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Subject[PATCH tip/core/rcu 1/2] rcu: Apply review feedback from Josh Triplett, part 3
Date
Whitespace fixes, updated comments, and trivial code movement.

o Fix whitespace error in RCU_HEAD_INIT()

o Move "So where is rcu_write_lock()" comment so that it does
not come between the rcu_read_unlock() header comment and
the rcu_read_unlock() definition.

o Move the module_param statements for blimit, qhimark, and qlowmark
to immediately follow the corresponding definitions.

o In __rcu_offline_cpu(), move the assignment to rdp_me inside the
"if" statement, given that rdp_me is not used outside of that "if"
statement.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
include/linux/rcupdate.h | 14 +++++++-------
kernel/rcutree.c | 10 +++++-----
2 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index b2f1e10..6dd71fa 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -83,7 +83,7 @@ extern int rcu_scheduler_active;
#error "Unknown RCU implementation specified to kernel configuration"
#endif

-#define RCU_HEAD_INIT { .next = NULL, .func = NULL }
+#define RCU_HEAD_INIT { .next = NULL, .func = NULL }
#define RCU_HEAD(head) struct rcu_head head = RCU_HEAD_INIT
#define INIT_RCU_HEAD(ptr) do { \
(ptr)->next = NULL; (ptr)->func = NULL; \
@@ -135,12 +135,6 @@ static inline void rcu_read_lock(void)
rcu_read_acquire();
}

-/**
- * rcu_read_unlock - marks the end of an RCU read-side critical section.
- *
- * See rcu_read_lock() for more information.
- */
-
/*
* So where is rcu_write_lock()? It does not exist, as there is no
* way for writers to lock out RCU readers. This is a feature, not
@@ -150,6 +144,12 @@ static inline void rcu_read_lock(void)
* used as well. RCU does not care how the writers keep out of each
* others' way, as long as they do so.
*/
+
+/**
+ * rcu_read_unlock - marks the end of an RCU read-side critical section.
+ *
+ * See rcu_read_lock() for more information.
+ */
static inline void rcu_read_unlock(void)
{
rcu_read_release();
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 45eb2d1..1ccdd5b 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -121,6 +121,10 @@ static int blimit = 10; /* Maximum callbacks per softirq. */
static int qhimark = 10000; /* If this many pending, ignore blimit. */
static int qlowmark = 100; /* Once only this many pending, use blimit. */

+module_param(blimit, int, 0);
+module_param(qhimark, int, 0);
+module_param(qlowmark, int, 0);
+
static void force_quiescent_state(struct rcu_state *rsp, int relaxed);
static int rcu_pending(int cpu);

@@ -873,8 +877,8 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
* indefinitely delay callbacks, you have far worse things to
* be worrying about.
*/
- rdp_me = rsp->rda[smp_processor_id()];
if (rdp->nxtlist != NULL) {
+ rdp_me = rsp->rda[smp_processor_id()];
*rdp_me->nxttail[RCU_NEXT_TAIL] = rdp->nxtlist;
rdp_me->nxttail[RCU_NEXT_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
rdp->nxtlist = NULL;
@@ -1570,7 +1574,3 @@ void __init __rcu_init(void)
}

#include "rcutree_plugin.h"
-
-module_param(blimit, int, 0);
-module_param(qhimark, int, 0);
-module_param(qlowmark, int, 0);
--
1.5.2.5


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