diff options
Diffstat (limited to 'arch/arm64/kernel/fpsimd.c')
| -rw-r--r-- | arch/arm64/kernel/fpsimd.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index 3dca15634e69..44d6f7545505 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -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; } |