The patch titled
Subject: mm: modify vma_iter_store{_gfp} to indicate if it's storing a new vma
has been added to the -mm mm-unstable branch. Its filename is
mm-modify-vma_iter_store_gfp-to-indicate-if-its-storing-a-new-vma.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-modify-vma_iter_store_gfp-to-indicate-if-its-storing-a-new-vma.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm: modify vma_iter_store{_gfp} to indicate if it's storing a new vma
Date: Thu, 26 Dec 2024 09:06:56 -0800
vma_iter_store() functions can be used both when adding a new vma and when
updating an existing one. However for existing ones we do not need to
mark them attached as they are already marked that way. Add a parameter
to distinguish the usage and skip vma_mark_attached() when not needed.
Link: https://lkml.kernel.org/r/20241226170710.1159679-5-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Hillf Danton <hdanton@xxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: kernel test robot <oliver.sang@xxxxxxxxx>
Cc: Klara Modin <klarasmodin@xxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Lokesh Gidra <lokeshgidra@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Cc: Mateusz Guzik <mjguzik@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Shakeel Butt <shakeel.butt@xxxxxxxxx>
Cc: Sourav Panda <souravpanda@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 12 ++++++++++++
mm/nommu.c | 4 ++--
mm/vma.c | 16 ++++++++--------
mm/vma.h | 13 +++++++++----
4 files changed, 31 insertions(+), 14 deletions(-)
--- a/include/linux/mm.h~mm-modify-vma_iter_store_gfp-to-indicate-if-its-storing-a-new-vma
+++ a/include/linux/mm.h
@@ -821,6 +821,16 @@ static inline void vma_assert_locked(str
vma_assert_write_locked(vma);
}
+static inline void vma_assert_attached(struct vm_area_struct *vma)
+{
+ VM_BUG_ON_VMA(vma->detached, vma);
+}
+
+static inline void vma_assert_detached(struct vm_area_struct *vma)
+{
+ VM_BUG_ON_VMA(!vma->detached, vma);
+}
+
static inline void vma_mark_attached(struct vm_area_struct *vma)
{
vma->detached = false;
@@ -866,6 +876,8 @@ static inline void vma_end_read(struct v
static inline void vma_start_write(struct vm_area_struct *vma) {}
static inline void vma_assert_write_locked(struct vm_area_struct *vma)
{ mmap_assert_write_locked(vma->vm_mm); }
+static inline void vma_assert_attached(struct vm_area_struct *vma) {}
+static inline void vma_assert_detached(struct vm_area_struct *vma) {}
static inline void vma_mark_attached(struct vm_area_struct *vma) {}
static inline void vma_mark_detached(struct vm_area_struct *vma) {}
--- a/mm/nommu.c~mm-modify-vma_iter_store_gfp-to-indicate-if-its-storing-a-new-vma
+++ a/mm/nommu.c
@@ -1191,7 +1191,7 @@ share:
setup_vma_to_mm(vma, current->mm);
current->mm->map_count++;
/* add the VMA to the tree */
- vma_iter_store(&vmi, vma);
+ vma_iter_store(&vmi, vma, true);
/* we flush the region from the icache only when the first executable
* mapping of it is made */
@@ -1356,7 +1356,7 @@ static int split_vma(struct vma_iterator
setup_vma_to_mm(vma, mm);
setup_vma_to_mm(new, mm);
- vma_iter_store(vmi, new);
+ vma_iter_store(vmi, new, true);
mm->map_count++;
return 0;
--- a/mm/vma.c~mm-modify-vma_iter_store_gfp-to-indicate-if-its-storing-a-new-vma
+++ a/mm/vma.c
@@ -306,7 +306,7 @@ static void vma_complete(struct vma_prep
* us to insert it before dropping the locks
* (it may either follow vma or precede it).
