proc.5: Note kernel version that introduced threads-max range checks

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man5/proc.5 b/man5/proc.5
index 83f30afdd91d8764f2e19eba15a05f9736223a9b..950aa5e1394661fd11c7a9c473779344eacf764a 100644 (file)
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -4269,8 +4269,13 @@ date following it indicates the time the kernel was built.
 This file specifies the system-wide limit on the number of
 threads (tasks) that can be created on the system.
 
-The minimum value that can be written to threads-max is 20.
-The maximum value that can be written to threads-max is given by the
+Since Linux 4.1,
+.\" commit 230633d109e35b0a24277498e773edeb79b4a331
+the value that can be written to
+.I threads-max
+is bounded.
+The minimum value that can be written is 20.
+The maximum value that can be written is given by the
 constant
 .B FUTEX_TID_MASK
 (0x3fffffff).