The quilt patch titled
Subject: userfaultfd: use maple tree iterator to iterate VMAs
has been removed from the -mm tree. Its filename was
userfaultfd-use-maple-tree-iterator-to-iterate-vmas.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: userfaultfd: use maple tree iterator to iterate VMAs
Date: Tue, 6 Sep 2022 19:48:57 +0000
Don't use the mm_struct linked list or the vma->vm_next in prep for
removal.
Link: https://lkml.kernel.org/r/20220906194824.2110408-45-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Tested-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: SeongJae Park <sj@xxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/userfaultfd.c | 62 +++++++++++++++++++++-----------
include/linux/userfaultfd_k.h | 7 +--
mm/mmap.c | 2 -
3 files changed, 46 insertions(+), 25 deletions(-)
--- a/fs/userfaultfd.c~userfaultfd-use-maple-tree-iterator-to-iterate-vmas
+++ a/fs/userfaultfd.c
@@ -611,14 +611,16 @@ static void userfaultfd_event_wait_compl
if (release_new_ctx) {
struct vm_area_struct *vma;
struct mm_struct *mm = release_new_ctx->mm;
+ VMA_ITERATOR(vmi, mm, 0);
/* the various vma->vm_userfaultfd_ctx still points to it */
mmap_write_lock(mm);
- for (vma = mm->mmap; vma; vma = vma->vm_next)
+ for_each_vma(vmi, vma) {
if (vma->vm_userfaultfd_ctx.ctx == release_new_ctx) {
vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
vma->vm_flags &= ~__VM_UFFD_FLAGS;
}
+ }
mmap_write_unlock(mm);
userfaultfd_ctx_put(release_new_ctx);
@@ -799,11 +801,13 @@ static bool has_unmap_ctx(struct userfau
return false;
}
-int userfaultfd_unmap_prep(struct vm_area_struct *vma,
- unsigned long start, unsigned long end,
- struct list_head *unmaps)
+int userfaultfd_unmap_prep(struct mm_struct *mm, unsigned long start,
+ unsigned long end, struct list_head *unmaps)
{
- for ( ; vma && vma->vm_start < end; vma = vma->vm_next) {
+ VMA_ITERATOR(vmi, mm, start);
+ struct vm_area_struct *vma;
+
+ for_each_vma_range(vmi, vma, end) {
struct userfaultfd_unmap_ctx *unmap_ctx;
struct userfaultfd_ctx *ctx = vma->vm_userfaultfd_ctx.ctx;
@@ -853,6 +857,7 @@ static int userfaultfd_release(struct in
/* len == 0 means wake all */
struct userfaultfd_wake_range range = { .len = 0, };
unsigned long new_flags;
+ MA_STATE(mas, &mm->mm_mt, 0, 0);
WRITE_ONCE(ctx->released, true);
@@ -869,7 +874,7 @@ static int userfaultfd_release(struct in
*/
mmap_write_lock(mm);
prev = NULL;
- for (vma = mm->mmap; vma; vma = vma->vm_next) {
+ mas_for_each(&mas, vma, ULONG_MAX) {
cond_resched();
BUG_ON(!!vma->vm_userfaultfd_ctx.ctx ^
!!(vma->vm_flags & __VM_UFFD_FLAGS));
@@ -883,10 +888,13 @@ static int userfaultfd_release(struct in
vma->vm_file, vma->vm_pgoff,
vma_policy(vma),
NULL_VM_UFFD_CTX, anon_vma_name(vma));
- if (prev)
+ if (prev) {
+ mas_pause(&mas);
vma = prev;
- else
+ } else {
prev = vma;
+ }
+
vma->vm_flags = new_flags;
vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
}
@@ -1268,6 +1276,7 @@ static int userfaultfd_register(struct u
bool found;
bool basic_ioctls;
unsigned long start, end, vma_end;
+ MA_STATE(mas, &mm->mm_mt, 0, 0);
user_uffdio_register = (struct uffdio_register __user *) arg;
@@ -1310,7 +1319,8 @@ static int userfaultfd_register(struct u
goto out;
mmap_write_lock(mm);
- vma = find_vma_prev(mm, start, &prev);
+ mas_set(&mas, start);
+ vma = mas_find(&mas, ULONG_MAX);
if (!vma)
goto out_unlock;
@@ -1335,7 +1345,7 @@ static int userfaultfd_register(struct u
*/
found = false;
basic_ioctls = false;
- for (cur = vma; cur && cur->vm_start < end; cur = cur->vm_next) {
+ for (cur = vma; cur; cur = mas_next(&mas, end - 1)) {
cond_resched();
BUG_ON(!!cur->vm_userfaultfd_ctx.ctx ^
