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s390/cpum_cf: simplify hw_perf_event_destroy() 

To remove an event from the CPU Measurement counter facility
use the lock/unlock scheme as done in event creation. Remove
the atomic_add_unless function to make the code easier.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Thomas Richter 2023-01-24 12:20:50 +01:00 committed by Heiko Carstens
parent 7a725b7702
commit 1ce357cb82
1 changed files with 4 additions and 6 deletions
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10
arch/s390/kernel/perf_cpum_cf.c
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@ -397,12 +397,10 @@ static DEFINE_MUTEX(pmc_reserve_mutex);
/* Release the PMU if event is the last perf event */
static void hw_perf_event_destroy(struct perf_event *event)
{
if (!atomic_add_unless(&num_events, -1, 1)) {
mutex_lock(&pmc_reserve_mutex);
if (atomic_dec_return(&num_events) == 0)
__kernel_cpumcf_end();
mutex_unlock(&pmc_reserve_mutex);
}
mutex_lock(&pmc_reserve_mutex);
if (atomic_dec_return(&num_events) == 0)
__kernel_cpumcf_end();
mutex_unlock(&pmc_reserve_mutex);
}
/* CPUMF <-> perf event mappings for kernel+userspace (basic set) */