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Thomas Gleixner
2b57c69917
Having the x86 specific interrupt statistics as a data structure with individual members instead of an array is just stupid as it requires endless copy and paste in arch_show_interrupts() and arch_irq_stat_cpu(), where the latter does not even take the latest interrupt additions into account. The resulting #ifdef orgy is just disgusting. Convert it to an array of counters, which does not make a difference in the actual interrupt hotpath increment as the array index is constant and therefore not any different than the member based access. But in arch_show_interrupts() and arch_irq_stat_cpu() this just turns into a loop, which reduces the text size by ~2k (~12%): text data bss dec hex filename 19643 15250 904 35797 8bd5 ../build/arch/x86/kernel/irq.o 17355 15250 904 33509 82e5 ../build/arch/x86/kernel/irq.o Adding a new vector or software counter only requires to update the table and everything just works. Using the core provided emit function which speeds up 0 outputs makes it significantly faster. Signed-off-by: Thomas Gleixner <tglx@kernel.org> Tested-by: Michael Kelley <mhklinux@outlook.com> Reviewed-by: Radu Rendec <radu@rendec.net> Link: https://patch.msgid.link/20260517194931.196070643@kernel.org
35 lines
688 B
C
35 lines
688 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* x86 specific code for irq_work
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*
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* Copyright (C) 2010 Red Hat, Inc., Peter Zijlstra
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*/
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#include <linux/kernel.h>
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#include <linux/irq_work.h>
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#include <linux/hardirq.h>
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#include <asm/apic.h>
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#include <asm/idtentry.h>
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#include <asm/trace/irq_vectors.h>
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#include <linux/interrupt.h>
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#ifdef CONFIG_X86_LOCAL_APIC
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DEFINE_IDTENTRY_SYSVEC(sysvec_irq_work)
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{
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apic_eoi();
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trace_irq_work_entry(IRQ_WORK_VECTOR);
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inc_irq_stat(IRQ_WORK);
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irq_work_run();
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trace_irq_work_exit(IRQ_WORK_VECTOR);
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}
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void arch_irq_work_raise(void)
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{
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if (!arch_irq_work_has_interrupt())
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return;
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__apic_send_IPI_self(IRQ_WORK_VECTOR);
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apic_wait_icr_idle();
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}
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#endif
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