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bot+bpf-ci@kernel.org writes: >> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig >> index fe60738e5943..fa676428ec3f 100644 >> --- a/arch/arm64/Kconfig >> +++ b/arch/arm64/Kconfig >> @@ -1606,6 +1606,9 @@ config ARCH_SUPPORTS_CRASH_DUMP >> config ARCH_DEFAULT_CRASH_DUMP >> def_bool y >> >> +config ARCH_HAS_CPU_RELAX >> + def_bool y >> + > > ARCH_HAS_CPU_RELAX isn't private to the barrier code. Before this it was > defined only by arch/x86, and the generic kernel already keys cpuidle > behavior off it in two places that arm64 builds. > > In drivers/cpuidle/Makefile: > > obj-$(CONFIG_ARCH_HAS_CPU_RELAX) += poll_state.o > > and in drivers/acpi/processor_idle.c: > > #define ACPI_IDLE_STATE_START (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX) ? 1 : 0) > ... > if (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX)) { > cpuidle_poll_state_init(drv); > count = 1; > } > > On arm64, ACPI_PROCESSOR is "default y" and depends on ARM64, and it > selects ACPI_PROCESSOR_IDLE which selects CPU_IDLE. So on an ACPI arm64 > system this now builds poll_state.o and makes acpi_processor_setup_cstates() > register a POLL idle state as C-state index 0, shifting the firmware > C-states up by one. Yes, this is a bug. The additional POLL idle state change wasn't intended to be registered as part of this patch. With this change the first c-state will end up executing a NOP poll_idle() since current_set_polling_and_test() is tif_need_resched() when TIF_POLLING_NRFLAG is not defined but this does unnecessarily register the additional c-state. I missed that in my testing because my test machine has LPI states which need an explicit change to enable this. (https://lore.kernel.org/lkml/20250218213337.377987-7-ankur.a.arora@oracle.com/) Ankur > The commit message describes this symbol only as indicating "an optimized > implementation of cpu_poll_relax()", and the generic patch describes it as > "a cpu_poll_relax() implementation that is expected to be cheaper". Neither > mentions the cpuidle/ACPI poll_state side effect. > > > Is enabling the cpuidle polling idle state on arm64 intended here, or is > ARCH_HAS_CPU_RELAX only meant to feed smp_cond_load_relaxed_timeout()? If > the latter, would a dedicated symbol (or decoupling poll_state/ACPI from > ARCH_HAS_CPU_RELAX) avoid the unintended idle-path change? > > --- > AI reviewed your patch. Please fix the bug or email reply why it's not a bug. > See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md > > CI run summary: https://github.com/kernel-patches/bpf/actions/runs/27125050324 -- ankur