add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/kernel/time.c
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@@ -1,14 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright 2001 MontaVista Software Inc.
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  * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
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  * Copyright (c) 2003, 2004  Maciej W. Rozycki
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  *
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  * Common time service routines for MIPS machines.
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- *
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- * This program is free software; you can redistribute	it and/or modify it
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- * under  the terms of	the GNU General	 Public License as published by the
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- * Free Software Foundation;  either version 2 of the  License, or (at your
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- * option) any later version.
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  */
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 #include <linux/bug.h>
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 #include <linux/clockchips.h>
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@@ -40,8 +36,10 @@
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 static int cpufreq_callback(struct notifier_block *nb,
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 			    unsigned long val, void *data)
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 {
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-	int cpu;
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 	struct cpufreq_freqs *freq = data;
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+	struct cpumask *cpus = freq->policy->cpus;
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+	unsigned long lpj;
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+	int cpu;
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 	/*
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 	 * Skip lpj numbers adjustment if the CPU-freq transition is safe for
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@@ -62,7 +60,6 @@
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 		}
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 	}
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-	cpu = freq->cpu;
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 	/*
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 	 * Adjust global lpj variable and per-CPU udelay_val number in
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 	 * accordance with the new CPU frequency.
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@@ -73,8 +70,12 @@
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 						glb_lpj_ref_freq,
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 						freq->new);
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-		cpu_data[cpu].udelay_val = cpufreq_scale(per_cpu(pcp_lpj_ref, cpu),
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-					   per_cpu(pcp_lpj_ref_freq, cpu), freq->new);
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+		for_each_cpu(cpu, cpus) {
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+			lpj = cpufreq_scale(per_cpu(pcp_lpj_ref, cpu),
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+					    per_cpu(pcp_lpj_ref_freq, cpu),
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+					    freq->new);
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+			cpu_data[cpu].udelay_val = (unsigned int)lpj;
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+		}
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 	}
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 	return NOTIFY_OK;
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@@ -140,15 +141,10 @@
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 	case CPU_R4400MC:
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 		/*
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 		 * The published errata for the R4400 up to 3.0 say the CPU
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-		 * has the mfc0 from count bug.
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+		 * has the mfc0 from count bug.  This seems the last version
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+		 * produced.
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 		 */
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-		if ((current_cpu_data.processor_id & 0xff) <= 0x30)
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-			return 1;
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-
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-		/*
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-		 * we assume newer revisions are ok
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-		 */
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-		return 0;
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+		return 1;
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 	}
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 	return 0;