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authorLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 11:39:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 11:39:33 -0700
commit81e11336d97e7a4c25a65c302ef2bf9cd9808ed4 (patch)
tree44e069e0bb26068137a1bda7ca5125c5b068b4ab /kernel
parent5631c5e0eb9035d92ceb20fcd9cdb7779a3f5cc7 (diff)
parent912c05720f00d039103d356a59c37dc7c3995e01 (diff)
Merge branch 'akpm' (patches from Andrew)
Merge misc updates from Andrew Morton: - a few MM hotfixes - kthread, tools, scripts, ntfs and ocfs2 - some of MM Subsystems affected by this patch series: kthread, tools, scripts, ntfs, ocfs2 and mm (hofixes, pagealloc, slab-generic, slab, slub, kcsan, debug, pagecache, gup, swap, shmem, memcg, pagemap, mremap, mincore, sparsemem, vmalloc, kasan, pagealloc, hugetlb and vmscan). * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (162 commits) mm: vmscan: consistent update to pgrefill mm/vmscan.c: fix typo khugepaged: khugepaged_test_exit() check mmget_still_valid() khugepaged: retract_page_tables() remember to test exit khugepaged: collapse_pte_mapped_thp() protect the pmd lock khugepaged: collapse_pte_mapped_thp() flush the right range mm/hugetlb: fix calculation of adjust_range_if_pmd_sharing_possible mm: thp: replace HTTP links with HTTPS ones mm/page_alloc: fix memalloc_nocma_{save/restore} APIs mm/page_alloc.c: skip setting nodemask when we are in interrupt mm/page_alloc: fallbacks at most has 3 elements mm/page_alloc: silence a KASAN false positive mm/page_alloc.c: remove unnecessary end_bitidx for [set|get]_pfnblock_flags_mask() mm/page_alloc.c: simplify pageblock bitmap access mm/page_alloc.c: extract the common part in pfn_to_bitidx() mm/page_alloc.c: replace the definition of NR_MIGRATETYPE_BITS with PB_migratetype_bits mm/shuffle: remove dynamic reconfiguration mm/memory_hotplug: document why shuffle_zone() is relevant mm/page_alloc: remove nr_free_pagecache_pages() mm: remove vm_total_pages ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c54
-rw-r--r--kernel/kthread.c8
-rw-r--r--kernel/power/snapshot.c2
-rw-r--r--kernel/rcu/tree.c2
-rw-r--r--kernel/scs.c2
-rw-r--r--kernel/sysctl.c2
6 files changed, 27 insertions, 43 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 76d3f3387554..35e9894d394c 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -261,7 +261,7 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
THREAD_SIZE_ORDER);
if (likely(page)) {
- tsk->stack = page_address(page);
+ tsk->stack = kasan_reset_tag(page_address(page));
return tsk->stack;
}
return NULL;
@@ -276,13 +276,8 @@ static inline void free_thread_stack(struct task_struct *tsk)
if (vm) {
int i;
- for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
- mod_memcg_page_state(vm->pages[i],
- MEMCG_KERNEL_STACK_KB,
- -(int)(PAGE_SIZE / 1024));
-
+ for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++)
memcg_kmem_uncharge_page(vm->pages[i], 0);
- }
for (i = 0; i < NR_CACHED_STACKS; i++) {
if (this_cpu_cmpxchg(cached_stacks[i],
@@ -307,6 +302,7 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk,
{
unsigned long *stack;
stack = kmem_cache_alloc_node(thread_stack_cache, THREADINFO_GFP, node);
+ stack = kasan_reset_tag(stack);
tsk->stack = stack;
return stack;
}
@@ -382,31 +378,14 @@ static void account_kernel_stack(struct task_struct *tsk, int account)
void *stack = task_stack_page(tsk);
struct vm_struct *vm = task_stack_vm_area(tsk);
- BUILD_BUG_ON(IS_ENABLED(CONFIG_VMAP_STACK) && PAGE_SIZE % 1024 != 0);
-
- if (vm) {
- int i;
-
- BUG_ON(vm->nr_pages != THREAD_SIZE / PAGE_SIZE);
- for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
- mod_zone_page_state(page_zone(vm->pages[i]),
- NR_KERNEL_STACK_KB,
- PAGE_SIZE / 1024 * account);
- }
- } else {
- /*
- * All stack pages are in the same zone and belong to the
- * same memcg.
