Merge tag 'mm-hotfixes-stable-2022-06-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull hotfixes from Andrew Morton:
 "Minor things, mainly - mailmap updates, MAINTAINERS updates, etc.

  Fixes for this merge window:

   - fix for a damon boot hang, from SeongJae

   - fix for a kfence warning splat, from Jason Donenfeld

   - fix for zero-pfn pinning, from Alex Williamson

   - fix for fallocate hole punch clearing, from Mike Kravetz

  Fixes for previous releases:

   - fix for a performance regression, from Marcelo

   - fix for a hwpoisining BUG from zhenwei pi"

* tag 'mm-hotfixes-stable-2022-06-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  mailmap: add entry for Christian Marangi
  mm/memory-failure: disable unpoison once hw error happens
  hugetlbfs: zero partial pages during fallocate hole punch
  mm: memcontrol: reference to tools/cgroup/memcg_slabinfo.py
  mm: re-allow pinning of zero pfns
  mm/kfence: select random number before taking raw lock
  MAINTAINERS: add maillist information for LoongArch
  MAINTAINERS: update MM tree references
  MAINTAINERS: update Abel Vesa's email
  MAINTAINERS: add MEMORY HOT(UN)PLUG section and add David as reviewer
  MAINTAINERS: add Miaohe Lin as a memory-failure reviewer
  mailmap: add alias for jarkko@profian.com
  mm/damon/reclaim: schedule 'damon_reclaim_timer' only after 'system_wq' is initialized
  kthread: make it clear that kthread_create_on_node() might be terminated by any fatal signal
  mm: lru_cache_disable: use synchronize_rcu_expedited
  mm/page_isolation.c: fix one kernel-doc comment

8 files changed, 31 insertions, 6 deletions

diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index 8efbfb24f3a1..4b07c29effe9 100644
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -374,6 +374,8 @@ static void damon_reclaim_timer_fn(struct work_struct *work)
 }
 static DECLARE_DELAYED_WORK(damon_reclaim_timer, damon_reclaim_timer_fn);
 
+static bool damon_reclaim_initialized;
+
 static int enabled_store(const char *val,
 		const struct kernel_param *kp)
 {
@@ -382,6 +384,10 @@ static int enabled_store(const char *val,
 	if (rc < 0)
 		return rc;
 
+	/* system_wq might not initialized yet */
+	if (!damon_reclaim_initialized)
+		return rc;
+
 	if (enabled)
 		schedule_delayed_work(&damon_reclaim_timer, 0);
 
@@ -449,6 +455,8 @@ static int __init damon_reclaim_init(void)
 	damon_add_target(ctx, target);
 
 	schedule_delayed_work(&damon_reclaim_timer, 0);
+
+	damon_reclaim_initialized = true;
 	return 0;
 }
 
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index 5c0cddd81505..65e242b5a432 100644
--- a/mm/hwpoison-inject.c
+++ b/mm/hwpoison-inject.c
@@ -48,7 +48,7 @@ static int hwpoison_inject(void *data, u64 val)
 
 inject:
 	pr_info("Injecting memory failure at pfn %#lx\n", pfn);
-	err = memory_failure(pfn, 0);
+	err = memory_failure(pfn, MF_SW_SIMULATED);
 	return (err == -EOPNOTSUPP) ? 0 : err;
 }
 
diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 4e7cd4c8e687..4b5e5a3d3a63 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -360,6 +360,9 @@ static void *kfence_guarded_alloc(struct kmem_cache *cache, size_t size, gfp_t g
 	unsigned long flags;
 	struct slab *slab;
 	void *addr;
+	const bool random_right_allocate = prandom_u32_max(2);
+	const bool random_fault = CONFIG_KFENCE_STRESS_TEST_FAULTS &&
+				  !prandom_u32_max(CONFIG_KFENCE_STRESS_TEST_FAULTS);
 
