mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-30 22:26:55 +00:00
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>
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_IRQ_H
|
|
#define _ASM_X86_IRQ_H
|
|
/*
|
|
* (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
|
|
*
|
|
* IRQ/IPI changes taken from work by Thomas Radke
|
|
* <tomsoft@informatik.tu-chemnitz.de>
|
|
*/
|
|
|
|
#include <asm/apicdef.h>
|
|
#include <asm/irq_vectors.h>
|
|
|
|
/*
|
|
* The irq entry code is in the noinstr section and the start/end of
|
|
* __irqentry_text is emitted via labels. Make the build fail if
|
|
* something moves a C function into the __irq_entry section.
|
|
*/
|
|
#define __irq_entry __invalid_section
|
|
|
|
static inline int irq_canonicalize(int irq)
|
|
{
|
|
return ((irq == 2) ? 9 : irq);
|
|
}
|
|
|
|
extern int irq_init_percpu_irqstack(unsigned int cpu);
|
|
|
|
struct irq_desc;
|
|
|
|
extern void fixup_irqs(void);
|
|
|
|
#ifdef CONFIG_HAVE_KVM
|
|
extern void kvm_set_posted_intr_wakeup_handler(void (*handler)(void));
|
|
#endif
|
|
|
|
extern void (*x86_platform_ipi_callback)(void);
|
|
extern void native_init_IRQ(void);
|
|
|
|
extern void __handle_irq(struct irq_desc *desc, struct pt_regs *regs);
|
|
|
|
extern void init_ISA_irqs(void);
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
|
|
int exclude_cpu);
|
|
|
|
#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_IRQ_H */
|