From 2764196f45be5efe1c9e71bf766ef6291ee86339 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sat, 11 Jun 2016 11:08:10 +0200 Subject: s390/perf: remove perf_release/reserver_sampling functions Now that the oprofile sampling code is gone there is only one user of the sampling facility left. Therefore the reserve and release functions can be removed. Signed-off-by: Heiko Carstens Reviewed-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/perf_cpum_sf.c | 5 ----- arch/s390/kernel/perf_event.c | 30 ------------------------------ 2 files changed, 35 deletions(-) (limited to 'arch/s390/kernel') diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index a8e832166417..9ea26dface38 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -601,17 +601,12 @@ static void release_pmc_hardware(void) irq_subclass_unregister(IRQ_SUBCLASS_MEASUREMENT_ALERT); on_each_cpu(setup_pmc_cpu, &flags, 1); - perf_release_sampling(); } static int reserve_pmc_hardware(void) { int flags = PMC_INIT; - int err; - err = perf_reserve_sampling(); - if (err) - return err; on_each_cpu(setup_pmc_cpu, &flags, 1); if (flags & PMC_FAILURE) { release_pmc_hardware(); diff --git a/arch/s390/kernel/perf_event.c b/arch/s390/kernel/perf_event.c index 87035fa58bbe..17431f63de00 100644 --- a/arch/s390/kernel/perf_event.c +++ b/arch/s390/kernel/perf_event.c @@ -248,33 +248,3 @@ ssize_t cpumf_events_sysfs_show(struct device *dev, return sprintf(page, "event=0x%04llx,name=%s\n", pmu_attr->id, attr->attr.name); } - -/* Reserve/release functions for sharing perf hardware */ -static DEFINE_SPINLOCK(perf_hw_owner_lock); -static void *perf_sampling_owner; - -int perf_reserve_sampling(void) -{ - int err; - - err = 0; - spin_lock(&perf_hw_owner_lock); - if (perf_sampling_owner) { - pr_warn("The sampling facility is already reserved by %p\n", - perf_sampling_owner); - err = -EBUSY; - } else - perf_sampling_owner = __builtin_return_address(0); - spin_unlock(&perf_hw_owner_lock); - return err; -} -EXPORT_SYMBOL(perf_reserve_sampling); - -void perf_release_sampling(void) -{ - spin_lock(&perf_hw_owner_lock); - WARN_ON(!perf_sampling_owner); - perf_sampling_owner = NULL; - spin_unlock(&perf_hw_owner_lock); -} -EXPORT_SYMBOL(perf_release_sampling); -- cgit v1.2.3-59-g8ed1b