arm64 fix/update:

- Re-instate the CPUMASK_OFFSTACK option for arm64 when NR_CPUS > 256.
   The bug that led to the initial revert was the cpufreq-dt code not
   using zalloc_cpumask_var().
 
 - Make the STARFIVE_STARLINK_PMU config option depend on 64BIT to
   prevent compile-test failures on 32-bit architectures due to missing
   writeq().
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - Re-instate the CPUMASK_OFFSTACK option for arm64 when NR_CPUS > 256.
   The bug that led to the initial revert was the cpufreq-dt code not
   using zalloc_cpumask_var().

 - Make the STARFIVE_STARLINK_PMU config option depend on 64BIT to
   prevent compile-test failures on 32-bit architectures due to missing
   writeq().

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  perf: starfive: fix 64-bit only COMPILE_TEST condition
  ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512

arch/arm64/Kconfig

@@ -120,6 +120,7 @@ config ARM64
 	select CLONE_BACKWARDS
 	select COMMON_CLK
 	select CPU_PM if (SUSPEND || CPU_IDLE)
+	select CPUMASK_OFFSTACK if NR_CPUS > 256
 	select CRC32
 	select DCACHE_WORD_ACCESS
 	select DYNAMIC_FTRACE if FUNCTION_TRACER
@@ -1425,7 +1426,7 @@ config SCHED_SMT
 config NR_CPUS
 	int "Maximum number of CPUs (2-4096)"
 	range 2 4096
-	default "256"
+	default "512"
 
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"

drivers/perf/Kconfig

@@ -87,7 +87,8 @@ config RISCV_PMU_SBI
 	  filtering, counter configuration.
 
 config STARFIVE_STARLINK_PMU
-	depends on ARCH_STARFIVE || (COMPILE_TEST && 64BIT)
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	depends on 64BIT
 	bool "StarFive StarLink PMU"
 	help
 	   Provide support for StarLink Performance Monitor Unit.