kasan: move and simplify kasan_report_async

Place kasan_report_async() next to the other main reporting routines.
Also simplify printed information.

Link: https://lkml.kernel.org/r/52d942ef3ffd29bdfa225bbe8e327bc5bda7ab09.1646237226.git.andreyknvl@google.comSigned-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/kasan/report.c

@@ -392,20 +392,6 @@ static bool report_enabled(void)
 	return !test_and_set_bit(KASAN_BIT_REPORTED, &kasan_flags);
 }
 
-#ifdef CONFIG_KASAN_HW_TAGS
-void kasan_report_async(void)
-{
-	unsigned long flags;
-
-	start_report(&flags, false);
-	pr_err("BUG: KASAN: invalid-access\n");
-	pr_err("Asynchronous mode enabled: no access details available\n");
-	pr_err("\n");
-	dump_stack_lvl(KERN_ERR);
-	end_report(&flags, NULL);
-}
-#endif /* CONFIG_KASAN_HW_TAGS */
-
 static void print_report(struct kasan_access_info *info)
 {
 	void *tagged_addr = info->access_addr;
@@ -477,6 +463,20 @@ bool kasan_report(unsigned long addr, size_t size, bool is_write,
 	return ret;
 }
 
+#ifdef CONFIG_KASAN_HW_TAGS
+void kasan_report_async(void)
+{
+	unsigned long flags;
+
+	start_report(&flags, false);
+	pr_err("BUG: KASAN: invalid-access\n");
+	pr_err("Asynchronous fault: no details available\n");
+	pr_err("\n");
+	dump_stack_lvl(KERN_ERR);
+	end_report(&flags, NULL);
+}
+#endif /* CONFIG_KASAN_HW_TAGS */
+
 #ifdef CONFIG_KASAN_INLINE
 /*
  * With CONFIG_KASAN_INLINE, accesses to bogus pointers (outside the high