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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-09-21 10:41:50 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-23 07:42:52 -0700
commit86f343b50bb9f56cce60fade22da9defff28934c (patch)
treec2951c5b76afcd56a3d9f4a5d1d40e95528f3bbe /kernel
parent22a767269a767b3ee91e4aaea353ac6bec6a912d (diff)
rcu: Fix CONFIG_RCU_FAST_NO_HZ stall warning message
The print_cpu_stall_fast_no_hz() function attempts to print -1 when the ->idle_gp_timer is not pending, but unsigned arithmetic causes it to instead print ULONG_MAX, which is 4294967295 on 32-bit systems and 18446744073709551615 on 64-bit systems. Neither of these are the most reader-friendly values, so this commit instead causes "timer not pending" to be printed when ->idle_gp_timer is not pending. Reported-by: Paul Walmsley <paul@pwsan.com> 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')
-rw-r--r--kernel/rcutree_plugin.h12
1 files changed, 8 insertions, 4 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index df47014e129..e12d07ba601 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -2130,11 +2130,15 @@ static void print_cpu_stall_fast_no_hz(char *cp, int cpu)
{
struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu);
struct timer_list *tltp = &rdtp->idle_gp_timer;
+ char c;
- sprintf(cp, "drain=%d %c timer=%lu",
- rdtp->dyntick_drain,
- rdtp->dyntick_holdoff == jiffies ? 'H' : '.',
- timer_pending(tltp) ? tltp->expires - jiffies : -1);
+ c = rdtp->dyntick_holdoff == jiffies ? 'H' : '.';
+ if (timer_pending(tltp))
+ sprintf(cp, "drain=%d %c timer=%lu",
+ rdtp->dyntick_drain, c, tltp->expires - jiffies);
+ else
+ sprintf(cp, "drain=%d %c timer not pending",
+ rdtp->dyntick_drain, c);
}
#else /* #ifdef CONFIG_RCU_FAST_NO_HZ */