mm: update comment for DEFAULT_MAX_MAP_COUNT

With ELF extended numbering 16-bit bound is not hard limit any more. [[email protected]: fix typo] Signed-off-by: Kirill A. Shutemov <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
sum-it · Jun 4, 2014 · 3fb1c8d · 3fb1c8d
1 parent af4459d
commit 3fb1c8d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git 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 than 65535 sections, so 16-bit bound is
+ * not a 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)