Commit bdd41e69 authored Jun 03, 2015 by Stepan Moskovchenko Committed by Kyle Yan Jan 18, 2017

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>
[kyan: trivial merge conflict resolution and move changes
         in arch/arm64/kernel from setup.c to cpuinfo.c]
Signed-off-by: Kyle Yan <kyan@codeaurora.org>

parent 5b9b2988

arch/arm64/kernel/cpuinfo.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -112,7 +112,7 @@ static int c_show(struct seq_file m, void v)
		int i, j;
		bool compat = personality(current->personality) == PER_LINUX32;

		for_each_online_cpu(i) {
		for_each_present_cpu(i) {
		struct cpuinfo_arm64 *cpuinfo = &per_cpu(cpu_data, i);
		u32 midr = cpuinfo->reg_midr;