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[added,to,the,3.18,stable,tree] arm64: restore bogomips information in /proc/cpuinfo

Message ID 1455116401-27978-145-git-send-email-sasha.levin@oracle.com
State New
Headers show

Commit Message

Sasha Levin Feb. 10, 2016, 2:59 p.m. UTC 
From: Yang Shi <yang.shi@linaro.org>


This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.

-- 
2.5.0

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Patch

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

[ Upstream commit 92e788b749862ebe9920360513a718e5dd4da7a9 ]

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@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: <stable@vger.kernel.org> # 3.12+
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.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 d502a86..b5853ee 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -503,6 +503,10 @@  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)