kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/arch/riscv/kernel/irq.c
..
..
@@ -7,53 +7,18 @@
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 #include <linux/interrupt.h>
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 #include <linux/irqchip.h>
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-#include <linux/irqdomain.h>
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+#include <linux/seq_file.h>
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+#include <asm/smp.h>
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-/*
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- * Possible interrupt causes:
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- */
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-#define INTERRUPT_CAUSE_SOFTWARE    1
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-#define INTERRUPT_CAUSE_TIMER       5
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-#define INTERRUPT_CAUSE_EXTERNAL    9
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-
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-/*
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- * The high order bit of the trap cause register is always set for
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- * interrupts, which allows us to differentiate them from exceptions
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- * quickly.  The INTERRUPT_CAUSE_* macros don't contain that bit, so we
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- * need to mask it off.
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- */
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-#define INTERRUPT_CAUSE_FLAG	(1UL << (__riscv_xlen - 1))
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-
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-asmlinkage void __irq_entry do_IRQ(struct pt_regs *regs, unsigned long cause)
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+int arch_show_interrupts(struct seq_file *p, int prec)
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 {
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-	struct pt_regs *old_regs = set_irq_regs(regs);
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-
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-	irq_enter();
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-	switch (cause & ~INTERRUPT_CAUSE_FLAG) {
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-	case INTERRUPT_CAUSE_TIMER:
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-		riscv_timer_interrupt();
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-		break;
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-#ifdef CONFIG_SMP
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-	case INTERRUPT_CAUSE_SOFTWARE:
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-		/*
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-		 * We only use software interrupts to pass IPIs, so if a non-SMP
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-		 * system gets one, then we don't know what to do.
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-		 */
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-		riscv_software_interrupt();
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-		break;
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-#endif
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-	case INTERRUPT_CAUSE_EXTERNAL:
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-		handle_arch_irq(regs);
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-		break;
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-	default:
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-		panic("unexpected interrupt cause");
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-	}
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-	irq_exit();
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-
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-	set_irq_regs(old_regs);
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+	show_ipi_stats(p, prec);
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+	return 0;
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 }
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18
 
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 void __init init_IRQ(void)
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 {
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 	irqchip_init();
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+	if (!handle_arch_irq)
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+		panic("No interrupt controller found.");
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 }