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Commit d09ce834 authored by Sudeep Holla's avatar Sudeep Holla Committed by Will Deacon
Browse files

arm64: perf: replace arch_find_n_match_cpu_physical_id with of_cpu_device_node_get 



arch_find_n_match_cpu_physical_id parses the device tree to get the
device node for a given logical cpu index. However, since ARM PMUs get
probed after the CPU device nodes are stashed while registering the
cpus, we can use of_cpu_device_node_get to avoid another DT parse.

This patch replaces arch_find_n_match_cpu_physical_id with
of_cpu_device_node_get to reuse the stashed value directly instead.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 2d23ed04

arch/arm64/kernel/perf_event.c

+2 −2
Original line number Diff line number Diff line
@@ -25,7 +25,7 @@ 
#include <linux/irq.h>

#include <linux/kernel.h>

#include <linux/export.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/perf_event.h>

#include <linux/platform_device.h>

#include <linux/slab.h>
@@ -1335,7 +1335,7 @@ static int armpmu_device_probe(struct platform_device *pdev) 
		}



		for_each_possible_cpu(cpu)

			if (arch_find_n_match_cpu_physical_id(dn, cpu, NULL))

			if (dn == of_cpu_device_node_get(cpu))

				break;



		if (cpu >= nr_cpu_ids) {