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-rw-r--r--mm/backing-dev.c23
-rw-r--r--mm/compaction.c24
-rw-r--r--mm/filemap.c8
-rw-r--r--mm/filemap_xip.c7
-rw-r--r--mm/huge_memory.c10
-rw-r--r--mm/hugetlb.c2
-rw-r--r--mm/kmemleak.c3
-rw-r--r--mm/ksm.c11
-rw-r--r--mm/memblock.c13
-rw-r--r--mm/memcontrol.c110
-rw-r--r--mm/mempolicy.c3
-rw-r--r--mm/migrate.c4
-rw-r--r--mm/mlock.c3
-rw-r--r--mm/mmap.c17
-rw-r--r--mm/mprotect.c3
-rw-r--r--mm/nommu.c9
-rw-r--r--mm/page_alloc.c1
-rw-r--r--mm/page_cgroup.c4
-rw-r--r--mm/percpu-vm.c3
-rw-r--r--mm/process_vm_access.c23
-rw-r--r--mm/swap.c10
-rw-r--r--mm/swap_state.c10
22 files changed, 171 insertions, 130 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 7ba8feae11b8..dd8e2aafb07e 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -318,7 +318,7 @@ static void wakeup_timer_fn(unsigned long data)
if (bdi->wb.task) {
trace_writeback_wake_thread(bdi);
wake_up_process(bdi->wb.task);
- } else {
+ } else if (bdi->dev) {
/*
* When bdi tasks are inactive for long time, they are killed.
* In this case we have to wake-up the forker thread which
@@ -584,6 +584,8 @@ EXPORT_SYMBOL(bdi_register_dev);
*/
static void bdi_wb_shutdown(struct backing_dev_info *bdi)
{
+ struct task_struct *task;
+
if (!bdi_cap_writeback_dirty(bdi))
return;
@@ -602,8 +604,13 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
* Finally, kill the kernel thread. We don't need to be RCU
* safe anymore, since the bdi is gone from visibility.
*/
- if (bdi->wb.task)
- kthread_stop(bdi->wb.task);
+ spin_lock_bh(&bdi->wb_lock);
+ task = bdi->wb.task;
+ bdi->wb.task = NULL;
+ spin_unlock_bh(&bdi->wb_lock);
+
+ if (task)
+ kthread_stop(task);
}
/*
@@ -623,7 +630,9 @@ static void bdi_prune_sb(struct backing_dev_info *bdi)
void bdi_unregister(struct backing_dev_info *bdi)
{
- if (bdi->dev) {
+ struct device *dev = bdi->dev;
+
+ if (dev) {
bdi_set_min_ratio(bdi, 0);
trace_writeback_bdi_unregister(bdi);
bdi_prune_sb(bdi);
@@ -632,8 +641,12 @@ void bdi_unregister(struct backing_dev_info *bdi)
if (!bdi_cap_flush_forker(bdi))
bdi_wb_shutdown(bdi);
bdi_debug_unregister(bdi);
- device_unregister(bdi->dev);
+
+ spin_lock_bh(&bdi->wb_lock);
bdi->dev = NULL;
+ spin_unlock_bh(&bdi->wb_lock);
+
+ device_unregister(dev);
}
}
EXPORT_SYMBOL(bdi_unregister);
diff --git a/mm/compaction.c b/mm/compaction.c
index 71a58f67f481..d9ebebe1a2aa 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -313,12 +313,34 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
} else if (!locked)
spin_lock_irq(&zone->lru_lock);
+ /*
+ * migrate_pfn does not necessarily start aligned to a
+ * pageblock. Ensure that pfn_valid is called when moving
+ * into a new MAX_ORDER_NR_PAGES range in case of large
+ * memory holes within the zone
+ */
+ if ((low_pfn & (MAX_ORDER_NR_PAGES - 1)) == 0) {
+ if (!pfn_valid(low_pfn)) {
+ low_pfn += MAX_ORDER_NR_PAGES - 1;
+ continue;
+ }
+ }
+
if (!pfn_valid_within(low_pfn))
continue;
nr_scanned++;
- /* Get the page and skip if free */
+ /*
+ * Get the page and ensure the page is within the same zone.