*/
- vma_iter_store(vmi, vp->insert);
+ vma_iter_store(vmi, vp->insert, true);
mm->map_count++;
}
@@ -660,14 +660,14 @@ static int commit_merge(struct vma_merge
vma_set_range(vmg->vma, vmg->start, vmg->end, vmg->pgoff);
if (expanded)
- vma_iter_store(vmg->vmi, vmg->vma);
+ vma_iter_store(vmg->vmi, vmg->vma, false);
if (adj_start) {
adjust->vm_start += adj_start;
adjust->vm_pgoff += PHYS_PFN(adj_start);
if (adj_start < 0) {
WARN_ON(expanded);
- vma_iter_store(vmg->vmi, adjust);
+ vma_iter_store(vmg->vmi, adjust, false);
}
}
@@ -1689,7 +1689,7 @@ int vma_link(struct mm_struct *mm, struc
return -ENOMEM;
vma_start_write(vma);
- vma_iter_store(&vmi, vma);
+ vma_iter_store(&vmi, vma, true);
vma_link_file(vma);
mm->map_count++;
validate_mm(mm);
@@ -2368,7 +2368,7 @@ static int __mmap_new_vma(struct mmap_st
/* Lock the VMA since it is modified after insertion into VMA tree */
vma_start_write(vma);
- vma_iter_store(vmi, vma);
+ vma_iter_store(vmi, vma, true);
map->mm->map_count++;
vma_link_file(vma);
@@ -2542,7 +2542,7 @@ int do_brk_flags(struct vma_iterator *vm
vm_flags_init(vma, flags);
vma->vm_page_prot = vm_get_page_prot(flags);
vma_start_write(vma);
- if (vma_iter_store_gfp(vmi, vma, GFP_KERNEL))
+ if (vma_iter_store_gfp(vmi, vma, GFP_KERNEL, true))
goto mas_store_fail;
mm->map_count++;
@@ -2785,7 +2785,7 @@ int expand_upwards(struct vm_area_struct
anon_vma_interval_tree_pre_update_vma(vma);
vma->vm_end = address;
/* Overwrite old entry in mtree. */
- vma_iter_store(&vmi, vma);
+ vma_iter_store(&vmi, vma, false);
anon_vma_interval_tree_post_update_vma(vma);
perf_event_mmap(vma);
@@ -2865,7 +2865,7 @@ int expand_downwards(struct vm_area_stru
vma->vm_start = address;
vma->vm_pgoff -= grow;
/* Overwrite old entry in mtree. */
- vma_iter_store(&vmi, vma);
+ vma_iter_store(&vmi, vma, false);
anon_vma_interval_tree_post_update_vma(vma);
perf_event_mmap(vma);
--- a/mm/vma.h~mm-modify-vma_iter_store_gfp-to-indicate-if-its-storing-a-new-vma
+++ a/mm/vma.h
@@ -145,7 +145,7 @@ __must_check int vma_shrink(struct vma_i
unsigned long start, unsigned long end, pgoff_t pgoff);
static inline int vma_iter_store_gfp(struct vma_iterator *vmi,
- struct vm_area_struct *vma, gfp_t gfp)
+ struct vm_area_struct *vma, gfp_t gfp, bool new_vma)
{
if (vmi->mas.status != ma_start &&
@@ -157,7 +157,10 @@ static inline int vma_iter_store_gfp(str
if (unlikely(mas_is_err(&vmi->mas)))
return -ENOMEM;
- vma_mark_attached(vma);
+ if (new_vma)
+ vma_mark_attached(vma);
+ vma_assert_attached(vma);
+
return 0;
}
@@ -366,7 +369,7 @@ static inline struct vm_area_struct *vma
/* Store a VMA with preallocated memory */
static inline void vma_iter_store(struct vma_iterator *vmi,
- struct vm_area_struct *vma)
+ struct vm_area_struct *vma, bool new_vma)
{
#if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
@@ -390,7 +393,9 @@ static inline void vma_iter_store(struct
__mas_set_range(&vmi->mas, vma->vm_start, vma->vm_end - 1);
mas_store_prealloc(&vmi->mas, vma);
- vma_mark_attached(vma);
+ if (new_vma)
+ vma_mark_attached(vma);
+ vma_assert_attached(vma);
}
static inline unsigned long vma_iter_addr(struct vma_iterator *vmi)
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
seqlock-add-raw_seqcount_try_begin.patch
mm-convert-mm_lock_seq-to-a-proper-seqcount.patch
mm-introduce-mmap_lock_speculate_try_beginretry.patch
mm-introduce-vma_start_read_locked_nested-helpers.patch
mm-move-per-vma-lock-into-vm_area_struct.patch
mm-mark-vma-as-detached-until-its-added-into-vma-tree.patch
mm-modify-vma_iter_store_gfp-to-indicate-if-its-storing-a-new-vma.patch
mm-mark-vmas-detached-upon-exit.patch
mm-nommu-fix-the-last-places-where-vma-is-not-locked-before-being-attached.patch
types-move-struct-rcuwait-into-typesh.patch
mm-allow-vma_start_read_locked-vma_start_read_locked_nested-to-fail.patch
mm-move-mmap_init_lock-out-of-the-header-file.patch
mm-uninline-the-main-body-of-vma_start_write.patch
refcount-introduce-__refcount_addinc_not_zero_limited.patch
mm-replace-vm_lock-and-detached-flag-with-a-reference-count.patch
mm-debug-print-vm_refcnt-state-when-dumping-the-vma.patch
mm-debug-print-vm_refcnt-state-when-dumping-the-vma-fix.patch
mm-remove-extra-vma_numab_state_init-call.patch
mm-prepare-lock_vma_under_rcu-for-vma-reuse-possibility.patch
mm-make-vma-cache-slab_typesafe_by_rcu.patch
docs-mm-document-latest-changes-to-vm_lock.patch