@@ -1395,8 +1405,10 @@ static int userfaultfd_register(struct u
}
BUG_ON(!found);
- if (vma->vm_start < start)
- prev = vma;
+ mas_set(&mas, start);
+ prev = mas_prev(&mas, 0);
+ if (prev != vma)
+ mas_next(&mas, ULONG_MAX);
ret = 0;
do {
@@ -1426,6 +1438,8 @@ static int userfaultfd_register(struct u
((struct vm_userfaultfd_ctx){ ctx }),
anon_vma_name(vma));
if (prev) {
+ /* vma_merge() invalidated the mas */
+ mas_pause(&mas);
vma = prev;
goto next;
}
@@ -1433,11 +1447,15 @@ static int userfaultfd_register(struct u
ret = split_vma(mm, vma, start, 1);
if (ret)
break;
+ /* split_vma() invalidated the mas */
+ mas_pause(&mas);
}
if (vma->vm_end > end) {
ret = split_vma(mm, vma, end, 0);
if (ret)
break;
+ /* split_vma() invalidated the mas */
+ mas_pause(&mas);
}
next:
/*
@@ -1454,8 +1472,8 @@ static int userfaultfd_register(struct u
skip:
prev = vma;
start = vma->vm_end;
- vma = vma->vm_next;
- } while (vma && vma->vm_start < end);
+ vma = mas_next(&mas, end - 1);
+ } while (vma);
out_unlock:
mmap_write_unlock(mm);
mmput(mm);
@@ -1499,6 +1517,7 @@ static int userfaultfd_unregister(struct
bool found;
unsigned long start, end, vma_end;
const void __user *buf = (void __user *)arg;
+ MA_STATE(mas, &mm->mm_mt, 0, 0);
ret = -EFAULT;
if (copy_from_user(&uffdio_unregister, buf, sizeof(uffdio_unregister)))
@@ -1517,7 +1536,8 @@ static int userfaultfd_unregister(struct
goto out;
mmap_write_lock(mm);
- vma = find_vma_prev(mm, start, &prev);
+ mas_set(&mas, start);
+ vma = mas_find(&mas, ULONG_MAX);
if (!vma)
goto out_unlock;
@@ -1542,7 +1562,7 @@ static int userfaultfd_unregister(struct
*/
found = false;
ret = -EINVAL;
- for (cur = vma; cur && cur->vm_start < end; cur = cur->vm_next) {
+ for (cur = vma; cur; cur = mas_next(&mas, end - 1)) {
cond_resched();
BUG_ON(!!cur->vm_userfaultfd_ctx.ctx ^
@@ -1562,8 +1582,10 @@ static int userfaultfd_unregister(struct
}
BUG_ON(!found);
- if (vma->vm_start < start)
- prev = vma;
+ mas_set(&mas, start);
+ prev = mas_prev(&mas, 0);
+ if (prev != vma)
+ mas_next(&mas, ULONG_MAX);
ret = 0;
do {
@@ -1632,8 +1654,8 @@ static int userfaultfd_unregister(struct
skip:
prev = vma;
start = vma->vm_end;
- vma = vma->vm_next;
- } while (vma && vma->vm_start < end);
+ vma = mas_next(&mas, end - 1);
+ } while (vma);
out_unlock:
mmap_write_unlock(mm);
mmput(mm);
--- a/include/linux/userfaultfd_k.h~userfaultfd-use-maple-tree-iterator-to-iterate-vmas
+++ a/include/linux/userfaultfd_k.h
@@ -175,9 +175,8 @@ extern bool userfaultfd_remove(struct vm
unsigned long start,
unsigned long end);
-extern int userfaultfd_unmap_prep(struct vm_area_struct *vma,
- unsigned long start, unsigned long end,
- struct list_head *uf);
+extern int userfaultfd_unmap_prep(struct mm_struct *mm, unsigned long start,
+ unsigned long end, struct list_head *uf);
extern void userfaultfd_unmap_complete(struct mm_struct *mm,
struct list_head *uf);
@@ -258,7 +257,7 @@ static inline bool userfaultfd_remove(st
return true;
}
-static inline int userfaultfd_unmap_prep(struct vm_area_struct *vma,
+static inline int userfaultfd_unmap_prep(struct mm_struct *mm,
unsigned long start, unsigned long end,
struct list_head *uf)
{
--- a/mm/mmap.c~userfaultfd-use-maple-tree-iterator-to-iterate-vmas
+++ a/mm/mmap.c
@@ -2545,7 +2545,7 @@ do_mas_align_munmap(struct ma_state *mas
* split, despite we could. This is unlikely enough
* failure that it's not worth optimizing it for.
*/
- error = userfaultfd_unmap_prep(vma, start, end, uf);
+ error = userfaultfd_unmap_prep(mm, start, end, uf);
if (error)
goto userfaultfd_error;
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