+ * See the comment in isolate_freepages about overlapping
+ * nodes. It is deliberate that the new zone lock is not taken
+ * as memory compaction should not move pages between nodes.
+ */
page = pfn_to_page(low_pfn);
+ if (page_zone(page) != zone)
+ continue;
+
+ /* Skip if free */
if (PageBuddy(page))
continue;
diff --git a/mm/filemap.c b/mm/filemap.c
index 97f49ed35bd2..b66275757c28 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1400,15 +1400,12 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long seg = 0;
size_t count;
loff_t *ppos = &iocb->ki_pos;
- struct blk_plug plug;
count = 0;
retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
if (retval)
return retval;
- blk_start_plug(&plug);
-
/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
if (filp->f_flags & O_DIRECT) {
loff_t size;
@@ -1424,8 +1421,12 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
retval = filemap_write_and_wait_range(mapping, pos,
pos + iov_length(iov, nr_segs) - 1);
if (!retval) {
+ struct blk_plug plug;
+
+ blk_start_plug(&plug);
retval = mapping->a_ops->direct_IO(READ, iocb,
iov, pos, nr_segs);
+ blk_finish_plug(&plug);
}
if (retval > 0) {
*ppos = pos + retval;
@@ -1481,7 +1482,6 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
break;
}
out:
- blk_finish_plug(&plug);
return retval;
}
EXPORT_SYMBOL(generic_file_aio_read);
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index f91b2f687343..a4eb31132229 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -263,7 +263,12 @@ found:
xip_pfn);
if (err == -ENOMEM)
return VM_FAULT_OOM;
- BUG_ON(err);
+ /*
+ * err == -EBUSY is fine, we've raced against another thread
+ * that faulted-in the same page
+ */
+ if (err != -EBUSY)
+ BUG_ON(err);
return VM_FAULT_NOPAGE;
} else {
int err, ret = VM_FAULT_OOM;
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b3ffc21ce801..8f7fc394f636 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -671,6 +671,7 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
set_pmd_at(mm, haddr, pmd, entry);
prepare_pmd_huge_pte(pgtable, mm);
add_mm_counter(mm, MM_ANONPAGES, HPAGE_PMD_NR);
+ mm->nr_ptes++;
spin_unlock(&mm->page_table_lock);
}
@@ -789,6 +790,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pmd = pmd_mkold(pmd_wrprotect(pmd));
set_pmd_at(dst_mm, addr, dst_pmd, pmd);
prepare_pmd_huge_pte(pgtable, dst_mm);
+ dst_mm->nr_ptes++;
ret = 0;
out_unlock:
@@ -887,7 +889,6 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
}
kfree(pages);
- mm->nr_ptes++;
smp_wmb(); /* make pte visible before pmd */
pmd_populate(mm, pmd, pgtable);
page_remove_rmap(page);
@@ -1047,6 +1048,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
VM_BUG_ON(page_mapcount(page) < 0);
add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
VM_BUG_ON(!PageHead(page));
+ tlb->mm->nr_ptes--;
spin_unlock(&tlb->mm->page_table_lock);
tlb_remove_page(tlb, page);
pte_free(tlb->mm, pgtable);
@@ -1375,7 +1377,6 @@ static int __split_huge_page_map(struct page *page,
pte_unmap(pte);
}
- mm->nr_ptes++;
smp_wmb(); /* make pte visible before pmd */
/*
* Up to this point the pmd is present and huge and
@@ -1988,7 +1989,6 @@ static void collapse_huge_page(struct mm_struct *mm,
set_pmd_at(mm, address, pmd, _pmd);
update_mmu_cache(vma, address, _pmd);
prepare_pmd_huge_pte(pgtable, mm);
- mm->nr_ptes--;
spin_unlock(&mm->page_table_lock);
#ifndef CONFIG_NUMA
@@ -2083,7 +2083,7 @@ static void collect_mm_slot(struct mm_slot *mm_slot)
{
struct mm_struct *mm = mm_slot->mm;
- VM_BUG_ON(!spin_is_locked(&khugepaged_mm_lock));
+ VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&khugepaged_mm_lock));
if (khugepaged_test_exit(mm)) {
/* free mm_slot */
@@ -2113,7 +2113,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
int progress = 0;
VM_BUG_ON(!pages);
- VM_BUG_ON(!spin_is_locked(&khugepaged_mm_lock));
+ VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&khugepaged_mm_lock));
if (khugepaged_scan.mm_slot)
mm_slot = khugepaged_scan.mm_slot;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 5f34bd8dda34..a876871f6be5 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2277,8 +2277,8 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
