From: Suren Baghdasaryan <surenb@google.com>
To: akpm@linux-foundation.org
Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com,
vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net,
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leewalsh@google.com, posk@google.com, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org,
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surenb@google.com
Subject: [PATCH 38/41] mm: avoid assertion in untrack_pfn
Date: Mon, 9 Jan 2023 12:53:33 -0800 [thread overview]
Message-ID: <20230109205336.3665937-39-surenb@google.com> (raw)
In-Reply-To: <20230109205336.3665937-1-surenb@google.com>
untrack_pfn can be called after VMA was isolated and mmap_lock downgraded.
An attempt to lock affected VMA would cause an assertion, therefore
use mod_vm_flags_nolock in such situations.
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
arch/x86/mm/pat/memtype.c | 10 +++++++---
include/linux/mm.h | 2 +-
include/linux/pgtable.h | 5 +++--
mm/memory.c | 15 ++++++++-------
mm/memremap.c | 4 ++--
mm/mmap.c | 4 ++--
6 files changed, 23 insertions(+), 17 deletions(-)
diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index 9e490a372896..f71c8381430b 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -1045,7 +1045,7 @@ void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, pfn_t pfn)
* can be for the entire vma (in which case pfn, size are zero).
*/
void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
- unsigned long size)
+ unsigned long size, bool lock_vma)
{
resource_size_t paddr;
unsigned long prot;
@@ -1064,8 +1064,12 @@ void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
size = vma->vm_end - vma->vm_start;
}
free_pfn_range(paddr, size);
- if (vma)
- clear_vm_flags(vma, VM_PAT);
+ if (vma) {
+ if (lock_vma)
+ clear_vm_flags(vma, VM_PAT);
+ else
+ mod_vm_flags_nolock(vma, 0, VM_PAT);
+ }
}
/*
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7d436a5027cc..3158f33e268c 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2135,7 +2135,7 @@ void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
unsigned long size, struct zap_details *details);
void unmap_vmas(struct mmu_gather *tlb, struct maple_tree *mt,
struct vm_area_struct *start_vma, unsigned long start,
- unsigned long end);
+ unsigned long end, bool lock_vma);
struct mmu_notifier_range;
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 1159b25b0542..eaa831bd675d 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1214,7 +1214,8 @@ static inline int track_pfn_copy(struct vm_area_struct *vma)
* can be for the entire vma (in which case pfn, size are zero).
*/
static inline void untrack_pfn(struct vm_area_struct *vma,
- unsigned long pfn, unsigned long size)
+ unsigned long pfn, unsigned long size,
+ bool lock_vma)
{
}
@@ -1232,7 +1233,7 @@ extern void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
pfn_t pfn);
extern int track_pfn_copy(struct vm_area_struct *vma);
extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
- unsigned long size);
+ unsigned long size, bool lock_vma);
extern void untrack_pfn_moved(struct vm_area_struct *vma);
#endif
diff --git a/mm/memory.c b/mm/memory.c
index 12508f4d845a..5c7d5eaa60d8 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1610,7 +1610,7 @@ void unmap_page_range(struct mmu_gather *tlb,
static void unmap_single_vma(struct mmu_gather *tlb,
struct vm_area_struct *vma, unsigned long start_addr,
