x86: merge setup_per_cpu_maps() into setup_per_cpu_areas()

Impact: minor optimization

Eliminates the need for two loops over possible cpus.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 19 insertions, 29 deletions

diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 90b8e154bb53..d0b1476490a7 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -97,33 +97,6 @@ static inline void setup_cpu_local_masks(void)
 #endif /* CONFIG_X86_32 */
 
 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
-/*
- * Copy data used in early init routines from the initial arrays to the
- * per cpu data areas.  These arrays then become expendable and the
- * *_early_ptr's are zeroed indicating that the static arrays are gone.
- */
-static void __init setup_per_cpu_maps(void)
-{
-        int cpu;
-
-        for_each_possible_cpu(cpu) {
-                per_cpu(x86_cpu_to_apicid, cpu) =
-                                early_per_cpu_map(x86_cpu_to_apicid, cpu);
-                per_cpu(x86_bios_cpu_apicid, cpu) =
-                                early_per_cpu_map(x86_bios_cpu_apicid, cpu);
-#ifdef X86_64_NUMA
-                per_cpu(x86_cpu_to_node_map, cpu) =
-                                early_per_cpu_map(x86_cpu_to_node_map, cpu);
-#endif
-        }
-
-        /* indicate the early static arrays will soon be gone */
-        early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
-        early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
-#ifdef X86_64_NUMA
-        early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
-#endif
-}
 
 #ifdef CONFIG_X86_64
 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
@@ -181,6 +154,19 @@ void __init setup_per_cpu_areas(void)
                 per_cpu_offset(cpu) = ptr - __per_cpu_start;
                 per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
                 per_cpu(cpu_number, cpu) = cpu;
+                /*
+                 * Copy data used in early init routines from the initial arrays to the
+                 * per cpu data areas.  These arrays then become expendable and the
+                 * *_early_ptr's are zeroed indicating that the static arrays are gone.
+                 */
+                per_cpu(x86_cpu_to_apicid, cpu) =
+                                early_per_cpu_map(x86_cpu_to_apicid, cpu);
+                per_cpu(x86_bios_cpu_apicid, cpu) =
+                                early_per_cpu_map(x86_bios_cpu_apicid, cpu);
+#ifdef X86_64_NUMA
+                per_cpu(x86_cpu_to_node_map, cpu) =
+                                early_per_cpu_map(x86_cpu_to_node_map, cpu);
+#endif
 #ifdef CONFIG_X86_64
                 per_cpu(irq_stack_ptr, cpu) =
                         per_cpu(irq_stack_union.irq_stack, cpu) + IRQ_STACK_SIZE - 64;
@@ -195,8 +181,12 @@ void __init setup_per_cpu_areas(void)
                 DBG("PERCPU: cpu %4d %p\n", cpu, ptr);
         }
 
-        /* Setup percpu data maps */
-        setup_per_cpu_maps();
+        /* indicate the early static arrays will soon be gone */
+        early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
+        early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
+#ifdef X86_64_NUMA
+        early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
+#endif
 
         /* Setup node to cpumask map */
         setup_node_to_cpumask_map();