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When CONFIG_IRQ_WORK is not defined (difficult to do, as it also requires CONFIG_PRINTK not to be defined), we get a build failure: kernel/built-in.o: In function `flush_smp_call_function_queue': kernel/smp.c:263: undefined reference to `irq_work_run' kernel/smp.c:263: undefined reference to `irq_work_run' Makefile:933: recipe for target 'vmlinux' failed Simplest thing to do is to make irq_work_run() a nop when not set. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20150319101851.4d224d9b@gandalf.local.home Signed-off-by: Ingo Molnar <mingo@kernel.org>
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
#ifndef _LINUX_IRQ_WORK_H
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#define _LINUX_IRQ_WORK_H
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#include <linux/llist.h>
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/*
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* An entry can be in one of four states:
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*
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* free NULL, 0 -> {claimed} : free to be used
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* claimed NULL, 3 -> {pending} : claimed to be enqueued
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* pending next, 3 -> {busy} : queued, pending callback
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* busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed
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*/
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#define IRQ_WORK_PENDING 1UL
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#define IRQ_WORK_BUSY 2UL
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#define IRQ_WORK_FLAGS 3UL
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#define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */
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struct irq_work {
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unsigned long flags;
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struct llist_node llnode;
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void (*func)(struct irq_work *);
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};
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static inline
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void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
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{
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work->flags = 0;
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work->func = func;
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}
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#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), }
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bool irq_work_queue(struct irq_work *work);
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#ifdef CONFIG_SMP
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bool irq_work_queue_on(struct irq_work *work, int cpu);
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#endif
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void irq_work_tick(void);
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void irq_work_sync(struct irq_work *work);
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#ifdef CONFIG_IRQ_WORK
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#include <asm/irq_work.h>
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void irq_work_run(void);
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bool irq_work_needs_cpu(void);
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#else
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static inline bool irq_work_needs_cpu(void) { return false; }
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static inline void irq_work_run(void) { }
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#endif
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#endif /* _LINUX_IRQ_WORK_H */
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