unsigned long end_addr,
- struct zap_details *details)
+ struct zap_details *details, bool lock_vma)
{
unsigned long start = max(vma->vm_start, start_addr);
unsigned long end;
@@ -1625,7 +1625,7 @@ static void unmap_single_vma(struct mmu_gather *tlb,
uprobe_munmap(vma, start, end);
if (unlikely(vma->vm_flags & VM_PFNMAP))
- untrack_pfn(vma, 0, 0);
+ untrack_pfn(vma, 0, 0, lock_vma);
if (start != end) {
if (unlikely(is_vm_hugetlb_page(vma))) {
@@ -1672,7 +1672,7 @@ static void unmap_single_vma(struct mmu_gather *tlb,
*/
void unmap_vmas(struct mmu_gather *tlb, struct maple_tree *mt,
struct vm_area_struct *vma, unsigned long start_addr,
- unsigned long end_addr)
+ unsigned long end_addr, bool lock_vma)
{
struct mmu_notifier_range range;
struct zap_details details = {
@@ -1686,7 +1686,8 @@ void unmap_vmas(struct mmu_gather *tlb, struct maple_tree *mt,
start_addr, end_addr);
mmu_notifier_invalidate_range_start(&range);
do {
- unmap_single_vma(tlb, vma, start_addr, end_addr, &details);
+ unmap_single_vma(tlb, vma, start_addr, end_addr, &details,
+ lock_vma);
} while ((vma = mas_find(&mas, end_addr - 1)) != NULL);
mmu_notifier_invalidate_range_end(&range);
}
@@ -1715,7 +1716,7 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
update_hiwater_rss(vma->vm_mm);
mmu_notifier_invalidate_range_start(&range);
do {
- unmap_single_vma(&tlb, vma, start, range.end, NULL);
+ unmap_single_vma(&tlb, vma, start, range.end, NULL, false);
} while ((vma = mas_find(&mas, end - 1)) != NULL);
mmu_notifier_invalidate_range_end(&range);
tlb_finish_mmu(&tlb);
@@ -1750,7 +1751,7 @@ void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
* unmap 'address-end' not 'range.start-range.end' as range
* could have been expanded for hugetlb pmd sharing.
*/
- unmap_single_vma(&tlb, vma, address, end, details);
+ unmap_single_vma(&tlb, vma, address, end, details, false);
mmu_notifier_invalidate_range_end(&range);
tlb_finish_mmu(&tlb);
}
@@ -2519,7 +2520,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
err = remap_pfn_range_notrack(vma, addr, pfn, size, prot);
if (err)
- untrack_pfn(vma, pfn, PAGE_ALIGN(size));
+ untrack_pfn(vma, pfn, PAGE_ALIGN(size), true);
return err;
}
EXPORT_SYMBOL(remap_pfn_range);
diff --git a/mm/memremap.c b/mm/memremap.c
index 08cbf54fe037..2f88f43d4a01 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -129,7 +129,7 @@ static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)
}
mem_hotplug_done();
- untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range));
+ untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range), true);
pgmap_array_delete(range);
}
@@ -276,7 +276,7 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
if (!is_private)
kasan_remove_zero_shadow(__va(range->start), range_len(range));
err_kasan:
- untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range));
+ untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range), true);
err_pfn_remap:
pgmap_array_delete(range);
return error;
diff --git a/mm/mmap.c b/mm/mmap.c
index a256deca0bc0..332af383f7cd 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2209,7 +2209,7 @@ static void unmap_region(struct mm_struct *mm, struct maple_tree *mt,
lru_add_drain();
tlb_gather_mmu(&tlb, mm);
update_hiwater_rss(mm);
- unmap_vmas(&tlb, mt, vma, start, end);
+ unmap_vmas(&tlb, mt, vma, start, end, lock_vma);
free_pgtables(&tlb, mt, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS,
next ? next->vm_start : USER_PGTABLES_CEILING,
