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rcu: Fix tracing formatting 

The rcu_state structure's ->completed field is unsigned long, so this
commit adjusts show_one_rcugp()'s printf() format to suit.  Also add
the required ACCESS_ONCE() directives while we are in this function.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
hifive-unleashed-5.1
Paul E. McKenney 2012-09-28 10:49:58 -07:00
parent 5f4ee1fa16
commit 42c3533eee
2 changed files with 14 additions and 11 deletions
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4
kernel/rcutree.c
View File

@ -68,8 +68,8 @@ static struct lock_class_key rcu_fqs_class[RCU_NUM_LVLS];
.level = { &sname##_state.node[0] }, \
.call = cr, \
.fqs_state = RCU_GP_IDLE, \
.gpnum = -300, \
.completed = -300, \
.gpnum = 0UL - 300UL, \
.completed = 0UL - 300UL, \
.orphan_lock = __RAW_SPIN_LOCK_UNLOCKED(&sname##_state.orphan_lock), \
.orphan_nxttail = &sname##_state.orphan_nxtlist, \
.orphan_donetail = &sname##_state.orphan_donelist, \

21
kernel/rcutree_trace.c
View File

@ -46,6 +46,8 @@
#define RCU_TREE_NONCORE
#include "rcutree.h"
#define ulong2long(a) (*(long *)(&(a)))
static int r_open(struct inode *inode, struct file *file,
const struct seq_operations *op)
{
@ -116,10 +118,10 @@ static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
{
if (!rdp->beenonline)
return;
seq_printf(m, "%3d%cc=%lu g=%lu pq=%d qp=%d",
seq_printf(m, "%3d%cc=%ld g=%ld pq=%d qp=%d",
rdp->cpu,
cpu_is_offline(rdp->cpu) ? '!' : ' ',
rdp->completed, rdp->gpnum,
ulong2long(rdp->completed), ulong2long(rdp->gpnum),
rdp->passed_quiesce, rdp->qs_pending);
seq_printf(m, " dt=%d/%llx/%d df=%lu",
atomic_read(&rdp->dynticks->dynticks),
@ -246,8 +248,9 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
struct rcu_node *rnp;
gpnum = rsp->gpnum;
seq_printf(m, "%s: c=%lu g=%lu s=%d jfq=%ld j=%x ",
rsp->name, rsp->completed, gpnum, rsp->fqs_state,
seq_printf(m, "%s: c=%ld g=%ld s=%d jfq=%ld j=%x ",
rsp->name, ulong2long(rsp->completed), ulong2long(gpnum),
rsp->fqs_state,
(long)(rsp->jiffies_force_qs - jiffies),
(int)(jiffies & 0xffff));
seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
@ -301,16 +304,16 @@ static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp)
struct rcu_node *rnp = &rsp->node[0];
raw_spin_lock_irqsave(&rnp->lock, flags);
completed = rsp->completed;
gpnum = rsp->gpnum;
if (rsp->completed == rsp->gpnum)
completed = ACCESS_ONCE(rsp->completed);
gpnum = ACCESS_ONCE(rsp->gpnum);
if (completed == gpnum)
gpage = 0;
else
gpage = jiffies - rsp->gp_start;
gpmax = rsp->gp_max;
raw_spin_unlock_irqrestore(&rnp->lock, flags);
seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n",
rsp->name, completed, gpnum, gpage, gpmax);
seq_printf(m, "%s: completed=%ld gpnum=%ld age=%ld max=%ld\n",
rsp->name, ulong2long(completed), ulong2long(gpnum), gpage, gpmax);
}
static int show_rcugp(struct seq_file *m, void *unused)