- */
- struct page *first_page = virt_to_page(stack);
-
- mod_zone_page_state(page_zone(first_page), NR_KERNEL_STACK_KB,
- THREAD_SIZE / 1024 * account);
-
- mod_memcg_obj_state(stack, MEMCG_KERNEL_STACK_KB,
- account * (THREAD_SIZE / 1024));
- }
+ /* All stack pages are in the same node. */
+ if (vm)
+ mod_lruvec_page_state(vm->pages[0], NR_KERNEL_STACK_KB,
+ account * (THREAD_SIZE / 1024));
+ else
+ mod_lruvec_slab_state(stack, NR_KERNEL_STACK_KB,
+ account * (THREAD_SIZE / 1024));
}
static int memcg_charge_kernel_stack(struct task_struct *tsk)
@@ -415,24 +394,23 @@ static int memcg_charge_kernel_stack(struct task_struct *tsk)
struct vm_struct *vm = task_stack_vm_area(tsk);
int ret;
+ BUILD_BUG_ON(IS_ENABLED(CONFIG_VMAP_STACK) && PAGE_SIZE % 1024 != 0);
+
if (vm) {
int i;
+ BUG_ON(vm->nr_pages != THREAD_SIZE / PAGE_SIZE);
+
for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
/*
* If memcg_kmem_charge_page() fails, page->mem_cgroup
- * pointer is NULL, and both memcg_kmem_uncharge_page()
- * and mod_memcg_page_state() in free_thread_stack()
- * will ignore this page. So it's safe.
+ * pointer is NULL, and memcg_kmem_uncharge_page() in
+ * free_thread_stack() will ignore this page.
*/
ret = memcg_kmem_charge_page(vm->pages[i], GFP_KERNEL,
0);
if (ret)
return ret;
-
- mod_memcg_page_state(vm->pages[i],
- MEMCG_KERNEL_STACK_KB,
- PAGE_SIZE / 1024);
}
}
#endif
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 1d9e2fdfd67a..b2807e7be772 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -480,7 +480,6 @@ EXPORT_SYMBOL(kthread_bind);
* to "name.*%u". Code fills in cpu number.
*
* Description: This helper function creates and names a kernel thread
- * The thread will be woken and put into park mode.
*/
struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
void *data, unsigned int cpu,
@@ -1241,13 +1240,16 @@ void kthread_use_mm(struct mm_struct *mm)
WARN_ON_ONCE(tsk->mm);
task_lock(tsk);
+ /* Hold off tlb flush IPIs while switching mm's */
+ local_irq_disable();
active_mm = tsk->active_mm;
if (active_mm != mm) {
mmgrab(mm);
tsk->active_mm = mm;
}
tsk->mm = mm;
- switch_mm(active_mm, mm, tsk);
+ switch_mm_irqs_off(active_mm, mm, tsk);
+ local_irq_enable();
task_unlock(tsk);
#ifdef finish_arch_post_lock_switch
finish_arch_post_lock_switch();
@@ -1276,9 +1278,11 @@ void kthread_unuse_mm(struct mm_struct *mm)
task_lock(tsk);
sync_mm_rss(mm);
+ local_irq_disable();
tsk->mm = NULL;
/* active_mm is still 'mm' */
enter_lazy_tlb(mm, tsk);
+ local_irq_enable();
task_unlock(tsk);
}
EXPORT_SYMBOL_GPL(kthread_unuse_mm);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index cef154261fe2..d25749bce7cf 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1663,7 +1663,7 @@ static unsigned long minimum_image_size(unsigned long saveable)
{
unsigned long size;
- size = global_node_page_state(NR_SLAB_RECLAIMABLE)
+ size = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B)
+ global_node_page_state(NR_ACTIVE_ANON)
+ global_node_page_state(NR_INACTIVE_ANON)
+ global_node_page_state(NR_ACTIVE_FILE)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index ac7198ed3197..8ce77d9ac716 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -59,6 +59,7 @@
#include <linux/sched/clock.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
+#include <linux/kasan.h>
#include "../time/tick-internal.h"
#include "tree.h"
@@ -2890,6 +2891,7 @@ __call_rcu(struct rcu_head *head, rcu_callback_t func)
head->func = func;
head->next = NULL;
local_irq_save(flags);
+ kasan_record_aux_stack(head);
rdp = this_cpu_ptr(&rcu_data);
/* Add the callback to our list. */
diff --git a/kernel/scs.c b/kernel/scs.c
index 5d4d9bbdec36..4ff4a7ba0094 100644
--- a/kernel/scs.c
+++ b/kernel/scs.c
@@ -17,7 +17,7 @@ static void __scs_account(void *s, int account)
{
struct page *scs_page = virt_to_page(s);
- mod_zone_page_state(page_zone(scs_page), NR_KERNEL_SCS_KB,
+ mod_node_page_state(page_pgdat(scs_page), NR_KERNEL_SCS_KB,
account * (SCS_SIZE / SZ_1K));
}
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 1b4d2dc270a5..f785de3caac0 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2671,7 +2671,7 @@ static struct ctl_table vm_table[] = {
.data = &sysctl_overcommit_memory,
.maxlen = sizeof(sysctl_overcommit_memory),
.mode = 0644,
- .proc_handler = proc_dointvec_minmax,
+ .proc_handler = overcommit_policy_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = &two,
},