set_page_dirty(page);
list_add(&page->lru, &page_list);
}
- spin_unlock(&mm->page_table_lock);
flush_tlb_range(vma, start, end);
+ spin_unlock(&mm->page_table_lock);
mmu_notifier_invalidate_range_end(mm, start, end);
list_for_each_entry_safe(page, tmp, &page_list, lru) {
page_remove_rmap(page);
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index c833addd94d7..45eb6217bf38 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -1036,7 +1036,7 @@ void __ref kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp)
{
pr_debug("%s(0x%p)\n", __func__, ptr);
- if (atomic_read(&kmemleak_enabled) && ptr && !IS_ERR(ptr))
+ if (atomic_read(&kmemleak_enabled) && ptr && size && !IS_ERR(ptr))
add_scan_area((unsigned long)ptr, size, gfp);
else if (atomic_read(&kmemleak_early_log))
log_early(KMEMLEAK_SCAN_AREA, ptr, size, 0);
@@ -1757,6 +1757,7 @@ void __init kmemleak_init(void)
#ifdef CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF
if (!kmemleak_skip_disable) {
+ atomic_set(&kmemleak_early_log, 0);
kmemleak_disable();
return;
}
diff --git a/mm/ksm.c b/mm/ksm.c
index 1925ffbfb27f..310544a379ae 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -28,7 +28,6 @@
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/slab.h>
-#include <linux/memcontrol.h>
#include <linux/rbtree.h>
#include <linux/memory.h>
#include <linux/mmu_notifier.h>
@@ -1572,16 +1571,6 @@ struct page *ksm_does_need_to_copy(struct page *page,
new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
if (new_page) {
- /*
- * The memcg-specific accounting when moving
- * pages around the LRU lists relies on the
- * page's owner (memcg) to be valid. Usually,
- * pages are assigned to a new owner before
- * being put on the LRU list, but since this
- * is not the case here, the stale owner from
- * a previous allocation cycle must be reset.
- */
- mem_cgroup_reset_owner(new_page);
copy_user_highpage(new_page, page, address, vma);
SetPageDirty(new_page);
diff --git a/mm/memblock.c b/mm/memblock.c
index 2f55f19b7c86..99f285599501 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -99,21 +99,21 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
phys_addr_t this_start, this_end, cand;
u64 i;
- /* align @size to avoid excessive fragmentation on reserved array */
- size = round_up(size, align);
-
/* pump up @end */
if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
end = memblock.current_limit;
- /* adjust @start to avoid underflow and allocating the first page */
- start = max3(start, size, (phys_addr_t)PAGE_SIZE);
+ /* avoid allocating the first page */
+ start = max_t(phys_addr_t, start, PAGE_SIZE);
end = max(start, end);
for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
this_start = clamp(this_start, start, end);
this_end = clamp(this_end, start, end);
+ if (this_end < size)
+ continue;
+
cand = round_down(this_end - size, align);
if (cand >= this_start)
return cand;
@@ -728,6 +728,9 @@ static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
{
phys_addr_t found;
+ /* align @size to avoid excessive fragmentation on reserved array */
+ size = round_up(size, align);
+
found = memblock_find_in_range_node(0, max_addr, size, align, nid);
if (found && !memblock_reserve(found, size))
return found;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 556859fec4ef..d0e57a3cda18 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -776,7 +776,8 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
/* threshold event is triggered in finer grain than soft limit */
if (unlikely(mem_cgroup_event_ratelimit(memcg,
MEM_CGROUP_TARGET_THRESH))) {
- bool do_softlimit, do_numainfo;
+ bool do_softlimit;
+ bool do_numainfo __maybe_unused;
do_softlimit = mem_cgroup_event_ratelimit(memcg,
MEM_CGROUP_TARGET_SOFTLIMIT);
@@ -1041,6 +1042,19 @@ struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, struct page *page,
pc = lookup_page_cgroup(page);
memcg = pc->mem_cgroup;
+
+ /*
+ * Surreptitiously switch any uncharged page to root:
+ * an uncharged page off lru does nothing to secure
+ * its former mem_cgroup from sudden removal.
