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ARM: 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: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Sudeep Holla 2015-06-30 13:56:57 +01:00 committed by Will Deacon
parent b6c084d7aa
commit bc1e3c4687
1 changed files with 2 additions and 2 deletions
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4
arch/arm/kernel/perf_event.c
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@ -15,7 +15,7 @@
#include <linux/cpumask.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@ -824,7 +824,7 @@ static int of_pmu_irq_cfg(struct arm_pmu *pmu)
/* Now look up the logical CPU number */
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) {