0fa0ebbf15
Impact: allocate irq_desc_ptrs in preparation for making it variable-sized.
This addresses this memory usage bump when NR_CPUS bumped from 128 to 4096:
34816 +229376 264192 +658% irq_desc_ptrs(.data.read_mostly)
The patch is split into two parts, the first simply allocates the
irq_desc_ptrs array. Then next will deal with making it variable.
This is only when CONFIG_SPARSE_IRQS=y.
Signed-off-by: Mike Travis <travis@sgi.com>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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* IRQ subsystem internal functions and variables:
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*/
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extern int noirqdebug;
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/* Set default functions for irq_chip structures: */
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extern void irq_chip_set_defaults(struct irq_chip *chip);
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/* Set default handler: */
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extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
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extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
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unsigned long flags);
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extern struct lock_class_key irq_desc_lock_class;
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extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
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extern spinlock_t sparse_irq_lock;
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#ifdef CONFIG_SPARSE_IRQ
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/* irq_desc_ptrs allocated at boot time */
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extern struct irq_desc **irq_desc_ptrs;
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#else
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/* irq_desc_ptrs is a fixed size array */
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extern struct irq_desc *irq_desc_ptrs[NR_IRQS];
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#endif
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#ifdef CONFIG_PROC_FS
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extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
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extern void register_handler_proc(unsigned int irq, struct irqaction *action);
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extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
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#else
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static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
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static inline void register_handler_proc(unsigned int irq,
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struct irqaction *action) { }
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static inline void unregister_handler_proc(unsigned int irq,
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struct irqaction *action) { }
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#endif
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extern int irq_select_affinity_usr(unsigned int irq);
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/*
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* Debugging printout:
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*/
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#include <linux/kallsyms.h>
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#define P(f) if (desc->status & f) printk("%14s set\n", #f)
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static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
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{
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printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n",
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irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled);
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printk("->handle_irq(): %p, ", desc->handle_irq);
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print_symbol("%s\n", (unsigned long)desc->handle_irq);
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printk("->chip(): %p, ", desc->chip);
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print_symbol("%s\n", (unsigned long)desc->chip);
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printk("->action(): %p\n", desc->action);
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if (desc->action) {
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printk("->action->handler(): %p, ", desc->action->handler);
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print_symbol("%s\n", (unsigned long)desc->action->handler);
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}
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P(IRQ_INPROGRESS);
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P(IRQ_DISABLED);
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P(IRQ_PENDING);
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P(IRQ_REPLAY);
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P(IRQ_AUTODETECT);
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P(IRQ_WAITING);
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P(IRQ_LEVEL);
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P(IRQ_MASKED);
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#ifdef CONFIG_IRQ_PER_CPU
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P(IRQ_PER_CPU);
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#endif
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P(IRQ_NOPROBE);
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P(IRQ_NOREQUEST);
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P(IRQ_NOAUTOEN);
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}
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#undef P
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