diff options
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/mmio-mod.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/arch/x86/mm/mmio-mod.c b/arch/x86/mm/mmio-mod.c index 2c4baa88f2c..c9342ed8b40 100644 --- a/arch/x86/mm/mmio-mod.c +++ b/arch/x86/mm/mmio-mod.c @@ -378,27 +378,34 @@ static void clear_trace_list(void) } #ifdef CONFIG_HOTPLUG_CPU -static cpumask_t downed_cpus; +static cpumask_var_t downed_cpus; static void enter_uniprocessor(void) { int cpu; int err; + if (downed_cpus == NULL && + !alloc_cpumask_var(&downed_cpus, GFP_KERNEL)) { + pr_notice(NAME "Failed to allocate mask\n"); + goto out; + } + get_online_cpus(); - downed_cpus = cpu_online_map; - cpu_clear(first_cpu(cpu_online_map), downed_cpus); + cpumask_copy(downed_cpus, cpu_online_mask); + cpumask_clear_cpu(cpumask_first(cpu_online_mask), downed_cpus); if (num_online_cpus() > 1) pr_notice(NAME "Disabling non-boot CPUs...\n"); put_online_cpus(); - for_each_cpu_mask(cpu, downed_cpus) { + for_each_cpu(cpu, downed_cpus) { err = cpu_down(cpu); if (!err) pr_info(NAME "CPU%d is down.\n", cpu); else pr_err(NAME "Error taking CPU%d down: %d\n", cpu, err); } +out: if (num_online_cpus() > 1) pr_warning(NAME "multiple CPUs still online, " "may miss events.\n"); @@ -411,10 +418,10 @@ static void __ref leave_uniprocessor(void) int cpu; int err; - if (cpus_weight(downed_cpus) == 0) + if (downed_cpus == NULL || cpumask_weight(downed_cpus) == 0) return; pr_notice(NAME "Re-enabling CPUs...\n"); - for_each_cpu_mask(cpu, downed_cpus) { + for_each_cpu(cpu, downed_cpus) { err = cpu_up(cpu); if (!err) pr_info(NAME "enabled CPU%d.\n", cpu); |