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Fix an issue in the PSCI cpuidle driver introduced recently and a nasty x86 power regression introduced in 6.15: - Prevent freeing an uninitialized pointer in error path of dt_idle_state_present() in the PSCI cpuidle driver (Dan Carpenter). - Revert an x86 commit that went into 6.15 and caused idle power, including power in suspend-to-idle, to rise rather dramatically on systems booting with "nosmt" in the kernel command line (Rafael Wysocki). * pm-cpuidle: Revert "x86/smp: Eliminate mwait_play_dead_cpuid_hint()" cpuidle: psci: Fix uninitialized variable in dt_idle_state_present()