lock_vma);
@@ -3127,7 +3127,7 @@ void exit_mmap(struct mm_struct *mm)
tlb_gather_mmu_fullmm(&tlb, mm);
/* update_hiwater_rss(mm) here? but nobody should be looking */
/* Use ULONG_MAX here to ensure all VMAs in the mm are unmapped */
- unmap_vmas(&tlb, &mm->mm_mt, vma, 0, ULONG_MAX);
+ unmap_vmas(&tlb, &mm->mm_mt, vma, 0, ULONG_MAX, false);
mmap_read_unlock(mm);
/*
--
2.39.0
next prev parent reply other threads:[~2023-01-09 20:59 UTC|newest]
Thread overview: 186+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-09 20:52 [PATCH 00/41] Per-VMA locks Suren Baghdasaryan
2023-01-09 20:52 ` [PATCH 01/41] maple_tree: Be more cautious about dead nodes Suren Baghdasaryan
2023-01-09 20:52 ` [PATCH 02/41] maple_tree: Detect dead nodes in mas_start() Suren Baghdasaryan
2023-01-09 20:52 ` [PATCH 03/41] maple_tree: Fix freeing of nodes in rcu mode Suren Baghdasaryan
2023-01-09 20:52 ` [PATCH 04/41] maple_tree: remove extra smp_wmb() from mas_dead_leaves() Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 05/41] maple_tree: Fix write memory barrier of nodes once dead for RCU mode Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 06/41] maple_tree: Add smp_rmb() to dead node detection Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 07/41] mm: Enable maple tree RCU mode by default Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK Suren Baghdasaryan
2023-01-11 0:13 ` Davidlohr Bueso
2023-01-11 0:44 ` Suren Baghdasaryan
2023-01-11 8:23 ` Michal Hocko
2023-01-11 9:54 ` Ingo Molnar
[not found] ` <6be809f5554a4faaa22c287ba4224bd0@AcuMS.aculab.com>
2023-01-11 16:28 ` Suren Baghdasaryan
2023-01-11 16:44 ` Michal Hocko
2023-01-11 17:04 ` Suren Baghdasaryan
2023-01-11 17:37 ` Michal Hocko
2023-01-11 17:49 ` Suren Baghdasaryan
2023-01-11 18:02 ` Michal Hocko
2023-01-11 18:09 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 09/41] mm: rcu safe VMA freeing Suren Baghdasaryan
2023-01-17 14:25 ` Michal Hocko
2023-01-18 2:16 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 10/41] mm: move mmap_lock assert function definitions Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 11/41] mm: export dump_mm() Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 12/41] mm: add per-VMA lock and helper functions to control it Suren Baghdasaryan
2023-01-17 15:04 ` Michal Hocko
2023-01-17 15:12 ` Michal Hocko
2023-01-17 21:21 ` Suren Baghdasaryan
2023-01-17 21:54 ` Matthew Wilcox
2023-01-17 22:33 ` Suren Baghdasaryan
2023-01-18 9:18 ` Michal Hocko
2023-01-17 21:08 ` Suren Baghdasaryan
2023-01-17 15:07 ` Michal Hocko
2023-01-17 21:09 ` Suren Baghdasaryan
2023-01-17 18:02 ` Jann Horn
2023-01-17 21:28 ` Suren Baghdasaryan
2023-01-17 21:45 ` Jann Horn
2023-01-17 22:36 ` Suren Baghdasaryan
2023-01-17 23:15 ` Matthew Wilcox
2023-11-22 14:04 ` Alexander Gordeev
2023-01-18 12:28 ` Michal Hocko
2023-01-18 13:23 ` Jann Horn
2023-01-18 15:11 ` Michal Hocko
2023-01-18 17:36 ` Suren Baghdasaryan
2023-01-18 21:28 ` Michal Hocko
2023-01-18 21:45 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 13/41] mm: introduce vma->vm_flags modifier functions Suren Baghdasaryan
2023-01-11 15:47 ` Davidlohr Bueso
2023-01-11 17:36 ` Suren Baghdasaryan
2023-01-11 19:52 ` Davidlohr Bueso
2023-01-11 21:23 ` Suren Baghdasaryan
2023-01-17 15:09 ` Michal Hocko
2023-01-17 15:15 ` Michal Hocko
