From: Kris Van Hees <kris.van.hees@oracle.com>
Date: Fri, 16 Dec 2016 18:04:52 +0000 (-0500)
Subject: dtrace: ensure that our die notifier gets executed amongst the first
X-Git-Tag: v4.1.12-92~25^2~2
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=8caffd5c0dc315de48e4ced5e896f3d29a8bbaa4;p=users%2Fjedix%2Flinux-maple.git

dtrace: ensure that our die notifier gets executed amongst the first

The die notifier is crucial for implementing safe memory access in
DTrace.  To avoid other handlers potentially causing interference, we
set the priority of our handler at the highest level.

Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Acked-by: David  Mc Lean <david.mclean@oracle.com>
---

diff --git a/kernel/dtrace/dtrace_os.c b/kernel/dtrace/dtrace_os.c
index 80144415ba06..19b8860c6670 100644
--- a/kernel/dtrace/dtrace_os.c
+++ b/kernel/dtrace/dtrace_os.c
@@ -7,6 +7,7 @@
 
 #include <linux/binfmts.h>
 #include <linux/dtrace_cpu.h>
+#include <linux/dtrace_fbt.h>
 #include <linux/dtrace_os.h>
 #include <linux/dtrace_sdt.h>
 #include <linux/fs.h>
@@ -436,6 +437,7 @@ EXPORT_SYMBOL(dtrace_stacktrace);
 \*---------------------------------------------------------------------------*/
 static struct notifier_block	dtrace_die = {
 	.notifier_call = dtrace_die_notifier,
+	.priority = 0x7fffffff
 };
 
 static int	dtrace_enabled = 0;