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rcu: Shrink ->dynticks_{nmi_,}nesting from long long to long

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Because the ->dynticks_nesting field now only contains the process-based
nesting level instead of a value encoding both the process nesting level
and the irq "nesting" level, we no longer need a long long, even on
32-bit systems.  This commit therefore changes both the ->dynticks_nesting
and ->dynticks_nmi_nesting fields to long.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2017-10-04 15:55:16 -07:00
parent bd2b879a1c
commit 84585aa8b6
5 changed files with 11 additions and 11 deletions
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8
include/trace/events/rcu.h
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@ -436,14 +436,14 @@ TRACE_EVENT(rcu_fqs,
*/ */
TRACE_EVENT(rcu_dyntick, TRACE_EVENT(rcu_dyntick,
TP_PROTO(const char *polarity, long long oldnesting, long long newnesting), TP_PROTO(const char *polarity, long oldnesting, long newnesting),
TP_ARGS(polarity, oldnesting, newnesting), TP_ARGS(polarity, oldnesting, newnesting),
TP_STRUCT__entry( TP_STRUCT__entry(
__field(const char *, polarity) __field(const char *, polarity)
__field(long long, oldnesting) __field(long, oldnesting)
__field(long long, newnesting) __field(long, newnesting)
), ),
TP_fast_assign( TP_fast_assign(
@ -452,7 +452,7 @@ TRACE_EVENT(rcu_dyntick,
__entry->newnesting = newnesting; __entry->newnesting = newnesting;
), ),
TP_printk("%s %llx %llx", __entry->polarity, TP_printk("%s %lx %lx", __entry->polarity,
__entry->oldnesting, __entry->newnesting) __entry->oldnesting, __entry->newnesting)
); );

2
kernel/rcu/rcu.h
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@ -31,7 +31,7 @@
#endif /* #else #ifdef CONFIG_RCU_TRACE */ #endif /* #else #ifdef CONFIG_RCU_TRACE */
/* Offset to allow for unmatched rcu_irq_{enter,exit}(). */ /* Offset to allow for unmatched rcu_irq_{enter,exit}(). */
#define DYNTICK_IRQ_NONIDLE ((INT_MAX / 2) + 1) #define DYNTICK_IRQ_NONIDLE ((LONG_MAX / 2) + 1)
/* /*

6
kernel/rcu/tree.c
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@ -946,7 +946,7 @@ void rcu_irq_exit_irqson(void)
* we really have exited idle, and must do the appropriate accounting. * we really have exited idle, and must do the appropriate accounting.
* The caller must have disabled interrupts. * The caller must have disabled interrupts.
*/ */
static void rcu_eqs_exit_common(long long newval, int user) static void rcu_eqs_exit_common(long newval, int user)
{ {
RCU_TRACE(struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);) RCU_TRACE(struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);)
@ -979,7 +979,7 @@ static void rcu_eqs_exit_common(long long newval, int user)
static void rcu_eqs_exit(bool user) static void rcu_eqs_exit(bool user)
{ {
struct rcu_dynticks *rdtp; struct rcu_dynticks *rdtp;
long long oldval; long oldval;
lockdep_assert_irqs_disabled(); lockdep_assert_irqs_disabled();
rdtp = this_cpu_ptr(&rcu_dynticks); rdtp = this_cpu_ptr(&rcu_dynticks);
@ -1043,7 +1043,7 @@ void rcu_user_exit(void)
void rcu_nmi_enter(void) void rcu_nmi_enter(void)
{ {
struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks); struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
int incby = 2; long incby = 2;
/* Complain about underflow. */ /* Complain about underflow. */
WARN_ON_ONCE(rdtp->dynticks_nmi_nesting < 0); WARN_ON_ONCE(rdtp->dynticks_nmi_nesting < 0);

4
kernel/rcu/tree.h
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@ -38,8 +38,8 @@
* Dynticks per-CPU state. * Dynticks per-CPU state.
*/ */
struct rcu_dynticks { struct rcu_dynticks {
long long dynticks_nesting; /* Track irq/process nesting level. */ long dynticks_nesting; /* Track process nesting level. */
int dynticks_nmi_nesting; /* Track NMI nesting level. */ long dynticks_nmi_nesting; /* Track irq/NMI nesting level. */
atomic_t dynticks; /* Even value for idle, else odd. */ atomic_t dynticks; /* Even value for idle, else odd. */
bool rcu_need_heavy_qs; /* GP old, need heavy quiescent state. */ bool rcu_need_heavy_qs; /* GP old, need heavy quiescent state. */
unsigned long rcu_qs_ctr; /* Light universal quiescent state ctr. */ unsigned long rcu_qs_ctr; /* Light universal quiescent state ctr. */

2
kernel/rcu/tree_plugin.h
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@ -1687,7 +1687,7 @@ static void print_cpu_stall_info(struct rcu_state *rsp, int cpu)
} }
print_cpu_stall_fast_no_hz(fast_no_hz, cpu); print_cpu_stall_fast_no_hz(fast_no_hz, cpu);
delta = rdp->mynode->gpnum - rdp->rcu_iw_gpnum; delta = rdp->mynode->gpnum - rdp->rcu_iw_gpnum;
pr_err("\t%d-%c%c%c%c: (%lu %s) idle=%03x/%llx/%d softirq=%u/%u fqs=%ld %s\n", pr_err("\t%d-%c%c%c%c: (%lu %s) idle=%03x/%ld/%ld softirq=%u/%u fqs=%ld %s\n",
cpu, cpu,
"O."[!!cpu_online(cpu)], "O."[!!cpu_online(cpu)],
"o."[!!(rdp->grpmask & rdp->mynode->qsmaskinit)], "o."[!!(rdp->grpmask & rdp->mynode->qsmaskinit)],