+ *
+ * Our caller holds lru_lock, and PageCgroupUsed is updated
+ * under page_cgroup lock: between them, they make all uses
+ * of pc->mem_cgroup safe.
+ */
+ if (!PageCgroupUsed(pc) && memcg != root_mem_cgroup)
+ pc->mem_cgroup = memcg = root_mem_cgroup;
+
mz = page_cgroup_zoneinfo(memcg, page);
/* compound_order() is stabilized through lru_lock */
MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page);
@@ -2407,8 +2421,12 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
struct page *page,
unsigned int nr_pages,
struct page_cgroup *pc,
- enum charge_type ctype)
+ enum charge_type ctype,
+ bool lrucare)
{
+ struct zone *uninitialized_var(zone);
+ bool was_on_lru = false;
+
lock_page_cgroup(pc);
if (unlikely(PageCgroupUsed(pc))) {
unlock_page_cgroup(pc);
@@ -2419,6 +2437,21 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
* we don't need page_cgroup_lock about tail pages, becase they are not
* accessed by any other context at this point.
*/
+
+ /*
+ * In some cases, SwapCache and FUSE(splice_buf->radixtree), the page
+ * may already be on some other mem_cgroup's LRU. Take care of it.
+ */
+ if (lrucare) {
+ zone = page_zone(page);
+ spin_lock_irq(&zone->lru_lock);
+ if (PageLRU(page)) {
+ ClearPageLRU(page);
+ del_page_from_lru_list(zone, page, page_lru(page));
+ was_on_lru = true;
+ }
+ }
+
pc->mem_cgroup = memcg;
/*
* We access a page_cgroup asynchronously without lock_page_cgroup().
@@ -2442,9 +2475,18 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
break;
}
+ if (lrucare) {
+ if (was_on_lru) {
+ VM_BUG_ON(PageLRU(page));
+ SetPageLRU(page);
+ add_page_to_lru_list(zone, page, page_lru(page));
+ }
+ spin_unlock_irq(&zone->lru_lock);
+ }
+
mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), nr_pages);
unlock_page_cgroup(pc);
- WARN_ON_ONCE(PageLRU(page));
+
/*
* "charge_statistics" updated event counter. Then, check it.
* Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.
@@ -2642,7 +2684,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
ret = __mem_cgroup_try_charge(mm, gfp_mask, nr_pages, &memcg, oom);
if (ret == -ENOMEM)
return ret;
- __mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype);
+ __mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype, false);
return 0;
}
@@ -2662,35 +2704,6 @@ static void
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
enum charge_type ctype);
-static void
-__mem_cgroup_commit_charge_lrucare(struct page *page, struct mem_cgroup *memcg,
- enum charge_type ctype)
-{
- struct page_cgroup *pc = lookup_page_cgroup(page);
- struct zone *zone = page_zone(page);
- unsigned long flags;
- bool removed = false;
-
- /*
- * In some case, SwapCache, FUSE(splice_buf->radixtree), the page
- * is already on LRU. It means the page may on some other page_cgroup's
- * LRU. Take care of it.
- */
- spin_lock_irqsave(&zone->lru_lock, flags);
- if (PageLRU(page)) {
- del_page_from_lru_list(zone, page, page_lru(page));
- ClearPageLRU(page);
- removed = true;
- }
- __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype);
- if (removed) {
- add_page_to_lru_list(zone, page, page_lru(page));
- SetPageLRU(page);
- }
- spin_unlock_irqrestore(&zone->lru_lock, flags);
- return;
-}
-
int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
@@ -2768,13 +2781,16 @@ static void
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
enum charge_type ctype)
{
+ struct page_cgroup *pc;
+
if (mem_cgroup_disabled())
return;
if (!memcg)
return;
cgroup_exclude_rmdir(&memcg->css);
- __mem_cgroup_commit_charge_lrucare(page, memcg, ctype);
+ pc = lookup_page_cgroup(page);
+ __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype, true);
/*
* Now swap is on-memory. This means this page may be
* counted both as mem and swap....double count.
