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Commit 962cf36c authored by Carlos R. Mafra's avatar Carlos R. Mafra Committed by Thomas Gleixner
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Remove argument from open_softirq which is always NULL 

As git-grep shows, open_softirq() is always called with the last argument
being NULL

block/blk-core.c:       open_softirq(BLOCK_SOFTIRQ, blk_done_softirq, NULL);
kernel/hrtimer.c:       open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq, NULL);
kernel/rcuclassic.c:    open_softirq(RCU_SOFTIRQ, rcu_process_callbacks, NULL);
kernel/rcupreempt.c:    open_softirq(RCU_SOFTIRQ, rcu_process_callbacks, NULL);
kernel/sched.c: open_softirq(SCHED_SOFTIRQ, run_rebalance_domains, NULL);
kernel/softirq.c:       open_softirq(TASKLET_SOFTIRQ, tasklet_action, NULL);
kernel/softirq.c:       open_softirq(HI_SOFTIRQ, tasklet_hi_action, NULL);
kernel/timer.c: open_softirq(TIMER_SOFTIRQ, run_timer_softirq, NULL);
net/core/dev.c: open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
net/core/dev.c: open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);

This observation has already been made by Matthew Wilcox in June 2002
(http://www.cs.helsinki.fi/linux/linux-kernel/2002-25/0687.html

)

"I notice that none of the current softirq routines use the data element
passed to them."

and the situation hasn't changed since them. So it appears we can safely
remove that extra argument to save 128 (54) bytes of kernel data (text).

Signed-off-by: default avatarCarlos R. Mafra <crmafra@ift.unesp.br>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 75d3bce2

block/blk-core.c

+1 −1
Original line number Diff line number Diff line
@@ -2048,7 +2048,7 @@ int __init blk_dev_init(void) 
	for_each_possible_cpu(i)

		INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i));



	open_softirq(BLOCK_SOFTIRQ, blk_done_softirq, NULL);

	open_softirq(BLOCK_SOFTIRQ, blk_done_softirq);

	register_hotcpu_notifier(&blk_cpu_notifier);



	return 0;

include/linux/interrupt.h

+1 −2
Original line number Diff line number Diff line
@@ -285,12 +285,11 @@ enum 
struct softirq_action

{

	void	(*action)(struct softirq_action *);

	void	*data;

};



asmlinkage void do_softirq(void);

asmlinkage void __do_softirq(void);

extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);

extern void open_softirq(int nr, void (*action)(struct softirq_action *));

extern void softirq_init(void);

#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)

extern void raise_softirq_irqoff(unsigned int nr);

kernel/hrtimer.c

+1 −1
Original line number Diff line number Diff line
@@ -1669,7 +1669,7 @@ void __init hrtimers_init(void) 
			  (void *)(long)smp_processor_id());

	register_cpu_notifier(&hrtimers_nb);

#ifdef CONFIG_HIGH_RES_TIMERS

	open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq, NULL);

	open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq);

#endif

}

kernel/rcuclassic.c

+1 −1
Original line number Diff line number Diff line
@@ -529,7 +529,7 @@ static void __cpuinit rcu_online_cpu(int cpu) 


	rcu_init_percpu_data(cpu, &rcu_ctrlblk, rdp);

	rcu_init_percpu_data(cpu, &rcu_bh_ctrlblk, bh_rdp);

	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks, NULL);

	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);

}



static int __cpuinit rcu_cpu_notify(struct notifier_block *self,

kernel/rcupreempt.c

+1 −1
Original line number Diff line number Diff line
@@ -1125,7 +1125,7 @@ void __init __rcu_init(void) 
	for_each_online_cpu(cpu)

		rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE,	(void *)(long) cpu);



	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks, NULL);

	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);

}



/*