diff options
Diffstat (limited to 'arch/parisc/kernel/irq.c')
| -rw-r--r-- | arch/parisc/kernel/irq.c | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c index 9c2d953f3de..2e6443b1e92 100644 --- a/arch/parisc/kernel/irq.c +++ b/arch/parisc/kernel/irq.c @@ -27,11 +27,11 @@ #include <linux/interrupt.h> #include <linux/kernel_stat.h> #include <linux/seq_file.h> -#include <linux/spinlock.h> #include <linux/types.h> #include <asm/io.h> #include <asm/smp.h> +#include <asm/ldcw.h> #undef PARISC_IRQ_CR16_COUNTS @@ -172,10 +172,6 @@ int arch_show_interrupts(struct seq_file *p, int prec) for_each_online_cpu(j) seq_printf(p, "%10u ", irq_stats(j)->irq_stack_usage); seq_puts(p, " Interrupt stack usage\n"); - seq_printf(p, "%*s: ", prec, "ISC"); - for_each_online_cpu(j) - seq_printf(p, "%10u ", irq_stats(j)->irq_stack_counter); - seq_puts(p, " Interrupt stack usage counter\n"); # endif #endif #ifdef CONFIG_SMP @@ -384,6 +380,24 @@ static inline int eirr_to_irq(unsigned long eirr) return (BITS_PER_LONG - bit) + TIMER_IRQ; } +#ifdef CONFIG_IRQSTACKS +/* + * IRQ STACK - used for irq handler + */ +#define IRQ_STACK_SIZE (4096 << 2) /* 16k irq stack size */ + +union irq_stack_union { + unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)]; + volatile unsigned int slock[4]; + volatile unsigned int lock[1]; +}; + +DEFINE_PER_CPU(union irq_stack_union, irq_stack_union) = { + .slock = { 1,1,1,1 }, + }; +#endif + + int sysctl_panic_on_stackoverflow = 1; static inline void stack_overflow_check(struct pt_regs *regs) @@ -450,27 +464,26 @@ panic_check: } #ifdef CONFIG_IRQSTACKS -DEFINE_PER_CPU(union irq_stack_union, irq_stack_union) = { - .lock = __RAW_SPIN_LOCK_UNLOCKED((irq_stack_union).lock) - }; +/* in entry.S: */ +void call_on_stack(unsigned long p1, void *func, unsigned long new_stack); static void execute_on_irq_stack(void *func, unsigned long param1) { union irq_stack_union *union_ptr; unsigned long irq_stack; - raw_spinlock_t *irq_stack_in_use; + volatile unsigned int *irq_stack_in_use; union_ptr = &per_cpu(irq_stack_union, smp_processor_id()); irq_stack = (unsigned long) &union_ptr->stack; - irq_stack = ALIGN(irq_stack + sizeof(irq_stack_union.lock), + irq_stack = ALIGN(irq_stack + sizeof(irq_stack_union.slock), 64); /* align for stack frame usage */ /* We may be called recursive. If we are already using the irq stack, * just continue to use it. Use spinlocks to serialize * the irq stack usage. */ - irq_stack_in_use = &union_ptr->lock; - if (!raw_spin_trylock(irq_stack_in_use)) { + irq_stack_in_use = (volatile unsigned int *)__ldcw_align(union_ptr); + if (!__ldcw(irq_stack_in_use)) { void (*direct_call)(unsigned long p1) = func; /* We are using the IRQ stack already. @@ -482,10 +495,8 @@ static void execute_on_irq_stack(void *func, unsigned long param1) /* This is where we switch to the IRQ stack. */ call_on_stack(param1, func, irq_stack); - __inc_irq_stat(irq_stack_counter); - /* free up irq stack usage. */ - do_raw_spin_unlock(irq_stack_in_use); + *irq_stack_in_use = 1; } asmlinkage void do_softirq(void) |