add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/kernel/traps.c
..
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@@ -31,25 +31,29 @@
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 {
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 	static int die_counter;
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 	int ret;
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+	long cause;
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+	unsigned long flags;
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 	oops_enter();
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-	spin_lock_irq(&die_lock);
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+	spin_lock_irqsave(&die_lock, flags);
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 	console_verbose();
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 	bust_spinlocks(1);
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 	pr_emerg("%s [#%d]\n", str, ++die_counter);
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 	print_modules();
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-	show_regs(regs);
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+	if (regs)
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+		show_regs(regs);
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-	ret = notify_die(DIE_OOPS, str, regs, 0, regs->cause, SIGSEGV);
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+	cause = regs ? regs->cause : -1;
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+	ret = notify_die(DIE_OOPS, str, regs, 0, cause, SIGSEGV);
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-	if (regs && kexec_should_crash(current))
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+	if (kexec_should_crash(current))
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 		crash_kexec(regs);
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 	bust_spinlocks(0);
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 	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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-	spin_unlock_irq(&die_lock);
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+	spin_unlock_irqrestore(&die_lock, flags);
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 	oops_exit();
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 	if (in_interrupt())
..
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@@ -57,7 +61,7 @@
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 	if (panic_on_oops)
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 		panic("Fatal exception");
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 	if (ret != NOTIFY_STOP)
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-		do_exit(SIGSEGV);
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+		make_task_dead(SIGSEGV);
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 }
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 void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)