2023-01-18 2:07 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 14/41] mm: replace VM_LOCKED_CLEAR_MASK with VM_LOCKED_MASK Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 15/41] mm: replace vma->vm_flags direct modifications with modifier calls Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 16/41] mm: replace vma->vm_flags indirect modification in ksm_madvise Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 17/41] mm/mmap: move VMA locking before anon_vma_lock_write call Suren Baghdasaryan
2023-01-17 15:16 ` Michal Hocko
2023-01-18 2:01 ` Suren Baghdasaryan
2023-01-18 9:23 ` Michal Hocko
2023-01-18 18:09 ` Suren Baghdasaryan
2023-01-18 21:33 ` Michal Hocko
2023-01-18 21:48 ` Suren Baghdasaryan
2023-01-19 9:31 ` Michal Hocko
2023-01-19 18:53 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 18/41] mm/khugepaged: write-lock VMA while collapsing a huge page Suren Baghdasaryan
2023-01-17 15:25 ` Michal Hocko
2023-01-17 20:28 ` Jann Horn
2023-01-17 21:05 ` Suren Baghdasaryan
2023-01-18 9:40 ` Michal Hocko
2023-01-18 12:38 ` Jann Horn
2023-01-18 17:41 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 19/41] mm/mmap: write-lock VMAs before merging, splitting or expanding them Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 20/41] mm/mmap: write-lock VMAs in vma_adjust Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 21/41] mm/mmap: write-lock VMAs affected by VMA expansion Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 22/41] mm/mremap: write-lock VMA while remapping it to a new address range Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 23/41] mm: write-lock VMAs before removing them from VMA tree Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 24/41] mm: conditionally write-lock VMA in free_pgtables Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 25/41] mm/mmap: write-lock adjacent VMAs if they can grow into unmapped area Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 26/41] kernel/fork: assert no VMA readers during its destruction Suren Baghdasaryan
2023-01-17 15:42 ` Michal Hocko
2023-01-18 1:53 ` Suren Baghdasaryan
2023-01-18 9:43 ` Michal Hocko
2023-01-18 18:06 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 27/41] mm/mmap: prevent pagefault handler from racing with mmu_notifier registration Suren Baghdasaryan
2023-01-18 12:50 ` Jann Horn
2023-01-18 17:40 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 28/41] mm: introduce lock_vma_under_rcu to be used from arch-specific code Suren Baghdasaryan
2023-01-17 15:47 ` Michal Hocko
2023-01-18 1:06 ` Suren Baghdasaryan
2023-01-18 2:44 ` Matthew Wilcox
2023-01-18 21:33 ` Suren Baghdasaryan
2023-01-17 21:03 ` Jann Horn
2023-01-17 23:18 ` Liam Howlett
2023-01-09 20:53 ` [PATCH 29/41] mm: fall back to mmap_lock if vma->anon_vma is not yet set Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 30/41] mm: add FAULT_FLAG_VMA_LOCK flag Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 31/41] mm: prevent do_swap_page from handling page faults under VMA lock Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 32/41] mm: prevent userfaults to be handled under per-vma lock Suren Baghdasaryan
2023-01-17 19:51 ` Jann Horn
2023-01-17 20:36 ` Jann Horn
2023-01-17 20:57 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 33/41] mm: introduce per-VMA lock statistics Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 34/41] x86/mm: try VMA lock-based page fault handling first Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 35/41] arm64/mm: " Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 36/41] powerc/mm: " Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 37/41] mm: introduce mod_vm_flags_nolock Suren Baghdasaryan
