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Diffstat (limited to 'arch/arm64/kernel/topology.c')
| -rw-r--r-- | arch/arm64/kernel/topology.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index 7c9b6a0ecd6a..b8026ec684ba 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -343,9 +343,16 @@ static void cpu_read_constcnt(void *val) static inline int counters_read_on_cpu(int cpu, smp_call_func_t func, u64 *val) { + /* + * Abort call on counterless CPU or when interrupts are + * disabled - can lead to deadlock in smp sync call. + */ if (!cpu_has_amu_feat(cpu)) return -EOPNOTSUPP; + if (WARN_ON_ONCE(irqs_disabled())) + return -EPERM; + smp_call_function_single(cpu, func, val, 1); return 0; |