percpu: add @align to pcpu_fc_alloc_fn_t

pcpu_fc_alloc_fn_t is about to see more interesting usage, add @align
parameter.
Signed-off-by: Tejun Heo <tj@kernel.org>

arch/x86/kernel/setup_percpu.c

@@ -126,9 +126,9 @@ static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
 /*
  * Helpers for first chunk memory allocation
  */
-static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size)
+static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
 {
-	return pcpu_alloc_bootmem(cpu, size, size);
+	return pcpu_alloc_bootmem(cpu, size, align);
 }
 
 static void __init pcpu_fc_free(void *ptr, size_t size)

include/linux/percpu.h

@@ -71,7 +71,8 @@ extern const char *pcpu_fc_names[PCPU_FC_NR];
 
 extern enum pcpu_fc pcpu_chosen_fc;
 
-typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size);
+typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
+				     size_t align);
 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);

mm/percpu.c

@@ -1578,7 +1578,7 @@ ssize_t __init pcpu_page_first_chunk(size_t reserved_size,
 		for (i = 0; i < unit_pages; i++) {
 			void *ptr;
 
-			ptr = alloc_fn(cpu, PAGE_SIZE);
+			ptr = alloc_fn(cpu, PAGE_SIZE, PAGE_SIZE);
 			if (!ptr) {
 				pr_warning("PERCPU: failed to allocate %s page "
 					   "for cpu%u\n", psize_str, cpu);
@@ -1888,7 +1888,7 @@ ssize_t __init pcpu_lpage_first_chunk(size_t reserved_size, size_t dyn_size,
 				goto found;
 		continue;
 	found:
-		ptr = alloc_fn(cpu, lpage_size);
+		ptr = alloc_fn(cpu, lpage_size, lpage_size);
 		if (!ptr) {
 			pr_warning("PERCPU: failed to allocate large page "
 				   "for cpu%u\n", cpu);