8d539b84f1
The APIs that allow backtracing across CPUs have always had a way to exclude the current CPU. This convenience means callers didn't need to find a place to allocate a CPU mask just to handle the common case. Let's extend the API to take a CPU ID to exclude instead of just a boolean. This isn't any more complex for the API to handle and allows the hardlockup detector to exclude a different CPU (the one it already did a trace for) without needing to find space for a CPU mask. Arguably, this new API also encourages safer behavior. Specifically if the caller wants to avoid tracing the current CPU (maybe because they already traced the current CPU) this makes it more obvious to the caller that they need to make sure that the current CPU ID can't change. [akpm@linux-foundation.org: fix trigger_allbutcpu_cpu_backtrace() stub] Link: https://lkml.kernel.org/r/20230804065935.v4.1.Ia35521b91fc781368945161d7b28538f9996c182@changeid Signed-off-by: Douglas Anderson <dianders@chromium.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: kernel test robot <lkp@intel.com> Cc: Lecopzer Chen <lecopzer.chen@mediatek.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Pingfan Liu <kernelfans@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
48 lines
808 B
C
48 lines
808 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ARM_IRQ_H
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#define __ASM_ARM_IRQ_H
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#define NR_IRQS_LEGACY 16
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#ifndef CONFIG_SPARSE_IRQ
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#include <mach/irqs.h>
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#else
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#define NR_IRQS NR_IRQS_LEGACY
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#endif
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#ifndef irq_canonicalize
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#define irq_canonicalize(i) (i)
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#endif
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/*
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* Use this value to indicate lack of interrupt
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* capability
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*/
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#ifndef NO_IRQ
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#define NO_IRQ ((unsigned int)(-1))
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#endif
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#ifndef __ASSEMBLY__
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struct irqaction;
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struct pt_regs;
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void handle_IRQ(unsigned int, struct pt_regs *);
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#ifdef CONFIG_SMP
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#include <linux/cpumask.h>
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extern void arch_trigger_cpumask_backtrace(const cpumask_t *mask,
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int exclude_cpu);
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#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
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#endif
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static inline int nr_legacy_irqs(void)
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{
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return NR_IRQS_LEGACY;
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}
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#endif
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#endif
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