diff options
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 5b4440d57f89..d484f2869861 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -8,6 +8,7 @@ #include <linux/init.h> #include <linux/notifier.h> #include <linux/sched.h> +#include <linux/sched/smt.h> #include <linux/unistd.h> #include <linux/cpu.h> #include <linux/oom.h> @@ -206,6 +207,12 @@ void cpu_hotplug_enable(void) EXPORT_SYMBOL_GPL(cpu_hotplug_enable); #endif /* CONFIG_HOTPLUG_CPU */ +/* + * Architectures that need SMT-specific errata handling during SMT hotplug + * should override this. + */ +void __weak arch_smt_update(void) { } + /* Need to know about CPUs going up/down? */ int register_cpu_notifier(struct notifier_block *nb) { @@ -445,6 +452,7 @@ out_release: trace_sched_cpu_hotplug(cpu, err, 0); if (!err) cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu); + arch_smt_update(); return err; } @@ -549,7 +557,7 @@ out_notify: out: cpu_hotplug_done(); trace_sched_cpu_hotplug(cpu, ret, 1); - + arch_smt_update(); return ret; } @@ -911,6 +919,19 @@ void init_cpu_isolated(const struct cpumask *src) cpumask_copy(to_cpumask(cpu_isolated_bits), src); } +enum cpu_mitigations cpu_mitigations = CPU_MITIGATIONS_AUTO; + +static int __init mitigations_parse_cmdline(char *arg) +{ + if (!strcmp(arg, "off")) + cpu_mitigations = CPU_MITIGATIONS_OFF; + else if (!strcmp(arg, "auto")) + cpu_mitigations = CPU_MITIGATIONS_AUTO; + + return 0; +} +early_param("mitigations", mitigations_parse_cmdline); + static ATOMIC_NOTIFIER_HEAD(idle_notifier); void idle_notifier_register(struct notifier_block *n) |