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armv8pmu_write_counter: sign-extend properly

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ihk_mc_event_set_period() calls armv8pmu_write_counter() by
cpu_pmu.write_counter(..., (uint64_t)(-left) & max_period)

Change-Id: I2ac8fbe5957db044ac54946f620163e3c486cb5f
This commit is contained in:
Masamichi Takagi
2020-06-12 11:44:02 +09:00
parent 6332903f0d
commit 1910543380
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/perfctr_armv8pmu.c
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@ -590,7 +590,7 @@ static inline void armv8pmu_write_counter(int idx, uint32_t value)
* count using the lower 32bits and we want an interrupt when * count using the lower 32bits and we want an interrupt when
* it overflows. * it overflows.
*/ */
uint64_t value64 = 0xffffffff00000000ULL | value; uint64_t value64 = (int32_t)value;
write_sysreg(value64, pmccntr_el0); write_sysreg(value64, pmccntr_el0);
} }