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rcu: Do tiny cleanups in rcutiny 

No change in functionality - just straighten out a few small
stylistic details.

Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: avi@redhat.com
Cc: mtosatti@redhat.com
LKML-Reference: <12565226351355-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-10-26 07:55:55 +01:00
parent cf886c44ec
commit 4ce5b90340
2 changed files with 25 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/rcutiny.h
View File

@ -20,9 +20,8 @@
* Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
*
* For detailed explanation of Read-Copy Update mechanism see -
* Documentation/RCU
* Documentation/RCU
*/
#ifndef __LINUX_TINY_H
#define __LINUX_TINY_H
@ -70,8 +69,7 @@ static inline void synchronize_rcu_bh_expedited(void)
}
struct notifier_block;
extern int rcu_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu);
extern int rcu_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu);
#ifdef CONFIG_NO_HZ

49
kernel/rcutiny.c
View File

@ -20,22 +20,21 @@
* Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
*
* For detailed explanation of Read-Copy Update mechanism see -
* Documentation/RCU
* Documentation/RCU
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/rcupdate.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/moduleparam.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/rcupdate.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/cpu.h>
/* Global control variables for rcupdate callback mechanism. */
struct rcu_ctrlblk {
@ -46,14 +45,13 @@ struct rcu_ctrlblk {
/* Definition for rcupdate control block. */
static struct rcu_ctrlblk rcu_ctrlblk = {
.rcucblist = NULL,
.donetail = &rcu_ctrlblk.rcucblist,
.curtail = &rcu_ctrlblk.rcucblist,
.donetail = &rcu_ctrlblk.rcucblist,
.curtail = &rcu_ctrlblk.rcucblist,
};
static struct rcu_ctrlblk rcu_bh_ctrlblk = {
.rcucblist = NULL,
.donetail = &rcu_bh_ctrlblk.rcucblist,
.curtail = &rcu_bh_ctrlblk.rcucblist,
.donetail = &rcu_bh_ctrlblk.rcucblist,
.curtail = &rcu_bh_ctrlblk.rcucblist,
};
#ifdef CONFIG_NO_HZ
@ -84,8 +82,8 @@ void rcu_exit_nohz(void)
/*
* Helper function for rcu_qsctr_inc() and rcu_bh_qsctr_inc().
* Also disable irqs to avoid confusion due to interrupt handlers invoking
* call_rcu().
* Also disable irqs to avoid confusion due to interrupt handlers
* invoking call_rcu().
*/
static int rcu_qsctr_help(struct rcu_ctrlblk *rcp)
{
@ -99,6 +97,7 @@ static int rcu_qsctr_help(struct rcu_ctrlblk *rcp)
return 1;
}
local_irq_restore(flags);
return 0;
}
@ -143,8 +142,8 @@ void rcu_check_callbacks(int cpu, int user)
*/
static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp)
{
unsigned long flags;
struct rcu_head *next, *list;
unsigned long flags;
/* If no RCU callbacks ready to invoke, just return. */
if (&rcp->rcucblist == rcp->donetail)
@ -182,8 +181,7 @@ static void rcu_process_callbacks(struct softirq_action *unused)
* Null function to handle CPU being onlined. Longer term, we want to
* make TINY_RCU avoid using rcupdate.c, but later...
*/
int rcu_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
int rcu_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
{
return NOTIFY_OK;
}
@ -223,6 +221,7 @@ static void __call_rcu(struct rcu_head *head,
head->func = func;
head->next = NULL;
local_irq_save(flags);
*rcp->curtail = head;
rcp->curtail = &head->next;
@ -234,8 +233,7 @@ static void __call_rcu(struct rcu_head *head,
* period. But since we have but one CPU, that would be after any
* quiescent state.
*/
void call_rcu(struct rcu_head *head,
void (*func)(struct rcu_head *rcu))
void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
{
__call_rcu(head, func, &rcu_ctrlblk);
}
@ -245,8 +243,7 @@ EXPORT_SYMBOL_GPL(call_rcu);
* Post an RCU bottom-half callback to be invoked after any subsequent
* quiescent state.
*/
void call_rcu_bh(struct rcu_head *head,
void (*func)(struct rcu_head *rcu))
void call_rcu_bh(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
{
__call_rcu(head, func, &rcu_bh_ctrlblk);
}