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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-09-24 16:08:31 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-10-23 14:46:47 -0700
commit489832609a1ad7189d11715d8cefb457d90182c5 (patch)
treeb4ba989f1852cdda9fac8c4671c21522b730c69a /kernel/rcutorture.c
parentabfd6e58aed4f89fd69b9b17bc4b4527efe3a645 (diff)
rcu: Make rcutorture give diagnostics if CPU offline fails
This commit causes rcutorture to print the errno if cpu_down() fails when the rcutorture "verbose" module parameter is specified. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutorture.c')
-rw-r--r--kernel/rcutorture.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index aaa7b9f3532a..9900f560f1bd 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -1502,6 +1502,7 @@ rcu_torture_onoff(void *arg)
unsigned long delta;
int maxcpu = -1;
DEFINE_RCU_RANDOM(rand);
+ int ret;
unsigned long starttime;
VERBOSE_PRINTK_STRING("rcu_torture_onoff task started");
@@ -1522,7 +1523,13 @@ rcu_torture_onoff(void *arg)
torture_type, cpu);
starttime = jiffies;
n_offline_attempts++;
- if (cpu_down(cpu) == 0) {
+ ret = cpu_down(cpu);
+ if (ret) {
+ if (verbose)
+ pr_alert("%s" TORTURE_FLAG
+ "rcu_torture_onoff task: offline %d failed: errno %d\n",
+ torture_type, cpu, ret);
+ } else {
if (verbose)
pr_alert("%s" TORTURE_FLAG
"rcu_torture_onoff task: offlined %d\n",