x86: use cpumask_var_t in acpi/boot.c

Impact: reduce stack size, use new API.

Replace cpumask_t with cpumask_var_t.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 7 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index fd24c55e4ae2..29dc0c89d4af 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -538,9 +538,10 @@ static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
         union acpi_object *obj;
         struct acpi_madt_local_apic *lapic;
-        cpumask_t tmp_map, new_map;
+        cpumask_var_t tmp_map, new_map;
         u8 physid;
         int cpu;
+        int retval = -ENOMEM;
 
         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
                 return -EINVAL;
@@ -569,23 +570,37 @@ static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
         buffer.length = ACPI_ALLOCATE_BUFFER;
         buffer.pointer = NULL;
 
-        tmp_map = cpu_present_map;
+        if (!alloc_cpumask_var(&tmp_map, GFP_KERNEL))
+                goto out;
+
+        if (!alloc_cpumask_var(&new_map, GFP_KERNEL))
+                goto free_tmp_map;
+
+        cpumask_copy(tmp_map, cpu_present_mask);
         acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
 
         /*
          * If mp_register_lapic successfully generates a new logical cpu
          * number, then the following will get us exactly what was mapped
          */
-        cpus_andnot(new_map, cpu_present_map, tmp_map);
-        if (cpus_empty(new_map)) {
+        cpumask_andnot(new_map, cpu_present_mask, tmp_map);
+        if (cpumask_empty(new_map)) {
                 printk ("Unable to map lapic to logical cpu number\n");
-                return -EINVAL;
+                retval = -EINVAL;
+                goto free_new_map;
         }
 
-        cpu = first_cpu(new_map);
+        cpu = cpumask_first(new_map);
 
         *pcpu = cpu;
-        return 0;
+        retval = 0;
+
+free_new_map:
+        free_cpumask_var(new_map);
+free_tmp_map:
+        free_cpumask_var(tmp_map);
+out:
+        return retval;
 }
 
 /* wrapper to silence section mismatch warning */