Merge branch 'akpm' (patches from Andrew)

Merge fixes from Andrew Morton:
 "Two patches.

  Subsystems affected by this patch series: mm/kasan and mm/debug"

* emailed patches from Andrew Morton <[email protected]>:
  docs: vm/page_owner: use literal blocks for param description
  kasan: prevent cpu_quarantine corruption when CPU offline and cache shrink occur at same time

Author: torvalds

Documentation/vm/page_owner.rst

@@ -110,7 +110,7 @@ Usage
    If you want to sort by the page nums of buf, use the ``-m`` parameter.
    The detailed parameters are:
 
-   fundamental function:
+   fundamental function::
 
 	Sort:
 		-a		Sort by memory allocation time.
@@ -122,7 +122,7 @@ Usage
 		-s		Sort by stack trace.
 		-t		Sort by times (default).
 
-   additional function:
+   additional function::
 
 	Cull:
 		--cull <rules>
@@ -153,6 +153,7 @@ Usage
 
 STANDARD FORMAT SPECIFIERS
 ==========================
+::
 
 	KEY		LONG		DESCRIPTION
 	p		pid		process ID

mm/kasan/quarantine.c

@@ -315,6 +315,13 @@ static void per_cpu_remove_cache(void *arg)
 	struct qlist_head *q;
 
 	q = this_cpu_ptr(&cpu_quarantine);
+	/*
+	 * Ensure the ordering between the writing to q->offline and
+	 * per_cpu_remove_cache.  Prevent cpu_quarantine from being corrupted
+	 * by interrupt.
+	 */
+	if (READ_ONCE(q->offline))
+		return;
 	qlist_move_cache(q, &to_free, cache);
 	qlist_free_all(&to_free, cache);
 }