@@ -3026,23 +3042,6 @@ void mem_cgroup_uncharge_end(void)
batch->memcg = NULL;
}
-/*
- * A function for resetting pc->mem_cgroup for newly allocated pages.
- * This function should be called if the newpage will be added to LRU
- * before start accounting.
- */
-void mem_cgroup_reset_owner(struct page *newpage)
-{
- struct page_cgroup *pc;
-
- if (mem_cgroup_disabled())
- return;
-
- pc = lookup_page_cgroup(newpage);
- VM_BUG_ON(PageCgroupUsed(pc));
- pc->mem_cgroup = root_mem_cgroup;
-}
-
#ifdef CONFIG_SWAP
/*
* called after __delete_from_swap_cache() and drop "page" account.
@@ -3247,7 +3246,7 @@ int mem_cgroup_prepare_migration(struct page *page,
ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
else
ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM;
- __mem_cgroup_commit_charge(memcg, newpage, 1, pc, ctype);
+ __mem_cgroup_commit_charge(memcg, newpage, 1, pc, ctype, false);
return ret;
}
@@ -3331,7 +3330,7 @@ void mem_cgroup_replace_page_cache(struct page *oldpage,
* the newpage may be on LRU(or pagevec for LRU) already. We lock
* LRU while we overwrite pc->mem_cgroup.
*/
- __mem_cgroup_commit_charge_lrucare(newpage, memcg, type);
+ __mem_cgroup_commit_charge(memcg, newpage, 1, pc, type, true);
}
#ifdef CONFIG_DEBUG_VM
@@ -4413,6 +4412,9 @@ static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp,
*/
BUG_ON(!thresholds);
+ if (!thresholds->primary)
+ goto unlock;
+
usage = mem_cgroup_usage(memcg, type == _MEMSWAP);
/* Check if a threshold crossed before removing */
@@ -4461,7 +4463,7 @@ swap_buffers:
/* To be sure that nobody uses thresholds */
synchronize_rcu();
-
+unlock:
mutex_unlock(&memcg->thresholds_lock);
}
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 06b145fb64ab..47296fee23db 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -640,10 +640,11 @@ static int mbind_range(struct mm_struct *mm, unsigned long start,
unsigned long vmstart;
unsigned long vmend;
- vma = find_vma_prev(mm, start, &prev);
+ vma = find_vma(mm, start);
if (!vma || vma->vm_start > start)
return -EFAULT;
+ prev = vma->vm_prev;
if (start > vma->vm_start)
prev = vma;
diff --git a/mm/migrate.c b/mm/migrate.c
index 9871a56d82c3..1503b6b54ecb 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -445,7 +445,6 @@ void migrate_page_copy(struct page *newpage, struct page *page)
ClearPageSwapCache(page);
ClearPagePrivate(page);
set_page_private(page, 0);
- page->mapping = NULL;
/*
* If any waiters have accumulated on the new page then
@@ -667,6 +666,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
} else {
if (remap_swapcache)
remove_migration_ptes(page, newpage);
+ page->mapping = NULL;
}
unlock_page(newpage);
@@ -839,8 +839,6 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
if (!newpage)
return -ENOMEM;
- mem_cgroup_reset_owner(newpage);
-
if (page_count(page) == 1) {
/* page was freed from under us. So we are done. */
goto out;
diff --git a/mm/mlock.c b/mm/mlock.c
index 4f4f53bdc65d..ef726e8aa8e9 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -385,10 +385,11 @@ static int do_mlock(unsigned long start, size_t len, int on)
return -EINVAL;
if (end == start)
return 0;
- vma = find_vma_prev(current->mm, start, &prev);
+ vma = find_vma(current->mm, start);
if (!vma || vma->vm_start > start)
return -ENOMEM;
+ prev = vma->vm_prev;
if (start > vma->vm_start)
prev = vma;
diff --git a/mm/mmap.c b/mm/mmap.c
index 3f758c7f4c81..da15a79b1441 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1266,8 +1266,9 @@ munmap_back:
vma->vm_pgoff = pgoff;
INIT_LIST_HEAD(&vma->anon_vma_chain);
+ error = -EINVAL; /* when rejecting VM_GROWSDOWN|VM_GROWSUP */
+
if (file) {
- error = -EINVAL;
if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
goto free_vma;
if (vm_flags & VM_DENYWRITE) {
@@ -1293,6 +1294,8 @@ munmap_back:
pgoff = vma->vm_pgoff;
vm_flags = vma->vm_flags;
} else if (vm_flags & VM_SHARED) {
+ if (unlikely(vm_flags & (VM_GROWSDOWN|VM_GROWSUP)))
+ goto free_vma;
error = shmem_zero_setup(vma);
if (error)
goto free_vma;
@@ -1605,7 +1608,6 @@ EXPORT_SYMBOL(find_vma);
/*
* Same as find_vma, but also return a pointer to the previous VMA in *pprev.
