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ARM: pmu: remove unused reservation mechanism

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The PMU reservation mechanism was originally intended to allow OProfile
and perf-events to co-ordinate over access to the CPU PMU. Since then,
OProfile for ARM has moved to using perf as its backend, so the
reservation code is no longer used.

This patch removes the reservation code for the CPU PMU on ARM.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon
2012-07-28 16:27:03 +01:00
parent 50243efde0
commit f0d1bc4795
6 changed files with 1 additions and 87 deletions
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34
arch/arm/include/asm/pmu.h
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@@ -49,40 +49,6 @@ struct arm_pmu_platdata {
int (*runtime_suspend)(struct device *dev);
};
#ifdef CONFIG_CPU_HAS_PMU
/**
* reserve_pmu() - reserve the hardware performance counters
*
* Reserve the hardware performance counters in the system for exclusive use.
* Returns 0 on success or -EBUSY if the lock is already held.
*/
extern int
reserve_pmu(enum arm_pmu_type type);
/**
* release_pmu() - Relinquish control of the performance counters
*
* Release the performance counters and allow someone else to use them.
*/
extern void
release_pmu(enum arm_pmu_type type);
#else /* CONFIG_CPU_HAS_PMU */
#include <linux/err.h>
static inline int
reserve_pmu(enum arm_pmu_type type)
{
return -ENODEV;
}
static inline void
release_pmu(enum arm_pmu_type type) { }
#endif /* CONFIG_CPU_HAS_PMU */
#ifdef CONFIG_HW_PERF_EVENTS
/* The events for a given PMU register set. */