[tip:core/rcu] rcu: Make rcupreempt_trace.c look at offline CPUs

tip-bot for Paul E. McKenney
2009-08-15T17:08:19Z

Commit-ID: b612ba804b8a656333013ad2ee96fb2377df5dbb
Gitweb: http://git.kernel.org/tip/b612ba804b8a656333013ad2ee96fb2377df5dbb
Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
AuthorDate: Sat, 15 Aug 2009 09:53:50 -0700
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Sat, 15 Aug 2009 19:02:09 +0200

rcu: Make rcupreempt_trace.c look at offline CPUs

Given that offline CPUs can now have non-zero counters, we need
to dump counters for offline CPUs as well as for online CPUs.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: josht@linux.vnet.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: hugh.dickins@tiscali.co.uk
Cc: benh@kernel.crashing.org
LKML-Reference: <12503552313921-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>

---
kernel/rcupreempt_trace.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/rcupreempt_trace.c b/kernel/rcupreempt_trace.c
index 7c2665c..1164034 100644
--- a/kernel/rcupreempt_trace.c
+++ b/kernel/rcupreempt_trace.c
@@ -236,12 +236,13 @@ static ssize_t rcuctrs_read(struct file *filp, char __user *buffer,

cnt += snprintf(&rcupreempt_trace_buf[cnt], RCUPREEMPT_TRACE_BUF_SIZE,
"CPU last cur F M\n");
- for_each_online_cpu(cpu) {
+ for_each_possible_cpu(cpu) {
long *flipctr = rcupreempt_flipctr(cpu);
cnt += snprintf(&rcupreempt_trace_buf[cnt],
RCUPREEMPT_TRACE_BUF_SIZE - cnt,
- "%3d %4ld %3ld %d %d\n",
+ "%3d%c %4ld %3ld %d %d\n",
cpu,
+ cpu_is_offline(cpu) ? '!' : ' ',
flipctr[!f],
flipctr[f],
rcupreempt_flip_flag(cpu),