0366a1c70b
Nowadays, irq_exit() calls __do_softirq() pretty much directly instead of calling do_softirq() which switches to the decicated softirq stack. This has lead to observed stack overflows on powerpc since we call irq_enter() and irq_exit() outside of the scope that switches to the irq stack. This fixes it by moving the stack switching up a level, making irq_enter() and irq_exit() run off the irq stack. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
#ifdef __KERNEL__
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#ifndef _ASM_POWERPC_IRQ_H
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#define _ASM_POWERPC_IRQ_H
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/irqdomain.h>
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#include <linux/threads.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <asm/types.h>
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#include <linux/atomic.h>
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extern atomic_t ppc_n_lost_interrupts;
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/* This number is used when no interrupt has been assigned */
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#define NO_IRQ (0)
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/* Total number of virq in the platform */
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#define NR_IRQS CONFIG_NR_IRQS
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/* Same thing, used by the generic IRQ code */
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#define NR_IRQS_LEGACY NUM_ISA_INTERRUPTS
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extern irq_hw_number_t virq_to_hw(unsigned int virq);
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/**
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* irq_early_init - Init irq remapping subsystem
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*/
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extern void irq_early_init(void);
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static __inline__ int irq_canonicalize(int irq)
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{
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return irq;
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}
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extern int distribute_irqs;
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struct irqaction;
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struct pt_regs;
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#define __ARCH_HAS_DO_SOFTIRQ
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#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
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/*
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* Per-cpu stacks for handling critical, debug and machine check
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* level interrupts.
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*/
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extern struct thread_info *critirq_ctx[NR_CPUS];
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extern struct thread_info *dbgirq_ctx[NR_CPUS];
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extern struct thread_info *mcheckirq_ctx[NR_CPUS];
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extern void exc_lvl_ctx_init(void);
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#else
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#define exc_lvl_ctx_init()
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#endif
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/*
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* Per-cpu stacks for handling hard and soft interrupts.
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*/
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extern struct thread_info *hardirq_ctx[NR_CPUS];
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extern struct thread_info *softirq_ctx[NR_CPUS];
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extern void irq_ctx_init(void);
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extern void call_do_softirq(struct thread_info *tp);
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extern void call_do_irq(struct pt_regs *regs, struct thread_info *tp);
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extern void do_IRQ(struct pt_regs *regs);
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extern void __do_irq(struct pt_regs *regs);
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int irq_choose_cpu(const struct cpumask *mask);
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#endif /* _ASM_IRQ_H */
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#endif /* __KERNEL__ */
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