linux-kernel - [PATCH 3.12 52/64] arm64: restore bogomips information in /proc/cpuinfo

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Message-Id: <aa2a63cb7dd04b392f3bdf9381d6cf124bc796c7.1455198893.git.jslaby@suse.cz>
Date:	Thu, 11 Feb 2016 14:59:28 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Yang Shi <yang.shi@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 52/64] arm64: restore bogomips information in /proc/cpuinfo

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

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

===============

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>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 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 24bf1563c3bd..59411c933393 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -365,6 +365,10 @@ 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)
-- 
2.7.1