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rcu: Changes from reviews: avoid casts, fix/add warnings, improve comments

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Changes suggested by review comments from Josh Triplett and
Mathieu Desnoyers.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
LKML-Reference: <20090827220012.GA30525@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney
2009-08-27 15:00:12 -07:00
committed by Ingo Molnar
parent dd5d19bafd
commit 868489660d
4 changed files with 17 additions and 12 deletions
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13
kernel/rcutree.c
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@@ -229,7 +229,6 @@ static int rcu_implicit_offline_qs(struct rcu_data *rdp)
#endif /* #ifdef CONFIG_SMP */
#ifdef CONFIG_NO_HZ
static DEFINE_RATELIMIT_STATE(rcu_rs, 10 * HZ, 5);
/**
* rcu_enter_nohz - inform RCU that current CPU is entering nohz
@@ -249,7 +248,7 @@ void rcu_enter_nohz(void)
rdtp = &__get_cpu_var(rcu_dynticks);
rdtp->dynticks++;
rdtp->dynticks_nesting--;
WARN_ON_RATELIMIT(rdtp->dynticks & 0x1, &rcu_rs);
WARN_ON_ONCE(rdtp->dynticks & 0x1);
local_irq_restore(flags);
}
@@ -268,7 +267,7 @@ void rcu_exit_nohz(void)
rdtp = &__get_cpu_var(rcu_dynticks);
rdtp->dynticks++;
rdtp->dynticks_nesting++;
WARN_ON_RATELIMIT(!(rdtp->dynticks & 0x1), &rcu_rs);
WARN_ON_ONCE(!(rdtp->dynticks & 0x1));
local_irq_restore(flags);
smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
}
@@ -287,7 +286,7 @@ void rcu_nmi_enter(void)
if (rdtp->dynticks & 0x1)
return;
rdtp->dynticks_nmi++;
WARN_ON_RATELIMIT(!(rdtp->dynticks_nmi & 0x1), &rcu_rs);
WARN_ON_ONCE(!(rdtp->dynticks_nmi & 0x1));
smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
}
@@ -306,7 +305,7 @@ void rcu_nmi_exit(void)
return;
smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
rdtp->dynticks_nmi++;
WARN_ON_RATELIMIT(rdtp->dynticks_nmi & 0x1, &rcu_rs);
WARN_ON_ONCE(rdtp->dynticks_nmi & 0x1);
}
/**
@@ -322,7 +321,7 @@ void rcu_irq_enter(void)
if (rdtp->dynticks_nesting++)
return;
rdtp->dynticks++;
WARN_ON_RATELIMIT(!(rdtp->dynticks & 0x1), &rcu_rs);
WARN_ON_ONCE(!(rdtp->dynticks & 0x1));
smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
}
@@ -341,7 +340,7 @@ void rcu_irq_exit(void)
return;
smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
rdtp->dynticks++;
WARN_ON_RATELIMIT(rdtp->dynticks & 0x1, &rcu_rs);
WARN_ON_ONCE(rdtp->dynticks & 0x1);
/* If the interrupt queued a callback, get out of dyntick mode. */
if (__get_cpu_var(rcu_sched_data).nxtlist ||