lkml.org 
[lkml]   [2008]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] Tracepoints fix reentrancy
The tracepoints had the same problem markers did have wrt reentrancy. Apply a
similar fix using a rcu_barrier after each tracepoint mutex lock.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Ingo Molnar <mingo@elte.hu>
CC: "Frank Ch. Eigler" <fche@redhat.com>
CC: Lai Jiangshan <laijs@cn.fujitsu.com>
---
kernel/tracepoint.c | 4 ++++
1 file changed, 4 insertions(+)

Index: linux-2.6-lttng/kernel/tracepoint.c
===================================================================
--- linux-2.6-lttng.orig/kernel/tracepoint.c 2008-09-30 01:38:39.000000000 -0400
+++ linux-2.6-lttng/kernel/tracepoint.c 2008-09-30 01:39:56.000000000 -0400
@@ -361,6 +361,8 @@ int tracepoint_probe_register(const char
mutex_lock(&tracepoints_mutex);
entry = get_tracepoint(name);
WARN_ON(!entry);
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
tracepoint_entry_free_old(entry, old);
end:
mutex_unlock(&tracepoints_mutex);
@@ -397,6 +399,8 @@ int tracepoint_probe_unregister(const ch
entry = get_tracepoint(name);
if (!entry)
goto end;
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
tracepoint_entry_free_old(entry, old);
remove_tracepoint(name); /* Ignore busy error message */
ret = 0;
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68

\
 
 \ /
  Last update: 2008-09-30 07:53    [W:0.024 / U:1.592 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site