d96b51ec14
The logic to detect if the irq stack was already in use with raw_spin_trylock() is wrong, because it will generate a "trylock failure on UP" error message with CONFIG_SMP=n and CONFIG_DEBUG_SPINLOCK=y. arch_spin_trylock() can't be used either since in the CONFIG_SMP=n case no atomic protection is given and we are reentrant here. A mutex didn't worked either and brings more overhead by turning off interrupts. So, let's use the fastest path for parisc which is the ldcw instruction. Counting how often the irq stack was used is pretty useless, so just drop this piece of code. Signed-off-by: Helge Deller <deller@gmx.de>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/* hardirq.h: PA-RISC hard IRQ support.
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*
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* Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>
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* Copyright (C) 2013 Helge Deller <deller@gmx.de>
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*/
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#ifndef _PARISC_HARDIRQ_H
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#define _PARISC_HARDIRQ_H
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#include <linux/cache.h>
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#include <linux/threads.h>
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#include <linux/irq.h>
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#ifdef CONFIG_IRQSTACKS
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#define __ARCH_HAS_DO_SOFTIRQ
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#endif
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typedef struct {
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unsigned int __softirq_pending;
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unsigned int kernel_stack_usage;
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unsigned int irq_stack_usage;
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#ifdef CONFIG_SMP
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unsigned int irq_resched_count;
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unsigned int irq_call_count;
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#endif
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unsigned int irq_unaligned_count;
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unsigned int irq_fpassist_count;
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unsigned int irq_tlb_count;
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} ____cacheline_aligned irq_cpustat_t;
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DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
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#define __ARCH_IRQ_STAT
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#define __IRQ_STAT(cpu, member) (irq_stat[cpu].member)
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#define inc_irq_stat(member) this_cpu_inc(irq_stat.member)
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#define __inc_irq_stat(member) __this_cpu_inc(irq_stat.member)
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#define local_softirq_pending() this_cpu_read(irq_stat.__softirq_pending)
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#define __ARCH_SET_SOFTIRQ_PENDING
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#define set_softirq_pending(x) \
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this_cpu_write(irq_stat.__softirq_pending, (x))
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#define or_softirq_pending(x) this_cpu_or(irq_stat.__softirq_pending, (x))
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#define ack_bad_irq(irq) WARN(1, "unexpected IRQ trap at vector %02x\n", irq)
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#endif /* _PARISC_HARDIRQ_H */
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