As what Pavel Machek reported [1], some userspace applications depend on
bogomips showed by /proc/cpuinfo.
Although there is much less legacy impact on aarch64 than arm, but it does
break libvirt.
Basically, this patch reverts commit 326b16db9f69fd0d279be873c6c00f88c0a4aad5
("arm64: delay: don't bother reporting bogomips in /proc/cpuinfo"), but with
some tweak due to context change.
[1] https://lkml.org/lkml/2015/1/4/132
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> #3.12+
Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxx>
---
V2 --> V1:
* Remove double new line and unnecessary bogomips sum info
arch/arm64/kernel/cpuinfo.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 706679d..212ae63 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -30,6 +30,7 @@
#include <linux/seq_file.h>
#include <linux/sched.h>
#include <linux/smp.h>
+#include <linux/delay.h>
/*
* In case the boot CPU is hotpluggable, we record its initial state and
@@ -112,6 +113,10 @@ static int c_show(struct seq_file *m, void *v)
*/
seq_printf(m, "processor\t: %d\n", i);
+ seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
+ loops_per_jiffy / (500000UL/HZ),
+ loops_per_jiffy / (5000UL/HZ) % 100);
+
/*
* Dump out the common processor features in a single line.
* Userspace should read the hwcaps with getauxval(AT_HWCAP)
--
2.0.2
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