Merge "arm64: fix bug for reloading FPSIMD state after CPU hotplug." (1f068969) · Commits · e / devices / android_kernel_xiaomi_markw

arch/arm64/kernel/fpsimd.c

+31 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,7 @@
		* along with this program. If not, see <http://www.gnu.org/licenses/>.
		*/

		#include <linux/cpu.h>
		#include <linux/cpu_pm.h>
		#include <linux/kernel.h>
		#include <linux/init.h>
		@@ -296,6 +297,35 @@ static void fpsimd_pm_init(void)
		static inline void fpsimd_pm_init(void) { }
		#endif /* CONFIG_CPU_PM */

		#ifdef CONFIG_HOTPLUG_CPU
		static int fpsimd_cpu_hotplug_notifier(struct notifier_block *nfb,
		unsigned long action,
		void *hcpu)
		{
		unsigned int cpu = (long)hcpu;

		switch (action) {
		case CPU_DEAD:
		case CPU_DEAD_FROZEN:
		per_cpu(fpsimd_last_state, cpu) = NULL;
		break;
		}
		return NOTIFY_OK;
		}

		static struct notifier_block fpsimd_cpu_hotplug_notifier_block = {
		.notifier_call = fpsimd_cpu_hotplug_notifier,
		};

		static inline void fpsimd_hotplug_init(void)
		{
		register_cpu_notifier(&fpsimd_cpu_hotplug_notifier_block);
		}

		#else
		static inline void fpsimd_hotplug_init(void) { }
		#endif

		/*
		* FP/SIMD support code initialisation.
		*/
		@@ -315,6 +345,7 @@ static int __init fpsimd_init(void)
		elf_hwcap \|= HWCAP_ASIMD;

		fpsimd_pm_init();
		fpsimd_hotplug_init();

		return 0;
		}