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Subject[PATCH v2] add cpu frequency to cpuinfo in arm64
Date
There is cpu frequency in /proc/cpuinfo in x86 but not in arm64

Signed-off-by: Chao Liu <liuchao173@huawei.com>
---
Change in v2:
- fix spelling errors and remove remove redundant blank line

arch/arm64/kernel/cpuinfo.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 591c18a889a5..39a36e6e8079 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -24,6 +24,7 @@
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/delay.h>
+#include <linux/cpufreq.h>

/*
* In case the boot CPU is hotpluggable, we record its initial state and
@@ -144,6 +145,7 @@ static int c_show(struct seq_file *m, void *v)
for_each_online_cpu(i) {
struct cpuinfo_arm64 *cpuinfo = &per_cpu(cpu_data, i);
u32 midr = cpuinfo->reg_midr;
+ unsigned int freq = cpufreq_quick_get(i);

/*
* glibc reads /proc/cpuinfo to determine the number of
@@ -159,6 +161,10 @@ static int c_show(struct seq_file *m, void *v)
loops_per_jiffy / (500000UL/HZ),
loops_per_jiffy / (5000UL/HZ) % 100);

+ if (freq)
+ seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
+ freq / 1000, (freq % 1000));
+
/*
* Dump out the common processor features in a single line.
* Userspace should read the hwcaps with getauxval(AT_HWCAP)
--
2.23.0
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