 	/* Try to obtain a free object. */
 	raw_spin_lock_irqsave(&kfence_freelist_lock, flags);
@@ -404,7 +407,7 @@ static void *kfence_guarded_alloc(struct kmem_cache *cache, size_t size, gfp_t g
 	 * is that the out-of-bounds accesses detected are deterministic for
 	 * such allocations.
 	 */
-	if (prandom_u32_max(2)) {
+	if (random_right_allocate) {
 		/* Allocate on the "right" side, re-calculate address. */
 		meta->addr += PAGE_SIZE - size;
 		meta->addr = ALIGN_DOWN(meta->addr, cache->align);
@@ -444,7 +447,7 @@ static void *kfence_guarded_alloc(struct kmem_cache *cache, size_t size, gfp_t g
 	if (cache->ctor)
 		cache->ctor(addr);
 
-	if (CONFIG_KFENCE_STRESS_TEST_FAULTS && !prandom_u32_max(CONFIG_KFENCE_STRESS_TEST_FAULTS))
+	if (random_fault)
 		kfence_protect(meta->addr); /* Random "faults" by protecting the object. */
 
 	atomic_long_inc(&counters[KFENCE_COUNTER_ALLOCATED]);
diff --git a/mm/madvise.c b/mm/madvise.c
index d7b4f2602949..0316bbc6441b 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1112,7 +1112,7 @@ static int madvise_inject_error(int behavior,
 		} else {
 			pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
 				 pfn, start);
-			ret = memory_failure(pfn, MF_COUNT_INCREASED);
+			ret = memory_failure(pfn, MF_COUNT_INCREASED | MF_SW_SIMULATED);
 			if (ret == -EOPNOTSUPP)
 				ret = 0;
 		}
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index abec50f31fe6..618c366a2f07 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4859,7 +4859,7 @@ static int mem_cgroup_slab_show(struct seq_file *m, void *p)
 {
 	/*
 	 * Deprecated.
-	 * Please, take a look at tools/cgroup/slabinfo.py .
+	 * Please, take a look at tools/cgroup/memcg_slabinfo.py .
 	 */
 	return 0;
 }
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index b85661cbdc4a..da39ec8afca8 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -69,6 +69,8 @@ int sysctl_memory_failure_recovery __read_mostly = 1;
 
 atomic_long_t num_poisoned_pages __read_mostly = ATOMIC_LONG_INIT(0);
 
+static bool hw_memory_failure __read_mostly = false;
+
 static bool __page_handle_poison(struct page *page)
 {
 	int ret;
@@ -1768,6 +1770,9 @@ int memory_failure(unsigned long pfn, int flags)
 
 	mutex_lock(&mf_mutex);
 
+	if (!(flags & MF_SW_SIMULATED))
+		hw_memory_failure = true;
+
 	p = pfn_to_online_page(pfn);
 	if (!p) {
 		res = arch_memory_failure(pfn, flags);
@@ -2103,6 +2108,13 @@ int unpoison_memory(unsigned long pfn)
 
 	mutex_lock(&mf_mutex);
 
+	if (hw_memory_failure) {
+		unpoison_pr_info("Unpoison: Disabled after HW memory failure %#lx\n",
+				 pfn, &unpoison_rs);
+		ret = -EOPNOTSUPP;
+		goto unlock_mutex;
+	}
+
 	if (!PageHWPoison(p)) {
 		unpoison_pr_info("Unpoison: Page was already unpoisoned %#lx\n",
 				 pfn, &unpoison_rs);
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index d200d41ad0d3..9d73dc38e3d7 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -286,6 +286,8 @@ __first_valid_page(unsigned long pfn, unsigned long nr_pages)
  * @flags:			isolation flags
  * @gfp_flags:			GFP flags used for migrating pages
  * @isolate_before:	isolate the pageblock before the boundary_pfn
+ * @skip_isolation:	the flag to skip the pageblock isolation in second
+ *			isolate_single_pageblock()
  *
  * Free and in-use pages can be as big as MAX_ORDER-1 and contain more than one
  * pageblock. When not all pageblocks within a page are isolated at the same
diff --git a/mm/swap.c b/mm/swap.c
index f3922a96b2e9..034bb24879a3 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -881,7 +881,7 @@ void lru_cache_disable(void)
 	 * lru_disable_count = 0 will have exited the critical
 	 * section when synchronize_rcu() returns.
 	 */
-	synchronize_rcu();
+	synchronize_rcu_expedited();
 #ifdef CONFIG_SMP
 	__lru_add_drain_all(true);
 #else