From e38cdccfb501b54ee710e138c62b4d5ca0b5200c Mon Sep 17 00:00:00 2001
From: Hang Xiaoqian <hangxiaoqian@wxiat.com>
Date: Wed, 24 Aug 2022 17:32:11 +0800
Subject: [PATCH] sw64: switch to generic calibrate_delay()

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56OLG

--------------------------------

There is no need to use per cpu loops_per_jiffy, so we
remove loops_per_jiffy from struct cpuinfo_sw64.

Signed-off-by: Hang Xiaoqian <hangxiaoqian@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>
---
 arch/sw_64/Kconfig               |  4 ++++
 arch/sw_64/include/asm/hw_init.h |  1 -
 arch/sw_64/kernel/setup.c        |  1 -
 arch/sw_64/kernel/smp.c          | 12 +-----------
 arch/sw_64/kernel/time.c         | 10 ++--------
 arch/sw_64/lib/udelay.c          |  6 ------
 drivers/cpufreq/sw64_cpufreq.c   |  4 +---
 7 files changed, 8 insertions(+), 30 deletions(-)

diff --git a/arch/sw_64/Kconfig b/arch/sw_64/Kconfig
index 392f7806afcb..36cddefb1ad4 100644
--- a/arch/sw_64/Kconfig
+++ b/arch/sw_64/Kconfig
@@ -142,6 +142,10 @@ config ARCH_HAS_ILOG2_U64
 config GENERIC_GPIO
 	bool
 
+config GENERIC_CALIBRATE_DELAY
+	bool
+	default y
+
 config ZONE_DMA32
 	bool
 	default y
diff --git a/arch/sw_64/include/asm/hw_init.h b/arch/sw_64/include/asm/hw_init.h
index a36c811839ea..e0a5706710cd 100644
--- a/arch/sw_64/include/asm/hw_init.h
+++ b/arch/sw_64/include/asm/hw_init.h
@@ -18,7 +18,6 @@ struct cache_desc {
 };
 
 struct cpuinfo_sw64 {
-	unsigned long loops_per_jiffy;
 	unsigned long last_asn;
 	unsigned long ipi_count;
 	struct cache_desc icache; /* Primary I-cache */
diff --git a/arch/sw_64/kernel/setup.c b/arch/sw_64/kernel/setup.c
index cb04aaa0cb97..2d2a8c6d4b4e 100644
--- a/arch/sw_64/kernel/setup.c
+++ b/arch/sw_64/kernel/setup.c
@@ -143,7 +143,6 @@ EXPORT_SYMBOL(screen_info);
  */
 void store_cpu_data(int cpu)
 {
-	cpu_data[cpu].loops_per_jiffy = loops_per_jiffy;
 	cpu_data[cpu].last_asn = ASN_FIRST_VERSION;
 }
 
diff --git a/arch/sw_64/kernel/smp.c b/arch/sw_64/kernel/smp.c
index f74b172ecb25..c0936d119c4e 100644
--- a/arch/sw_64/kernel/smp.c
+++ b/arch/sw_64/kernel/smp.c
@@ -374,18 +374,8 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
 
 void __init native_smp_cpus_done(unsigned int max_cpus)
 {
-	int cpu;
-	unsigned long bogosum = 0;
-
-	for (cpu = 0; cpu < NR_CPUS; cpu++)
-		if (cpu_online(cpu))
-			bogosum += cpu_data[cpu].loops_per_jiffy;
-
 	smp_booted = 1;
-	pr_info("SMP: Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
-		num_online_cpus(),
-		(bogosum + 2500) / (500000/HZ),
-		((bogosum + 2500) / (5000/HZ)) % 100);
+	pr_info("SMP: Total of %d processors activated.\n", num_online_cpus());
 }
 
 int setup_profiling_timer(unsigned int multiplier)
diff --git a/arch/sw_64/kernel/time.c b/arch/sw_64/kernel/time.c
index 6a4c8a31465c..3aa55c886e38 100644
--- a/arch/sw_64/kernel/time.c
+++ b/arch/sw_64/kernel/time.c
@@ -111,14 +111,8 @@ time_init(void)
 	of_clk_init(NULL);
 	/* Startup the timer source. */
 	setup_timer();
-}
-
-void calibrate_delay(void)
-{
-	loops_per_jiffy = get_cpu_freq() / HZ;
-	pr_info("Clock rate yields %lu.%02lu BogoMIPS (lpj=%lu)\n",
-			loops_per_jiffy / (500000 / HZ),
-			(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
+	/* Calibrate the delay loop directly */
+	lpj_fine = cycle_freq / HZ;
 }
 
 static void __init calibrate_sched_clock(void)
diff --git a/arch/sw_64/lib/udelay.c b/arch/sw_64/lib/udelay.c
index 48356ab8872f..59ca8a97d748 100644
--- a/arch/sw_64/lib/udelay.c
+++ b/arch/sw_64/lib/udelay.c
@@ -28,12 +28,6 @@ void __delay(unsigned long loops)
 }
 EXPORT_SYMBOL(__delay);
 
-#ifdef CONFIG_SMP
-#define LPJ	 cpu_data[smp_processor_id()].loops_per_jiffy
-#else
-#define LPJ	 loops_per_jiffy
-#endif
-
 void udelay(unsigned long usecs)
 {
 	unsigned long loops = usecs * get_cpu_freq() / 1000000;
diff --git a/drivers/cpufreq/sw64_cpufreq.c b/drivers/cpufreq/sw64_cpufreq.c
index b8cd37dac0d9..71f944de934b 100644
--- a/drivers/cpufreq/sw64_cpufreq.c
+++ b/drivers/cpufreq/sw64_cpufreq.c
@@ -40,10 +40,8 @@ static int sw64_cpu_freq_notifier(struct notifier_block *nb,
 	unsigned long cpu;
 
 	for_each_online_cpu(cpu) {
-		if (val == CPUFREQ_POSTCHANGE) {
+		if (val == CPUFREQ_POSTCHANGE)
 			sw64_update_clockevents(cpu, freqs->new * 1000);
-			current_cpu_data.loops_per_jiffy = loops_per_jiffy;
-		}
 	}
 
 	return 0;
-- 
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