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FAILED: patch "[PATCH] arm64: restore bogomips information in /proc/cpuinfo" failed to apply to 4.3-stable tree

PATCH [email protected] 1 participant 1 message Jan 27, 2016

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The patch below does not apply to the 4.3-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

Quoted 1 line

From 92e788b749862ebe9920360513a718e5dd4da7a9 Mon Sep 17 00:00:00 2001

From: Yang Shi <[email protected]>
Date: Wed, 18 Nov 2015 10:48:55 -0800
Subject: [PATCH] arm64: restore bogomips information in /proc/cpuinfo

As previously reported, some userspace applications depend on bogomips showed by /proc/cpuinfo. Although there is much less legacy impact on aarch64 than arm, it does break libvirt.

This patch reverts commit 326b16db9f69 ("arm64: delay: don't bother reporting bogomips in /proc/cpuinfo"), but with some tweak due to context change and without the pr_info().

Fixes 326b16db9f69 ("arm64: delay: don't bother reporting bogomips in /proc/cpuinfo")
Cc <[email protected]> # 3.12+
arch/arm64/kernel/cpuinfo.c +5 -0
index 706679d0a0b4..212ae6361d8b 100644
@@ -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)