mm: update comment for DEFAULT_MAX_MAP_COUNT

With ELF extended numbering 16-bit bound is not hard limit any more.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index 8045a554cafb87074a29ab7e73f9255681744bf5..552a2db8b1f50a7c981a3d98cfb76487e71965c7 100644 (file)
--- a/include/linux/sched/sysctl.h
+++ b/include/linux/sched/sysctl.h
@@ -25,6 +25,10 @@ enum { sysctl_hung_task_timeout_secs = 0 };
  * Because the kernel adds some informative sections to a image of program at
  * generating coredump, we need some margin. The number of extra sections is
  * 1-3 now and depends on arch. We use "5" as safe margin, here.
+ *
+ * ELF extended numbering allows more then 65535 sections, so 16-bit bound is
+ * not hard limit any more. Although some userspace tools can be surprised by
+ * that.
  */
 #define MAPCOUNT_ELF_CORE_MARGIN       (5)
 #define DEFAULT_MAX_MAP_COUNT  (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)