linux-kernel - [PATCH 3.16.y-ckt 020/126] arm64: restore bogomips information in /proc/cpuinfo

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Message-Id: <1452076655-12851-21-git-send-email-luis.henriques@canonical.com>
Date:	Wed,  6 Jan 2016 10:35:49 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Yang Shi <yang.shi@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 020/126] arm64: restore bogomips information in /proc/cpuinfo

3.16.7-ckt22 -stable review patch.  If anyone has any objections, please let me know.

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

From: Yang Shi <yang.shi@...aro.org>

commit 92e788b749862ebe9920360513a718e5dd4da7a9 upstream.

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")
Signed-off-by: Yang Shi <yang.shi@...aro.org>
Acked-by: Will Deacon <will.deacon@....com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
[ luis: backported to 3.16:
  - file rename: cpuinfo.c -> setup.c
  - linux/delay.h is already included
  - adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/arm64/kernel/setup.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 37655ae949b5..5da0da6e7cf0 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -502,6 +502,10 @@ static int c_show(struct seq_file *m, void *v)
 		seq_printf(m, "processor\t: %d\n", i);
 #endif
 
+		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)
--
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