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softirq: Add support for triggering softirq work on softirqs.

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This is basically a genericization of Jens Axboe's block layer
remote softirq changes.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
David S. Miller
2008-09-23 22:15:57 -07:00
committed by Jens Axboe
parent 2e532d68a2
commit 54514a70ad
3 changed files with 153 additions and 1 deletions
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21
include/linux/interrupt.h
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@ -11,6 +11,8 @@
#include <linux/hardirq.h>
#include <linux/sched.h>
#include <linux/irqflags.h>
#include <linux/smp.h>
#include <linux/percpu.h>
#include <asm/atomic.h>
#include <asm/ptrace.h>
#include <asm/system.h>
@ -273,6 +275,25 @@ extern void softirq_init(void);
extern void raise_softirq_irqoff(unsigned int nr);
extern void raise_softirq(unsigned int nr);
/* This is the worklist that queues up per-cpu softirq work.
*
* send_remote_sendirq() adds work to these lists, and
* the softirq handler itself dequeues from them. The queues
* are protected by disabling local cpu interrupts and they must
* only be accessed by the local cpu that they are for.
*/
DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
/* Try to send a softirq to a remote cpu. If this cannot be done, the
* work will be queued to the local cpu.
*/
extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
/* Like send_remote_softirq(), but the caller must disable local cpu interrupts
* and compute the current cpu, passed in as 'this_cpu'.
*/
extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
int this_cpu, int softirq);
/* Tasklets --- multithreaded analogue of BHs.