[PATCH] mm: update comment for DEFAULT_MAX_MAP_COUNT

[PATCH] mm: update comment for DEFAULT_MAX_MAP_COUNT

[Kirill A. Shutemov]

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

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 include/linux/sched/sysctl.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index 8045a554cafb..552a2db8b1f5 100644
--- 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)
-- 
2.0.0.rc0

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