From: Kris Van Hees <kris.van.hees@oracle.com>
Date: Mon, 19 Aug 2013 18:07:13 +0000 (-0400)
Subject: dtrace: Ensure that task_struct members are initialized correctly
X-Git-Tag: v4.1.12-92~313^2~61
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=d58358a41d1930f93f80ff42343c90a4a16c50a0;p=users%2Fjedix%2Flinux-maple.git

dtrace: Ensure that task_struct members are initialized correctly

Due to an initialization issue with current->predcache, it was possible for the
predicate on a probe to never be evaluated because the dtrace_probe() code was
incorrectly assuming that there was a valid predicate cache result.

Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
---

diff --git a/kernel/dtrace/dtrace_os.c b/kernel/dtrace/dtrace_os.c
index 221aa3893330..bee4c551a5db 100644
--- a/kernel/dtrace/dtrace_os.c
+++ b/kernel/dtrace/dtrace_os.c
@@ -977,8 +977,15 @@ EXPORT_SYMBOL(dtrace_tracepoint_hit);
 
 void dtrace_task_init(struct task_struct *tsk)
 {
+	tsk->predcache = 0;
+	tsk->dtrace_vtime = ktime_set(0, 0);
+	tsk->dtrace_start = ktime_set(0, 0);
+	tsk->dtrace_stop = 0;
+	tsk->dtrace_sig = 0;
+
 	tsk->dtrace_helpers = NULL;
 	tsk->dtrace_probes = 0;
+	tsk->dtrace_tp_count = 0;
 }
 
 void dtrace_task_cleanup(struct task_struct *tsk)