- * Note: pprev is set to NULL when return value is NULL.
*/
struct vm_area_struct *
find_vma_prev(struct mm_struct *mm, unsigned long addr,
@@ -1614,7 +1616,16 @@ find_vma_prev(struct mm_struct *mm, unsigned long addr,
struct vm_area_struct *vma;
vma = find_vma(mm, addr);
- *pprev = vma ? vma->vm_prev : NULL;
+ if (vma) {
+ *pprev = vma->vm_prev;
+ } else {
+ struct rb_node *rb_node = mm->mm_rb.rb_node;
+ *pprev = NULL;
+ while (rb_node) {
+ *pprev = rb_entry(rb_node, struct vm_area_struct, vm_rb);
+ rb_node = rb_node->rb_right;
+ }
+ }
return vma;
}
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 5a688a2756be..f437d054c3bf 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -262,10 +262,11 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
down_write(&current->mm->mmap_sem);
- vma = find_vma_prev(current->mm, start, &prev);
+ vma = find_vma(current->mm, start);
error = -ENOMEM;
if (!vma)
goto out;
+ prev = vma->vm_prev;
if (unlikely(grows & PROT_GROWSDOWN)) {
if (vma->vm_start >= end)
goto out;
diff --git a/mm/nommu.c b/mm/nommu.c
index b982290fd962..f59e170fceb4 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -696,9 +696,11 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
+ mutex_lock(&mapping->i_mmap_mutex);
flush_dcache_mmap_lock(mapping);
vma_prio_tree_insert(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
+ mutex_unlock(&mapping->i_mmap_mutex);
}
/* add the VMA to the tree */
@@ -760,9 +762,11 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
+ mutex_lock(&mapping->i_mmap_mutex);
flush_dcache_mmap_lock(mapping);
vma_prio_tree_remove(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
+ mutex_unlock(&mapping->i_mmap_mutex);
}
/* remove from the MM's tree and list */
@@ -775,8 +779,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
if (vma->vm_next)
vma->vm_next->vm_prev = vma->vm_prev;
-
- vma->vm_mm = NULL;
}
/*
@@ -2052,6 +2054,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
down_write(&nommu_region_sem);
+ mutex_lock(&inode->i_mapping->i_mmap_mutex);
/* search for VMAs that fall within the dead zone */
vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap,
@@ -2059,6 +2062,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
/* found one - only interested if it's shared out of the page
* cache */
if (vma->vm_flags & VM_SHARED) {
+ mutex_unlock(&inode->i_mapping->i_mmap_mutex);
up_write(&nommu_region_sem);
return -ETXTBSY; /* not quite true, but near enough */
}
@@ -2086,6 +2090,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
}
}
+ mutex_unlock(&inode->i_mapping->i_mmap_mutex);
up_write(&nommu_region_sem);
return 0;
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d2186ecb36f7..a13ded1938f0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5236,6 +5236,7 @@ void *__init alloc_large_system_hash(const char *tablename,
max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4;
do_div(max, bucketsize);
}
+ max = min(max, 0x80000000ULL);
if (numentries > max)
numentries = max;
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index de1616aa9b1e..1ccbd714059c 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -379,13 +379,15 @@ static struct swap_cgroup *lookup_swap_cgroup(swp_entry_t ent,
pgoff_t offset = swp_offset(ent);
struct swap_cgroup_ctrl *ctrl;
struct page *mappage;
+ struct swap_cgroup *sc;
ctrl = &swap_cgroup_ctrl[swp_type(ent)];
if (ctrlp)
*ctrlp = ctrl;
mappage = ctrl->map[offset / SC_PER_PAGE];
- return page_address(mappage) + offset % SC_PER_PAGE;
+ sc = page_address(mappage);
