arm64: restore bogomips information in /proc/cpuinfo

Message ID 1453896867-19054-1-git-send-email-will.deacon@arm.com
State New
Headers show

Commit Message

Will Deacon Jan. 27, 2016, 12:14 p.m.
This is a backport of mainline commit 92e788b74986.

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: <stable@vger.kernel.org> # 4.3 and earlier
Signed-off-by: Will Deacon <will.deacon@arm.com>

---
 arch/arm64/kernel/setup.c | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.1.4

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Patch

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 232247945b1c..9f17dc72645a 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -558,6 +558,10 @@  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)