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rcu: Eliminate a few CONFIG_RCU_NOCB_CPU_ALL #ifdefs

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This commit converts several CONFIG_RCU_NOCB_CPU_ALL #ifdefs to
instead use IS_ENABLED().  This change should help avoid hiding
code from compiler diagnostics.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2015-03-04 15:41:24 -08:00
parent 2927a689e8
commit 3382adbc1b
3 changed files with 14 additions and 14 deletions
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4
include/linux/rcupdate.h
View File

@ -1153,13 +1153,13 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
#define kfree_rcu(ptr, rcu_head) \
__kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head))
#if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL)
#ifdef CONFIG_TINY_RCU
static inline int rcu_needs_cpu(unsigned long *delta_jiffies)
{
*delta_jiffies = ULONG_MAX;
return 0;
}
#endif /* #if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL) */
#endif /* #ifdef CONFIG_TINY_RCU */
#if defined(CONFIG_RCU_NOCB_CPU_ALL)
static inline bool rcu_is_nocb_cpu(int cpu) { return true; }

2
include/linux/rcutree.h
View File

@ -31,9 +31,7 @@
#define __LINUX_RCUTREE_H
void rcu_note_context_switch(void);
#ifndef CONFIG_RCU_NOCB_CPU_ALL
int rcu_needs_cpu(unsigned long *delta_jiffies);
#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
void rcu_cpu_stall_reset(void);
/*

22
kernel/rcu/tree_plugin.h
View File

@ -1372,13 +1372,12 @@ static void rcu_prepare_kthreads(int cpu)
* Because we not have RCU_FAST_NO_HZ, just check whether this CPU needs
* any flavor of RCU.
*/
#ifndef CONFIG_RCU_NOCB_CPU_ALL
int rcu_needs_cpu(unsigned long *delta_jiffies)
{
*delta_jiffies = ULONG_MAX;
return rcu_cpu_has_callbacks(NULL);
return IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL)
? 0 : rcu_cpu_has_callbacks(NULL);
}
#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
/*
* Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up
@ -1485,11 +1484,15 @@ static bool __maybe_unused rcu_try_advance_all_cbs(void)
*
* The caller must have disabled interrupts.
*/
#ifndef CONFIG_RCU_NOCB_CPU_ALL
int rcu_needs_cpu(unsigned long *dj)
{
struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
if (IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL)) {
*dj = ULONG_MAX;
return 0;
}
/* Snapshot to detect later posting of non-lazy callback. */
rdtp->nonlazy_posted_snap = rdtp->nonlazy_posted;
@ -1516,7 +1519,6 @@ int rcu_needs_cpu(unsigned long *dj)
}
return 0;
}
#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
/*
* Prepare a CPU for idle from an RCU perspective. The first major task
@ -1530,7 +1532,6 @@ int rcu_needs_cpu(unsigned long *dj)
*/
static void rcu_prepare_for_idle(void)
{
#ifndef CONFIG_RCU_NOCB_CPU_ALL
bool needwake;
struct rcu_data *rdp;
struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
@ -1538,6 +1539,9 @@ static void rcu_prepare_for_idle(void)
struct rcu_state *rsp;
int tne;
if (IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL))
return;
/* Handle nohz enablement switches conservatively. */
tne = READ_ONCE(tick_nohz_active);
if (tne != rdtp->tick_nohz_enabled_snap) {
@ -1585,7 +1589,6 @@ static void rcu_prepare_for_idle(void)
if (needwake)
rcu_gp_kthread_wake(rsp);
}
#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
}
/*
@ -1595,12 +1598,11 @@ static void rcu_prepare_for_idle(void)
*/
static void rcu_cleanup_after_idle(void)
{
#ifndef CONFIG_RCU_NOCB_CPU_ALL
if (rcu_is_nocb_cpu(smp_processor_id()))
if (IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL) ||
rcu_is_nocb_cpu(smp_processor_id()))
return;
if (rcu_try_advance_all_cbs())
invoke_rcu_core();
#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
}
/*