2023-01-09 20:53 ` Suren Baghdasaryan [this message]
2023-01-09 20:53 ` [PATCH 39/41] kernel/fork: throttle call_rcu() calls in vm_area_free Suren Baghdasaryan
2023-01-17 15:57 ` Michal Hocko
2023-01-18 1:19 ` Suren Baghdasaryan
2023-01-18 9:49 ` Michal Hocko
2023-01-18 18:04 ` Suren Baghdasaryan
2023-01-18 18:34 ` Paul E. McKenney
2023-01-18 19:01 ` Suren Baghdasaryan
2023-01-18 20:20 ` Paul E. McKenney
2023-01-19 12:52 ` Michal Hocko
2023-01-19 19:17 ` Paul E. McKenney
2023-01-20 8:57 ` Michal Hocko
2023-01-20 16:08 ` Paul E. McKenney
2023-01-19 12:59 ` Michal Hocko
2023-01-19 18:52 ` Suren Baghdasaryan
2023-01-19 19:20 ` Paul E. McKenney
2023-01-19 19:47 ` Suren Baghdasaryan
2023-01-19 19:55 ` Paul E. McKenney
2023-01-20 8:52 ` Michal Hocko
2023-01-20 16:20 ` Suren Baghdasaryan
2023-01-20 16:45 ` Suren Baghdasaryan
2023-01-20 16:49 ` Matthew Wilcox
2023-01-20 17:08 ` Liam R. Howlett
2023-01-20 17:17 ` Suren Baghdasaryan
2023-01-20 17:32 ` Matthew Wilcox
2023-01-20 17:50 ` Suren Baghdasaryan
2023-01-20 19:23 ` Liam R. Howlett
2023-01-23 9:56 ` Michal Hocko
2023-01-23 16:22 ` Suren Baghdasaryan
2023-01-23 16:55 ` Michal Hocko
2023-01-23 17:07 ` Suren Baghdasaryan
2023-01-23 17:16 ` Michal Hocko
2023-01-23 17:46 ` Suren Baghdasaryan
2023-01-23 18:23 ` Matthew Wilcox
2023-01-23 18:47 ` Suren Baghdasaryan
2023-01-23 19:18 ` Michal Hocko
2023-01-23 19:30 ` Matthew Wilcox
2023-01-23 19:57 ` Suren Baghdasaryan
2023-01-23 20:00 ` Michal Hocko
2023-01-23 20:08 ` Suren Baghdasaryan
2023-01-23 20:38 ` Liam R. Howlett
2023-01-20 17:21 ` Paul E. McKenney
2023-01-20 18:42 ` Suren Baghdasaryan
2023-01-23 9:59 ` Michal Hocko
2023-01-23 17:43 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 40/41] mm: separate vma->lock from vm_area_struct Suren Baghdasaryan
2023-01-17 18:33 ` Jann Horn
2023-01-17 19:01 ` Suren Baghdasaryan
2023-01-09 20:53 ` [PATCH 41/41] mm: replace rw_semaphore with atomic_t in vma_lock Suren Baghdasaryan
2023-01-10 8:04 ` Vlastimil Babka
2023-01-10 17:05 ` Suren Baghdasaryan
2023-01-16 11:14 ` Hyeonggon Yoo
2023-01-16 22:36 ` Suren Baghdasaryan
2023-01-17 4:14 ` Matthew Wilcox
2023-01-17 4:34 ` Suren Baghdasaryan
2023-01-17 5:46 ` Matthew Wilcox
2023-01-17 5:58 ` Suren Baghdasaryan
2023-01-17 18:23 ` Matthew Wilcox
2023-01-17 18:28 ` Suren Baghdasaryan
2023-01-17 20:31 ` Michal Hocko
2023-01-17 21:00 ` Suren Baghdasaryan
[not found] ` <20230116140649.2012-1-hdanton@sina.com>
2023-01-16 23:08 ` Suren Baghdasaryan
2023-01-16 23:11 ` Suren Baghdasaryan
[not found] ` <20230117031632.2321-1-hdanton@sina.com>
2023-01-17 4:52 ` Suren Baghdasaryan
[not found] ` <20230117083355.2374-1-hdanton@sina.com>
2023-01-17 18:21 ` Suren Baghdasaryan
2023-01-17 18:27 ` Matthew Wilcox
2023-01-17 18:31 ` Suren Baghdasaryan
[not found] ` <20230118062639.2839-1-hdanton@sina.com>
2023-01-18 18:35 ` Matthew Wilcox
2023-01-17 18:11 ` Jann Horn
2023-01-17 18:26 ` Suren Baghdasaryan
2023-01-17 18:31 ` Matthew Wilcox
2023-01-17 18:36 ` Jann Horn
2023-01-17 18:49 ` Suren Baghdasaryan
2023-01-17 18:36 ` Suren Baghdasaryan
2023-01-17 18:48 ` Matthew Wilcox
2023-01-17 18:55 ` Suren Baghdasaryan
2023-01-17 18:59 ` Jann Horn
2023-01-17 19:06 ` Suren Baghdasaryan
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