+ return sc + offset % SC_PER_PAGE;
}
/**
diff --git a/mm/percpu-vm.c b/mm/percpu-vm.c
index 12a48a88c0d8..405d331804c3 100644
--- a/mm/percpu-vm.c
+++ b/mm/percpu-vm.c
@@ -184,8 +184,7 @@ static void pcpu_unmap_pages(struct pcpu_chunk *chunk,
page_end - page_start);
}
- for (i = page_start; i < page_end; i++)
- __clear_bit(i, populated);
+ bitmap_clear(populated, page_start, page_end - page_start);
}
/**
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index e920aa3ce104..c20ff48994c2 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -298,23 +298,18 @@ static ssize_t process_vm_rw_core(pid_t pid, const struct iovec *lvec,
goto free_proc_pages;
}
- task_lock(task);
- if (__ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
- task_unlock(task);
- rc = -EPERM;
- goto put_task_struct;
- }
- mm = task->mm;
-
- if (!mm || (task->flags & PF_KTHREAD)) {
- task_unlock(task);
- rc = -EINVAL;
+ mm = mm_access(task, PTRACE_MODE_ATTACH);
+ if (!mm || IS_ERR(mm)) {
+ rc = IS_ERR(mm) ? PTR_ERR(mm) : -ESRCH;
+ /*
+ * Explicitly map EACCES to EPERM as EPERM is a more a
+ * appropriate error code for process_vw_readv/writev
+ */
+ if (rc == -EACCES)
+ rc = -EPERM;
goto put_task_struct;
}
- atomic_inc(&mm->mm_users);
- task_unlock(task);
-
for (i = 0; i < riovcnt && iov_l_curr_idx < liovcnt; i++) {
rc = process_vm_rw_single_vec(
(unsigned long)rvec[i].iov_base, rvec[i].iov_len,
diff --git a/mm/swap.c b/mm/swap.c
index b0f529b38979..14380e9fbe33 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -652,14 +652,14 @@ EXPORT_SYMBOL(__pagevec_release);
void lru_add_page_tail(struct zone* zone,
struct page *page, struct page *page_tail)
{
- int active;
+ int uninitialized_var(active);
enum lru_list lru;
const int file = 0;
VM_BUG_ON(!PageHead(page));
VM_BUG_ON(PageCompound(page_tail));
VM_BUG_ON(PageLRU(page_tail));
- VM_BUG_ON(!spin_is_locked(&zone->lru_lock));
+ VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&zone->lru_lock));
SetPageLRU(page_tail);
@@ -672,7 +672,6 @@ void lru_add_page_tail(struct zone* zone,
active = 0;
lru = LRU_INACTIVE_ANON;
}
- update_page_reclaim_stat(zone, page_tail, file, active);
} else {
SetPageUnevictable(page_tail);
lru = LRU_UNEVICTABLE;
@@ -693,6 +692,9 @@ void lru_add_page_tail(struct zone* zone,
list_head = page_tail->lru.prev;
list_move_tail(&page_tail->lru, list_head);
}
+
+ if (!PageUnevictable(page))
+ update_page_reclaim_stat(zone, page_tail, file, active);
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
@@ -710,8 +712,8 @@ static void __pagevec_lru_add_fn(struct page *page, void *arg)
SetPageLRU(page);
if (active)
SetPageActive(page);
- update_page_reclaim_stat(zone, page, file, active);
add_page_to_lru_list(zone, page, lru);
+ update_page_reclaim_stat(zone, page, file, active);
}
/*
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 470038a91873..ea6b32d61873 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -300,16 +300,6 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
new_page = alloc_page_vma(gfp_mask, vma, addr);
if (!new_page)
break; /* Out of memory */
- /*
- * The memcg-specific accounting when moving
- * pages around the LRU lists relies on the
- * page's owner (memcg) to be valid. Usually,
- * pages are assigned to a new owner before
- * being put on the LRU list, but since this
- * is not the case here, the stale owner from
- * a previous allocation cycle must be reset.
- */
- mem_cgroup_reset_owner(new_page);
}
/*
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 17:40:47 +0000