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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-02-22 17:05:01 -0800
committerIngo Molnar <mingo@elte.hu>2010-02-25 10:34:57 +0100
commit20133cfce7d0bbdcc0c398301030c091f5675c88 (patch)
tree337f242bfc89f5880cf86234fa6b574f52a2f0a5 /kernel/rcutree_trace.c
parent1bd22e374b20c2f0ba1d2723c1f585acab2251c5 (diff)
downloadlinux-20133cfce7d0bbdcc0c398301030c091f5675c88.tar.bz2
rcu: Stop overflowing signed integers
The C standard does not specify the result of an operation that overflows a signed integer, so such operations need to be avoided. This patch changes the type of several fields from "long" to "unsigned long" and adjusts operations as needed. ULONG_CMP_GE() and ULONG_CMP_LT() macros are introduced to do the modular comparisons that are appropriate given that overflow is an expected event. Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1266887105-1528-17-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/rcutree_trace.c')
-rw-r--r--kernel/rcutree_trace.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 9d2c88423b31..d45db2e35d27 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -50,7 +50,7 @@ static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
{
if (!rdp->beenonline)
return;
- seq_printf(m, "%3d%cc=%ld g=%ld pq=%d pqc=%ld qp=%d",
+ seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pqc=%lu qp=%d",
rdp->cpu,
cpu_is_offline(rdp->cpu) ? '!' : ' ',
rdp->completed, rdp->gpnum,
@@ -105,7 +105,7 @@ static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
{
if (!rdp->beenonline)
return;
- seq_printf(m, "%d,%s,%ld,%ld,%d,%ld,%d",
+ seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d",
rdp->cpu,
cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
rdp->completed, rdp->gpnum,
@@ -155,13 +155,13 @@ static const struct file_operations rcudata_csv_fops = {
static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
{
- long gpnum;
+ unsigned long gpnum;
int level = 0;
int phase;
struct rcu_node *rnp;
gpnum = rsp->gpnum;
- seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x "
+ seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x "
"nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld\n",
rsp->completed, gpnum, rsp->signaled,
(long)(rsp->jiffies_force_qs - jiffies),
@@ -215,12 +215,12 @@ static const struct file_operations rcuhier_fops = {
static int show_rcugp(struct seq_file *m, void *unused)
{
#ifdef CONFIG_TREE_PREEMPT_RCU
- seq_printf(m, "rcu_preempt: completed=%ld gpnum=%ld\n",
+ seq_printf(m, "rcu_preempt: completed=%ld gpnum=%lu\n",
rcu_preempt_state.completed, rcu_preempt_state.gpnum);
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
- seq_printf(m, "rcu_sched: completed=%ld gpnum=%ld\n",
+ seq_printf(m, "rcu_sched: completed=%ld gpnum=%lu\n",
rcu_sched_state.completed, rcu_sched_state.gpnum);
- seq_printf(m, "rcu_bh: completed=%ld gpnum=%ld\n",
+ seq_printf(m, "rcu_bh: completed=%ld gpnum=%lu\n",
rcu_bh_state.completed, rcu_bh_state.gpnum);
return 0;
}