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Message-ID: <20091026162952.GA14684@linux.vnet.ibm.com>
Date: Mon, 26 Oct 2009 09:29:52 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: tip-bot for Ingo Molnar <mingo@...e.hu>
Cc: linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
hpa@...or.com, mingo@...hat.com, dhowells@...hat.com,
tglx@...utronix.de, josh@...htriplett.org
Subject: Re: [tip:core/rcu] rcu: Do tiny cleanups in rcutiny
On Mon, Oct 26, 2009 at 11:37:58AM +0000, tip-bot for Ingo Molnar wrote:
> Commit-ID: 4ce5b90340879ce93d169b7b523c2cbbe7c45843
> Gitweb: http://git.kernel.org/tip/4ce5b90340879ce93d169b7b523c2cbbe7c45843
> Author: Ingo Molnar <mingo@...e.hu>
> AuthorDate: Mon, 26 Oct 2009 07:55:55 +0100
> Committer: Ingo Molnar <mingo@...e.hu>
> CommitDate: Mon, 26 Oct 2009 09:40:40 +0100
>
> rcu: Do tiny cleanups in rcutiny
>
> No change in functionality - just straighten out a few small
> stylistic details.
These all look good to me.
Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Cc: David Howells <dhowells@...hat.com>
> Cc: Josh Triplett <josh@...htriplett.org>
> Cc: laijs@...fujitsu.com
> Cc: dipankar@...ibm.com
> Cc: mathieu.desnoyers@...ymtl.ca
> Cc: dvhltc@...ibm.com
> Cc: niv@...ibm.com
> Cc: peterz@...radead.org
> Cc: rostedt@...dmis.org
> Cc: Valdis.Kletnieks@...edu
> Cc: avi@...hat.com
> Cc: mtosatti@...hat.com
> LKML-Reference: <12565226351355-git-send-email->
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
> include/linux/rcutiny.h | 6 +---
> kernel/rcutiny.c | 49 ++++++++++++++++++++++------------------------
> 2 files changed, 25 insertions(+), 30 deletions(-)
>
> diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
> index 891073c..2c1fe83 100644
> --- a/include/linux/rcutiny.h
> +++ b/include/linux/rcutiny.h
> @@ -20,9 +20,8 @@
> * Author: Paul E. McKenney <paulmck@...ux.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
>
> diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
> index 0b54efd..b33ec3a 100644
> --- a/kernel/rcutiny.c
> +++ b/kernel/rcutiny.c
> @@ -20,22 +20,21 @@
> * Author: Paul E. McKenney <paulmck@...ux.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);
> }
> --
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