Merge tag 'mm-hotfixes-stable-2023-09-05-11-51' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "Seven hotfixes. Four are cc:stable and the remainder pertain to issues
  which were introduced in the current merge window"

* tag 'mm-hotfixes-stable-2023-09-05-11-51' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  sparc64: add missing initialization of folio in tlb_batch_add()
  mm: memory-failure: use rcu lock instead of tasklist_lock when collect_procs()
  revert "memfd: improve userspace warnings for missing exec-related flags".
  rcu: dump vmalloc memory info safely
  mm/vmalloc: add a safer version of find_vm_area() for debug
  tools/mm: fix undefined reference to pthread_once
  memcontrol: ensure memcg acquired by id is properly set up

1 files changed, 8 insertions, 8 deletions

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 7b01fffe7a79..4d6e43c88489 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -547,8 +547,8 @@ static void kill_procs(struct list_head *to_kill, int forcekill, bool fail,
  * on behalf of the thread group. Return task_struct of the (first found)
  * dedicated thread if found, and return NULL otherwise.
  *
- * We already hold read_lock(&tasklist_lock) in the caller, so we don't
- * have to call rcu_read_lock/unlock() in this function.
+ * We already hold rcu lock in the caller, so we don't have to call
+ * rcu_read_lock/unlock() in this function.
  */
 static struct task_struct *find_early_kill_thread(struct task_struct *tsk)
 {
@@ -609,7 +609,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
 		return;
 
 	pgoff = page_to_pgoff(page);
-	read_lock(&tasklist_lock);
+	rcu_read_lock();
 	for_each_process(tsk) {
 		struct anon_vma_chain *vmac;
 		struct task_struct *t = task_early_kill(tsk, force_early);
@@ -626,7 +626,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
 			add_to_kill_anon_file(t, page, vma, to_kill);
 		}
 	}
-	read_unlock(&tasklist_lock);
+	rcu_read_unlock();
 	anon_vma_unlock_read(av);
 }
 
@@ -642,7 +642,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
 	pgoff_t pgoff;
 
 	i_mmap_lock_read(mapping);
-	read_lock(&tasklist_lock);
+	rcu_read_lock();
 	pgoff = page_to_pgoff(page);
 	for_each_process(tsk) {
 		struct task_struct *t = task_early_kill(tsk, force_early);
@@ -662,7 +662,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
 				add_to_kill_anon_file(t, page, vma, to_kill);
 		}
 	}
-	read_unlock(&tasklist_lock);
+	rcu_read_unlock();
 	i_mmap_unlock_read(mapping);
 }
 
@@ -685,7 +685,7 @@ static void collect_procs_fsdax(struct page *page,
 	struct task_struct *tsk;
 
 	i_mmap_lock_read(mapping);
-	read_lock(&tasklist_lock);
+	rcu_read_lock();
 	for_each_process(tsk) {
 		struct task_struct *t = task_early_kill(tsk, true);
 
@@ -696,7 +696,7 @@ static void collect_procs_fsdax(struct page *page,
 				add_to_kill_fsdax(t, page, vma, to_kill, pgoff);
 		}
 	}
-	read_unlock(&tasklist_lock);
+	rcu_read_unlock();
 	i_mmap_unlock_read(mapping);
 }
 #endif /* CONFIG_FS_DAX */