ static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
 int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
 {
 	struct mm_struct *mm = task->mm;
+	VMA_ITERATOR(vmi, mm, 0);
 	struct vm_area_struct *vma;
 
 	mmap_read_lock(mm);
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+	for_each_vma(vmi, vma) {
 		unsigned long size = vma->vm_end - vma->vm_start;
 
 		if (!vma_is_special_mapping(vma, &vvar_mapping))
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index b8ae4a4aa2ba..6e24f337eac0 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -2515,8 +2515,9 @@ static const struct mm_walk_ops thp_split_walk_ops = {
 static inline void thp_split_mm(struct mm_struct *mm)
 {
 	struct vm_area_struct *vma;
+	VMA_ITERATOR(vmi, mm, 0);
 
-	for (vma = mm->mmap; vma != NULL; vma = vma->vm_next) {
+	for_each_vma(vmi, vma) {
 		vma->vm_flags &= ~VM_HUGEPAGE;
 		vma->vm_flags |= VM_NOHUGEPAGE;
 		walk_page_vma(vma, &thp_split_walk_ops, NULL);
@@ -2584,8 +2585,9 @@ int gmap_mark_unmergeable(void)
 	struct mm_struct *mm = current->mm;
 	struct vm_area_struct *vma;
 	int ret;
+	VMA_ITERATOR(vmi, mm, 0);
 
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+	for_each_vma(vmi, vma) {
 		ret = ksm_madvise(vma, vma->vm_start, vma->vm_end,
 				  MADV_UNMERGEABLE, &vma->vm_flags);
 		if (ret)
-- 
2.35.1