Commit f1829286 authored Jun 12, 2014 by Stepan Moskovchenko

arm64: show present cpu instead of online cpu in /proc/cpuinfo



Some userspace applications use /proc/cpuinfo to determine how many CPUs
the system has. CPU hotplug can offline a CPU at runtime and causing the
offline CPU not present in /proc/cpuinfo if we only show online cpu in
/proc/cpuinfo. Show all present CPUs in /proc/cpuinfo so that userspace
can take advantage of all availabie CPUs, even though some CPUs may have
been brought offline due to inactivity.

Change-Id: I6afe11e406c4a6ac0dd04d6abac11c2b68b9685a
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>

parent 512fe370

arch/arm64/kernel/setup.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -404,7 +404,7 @@ static int c_show(struct seq_file m, void v)
		seq_printf(m, "Processor\t: %s rev %d (%s)\n",
		cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);

		for_each_online_cpu(i) {
		for_each_present_cpu(i) {
		/*
		* glibc reads /proc/cpuinfo to determine the number of
		* online processors, looking for lines beginning with