diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index d2ef0c2..86e80c5 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -447,8 +447,7 @@
 	"system standby resume",
 	"capabilities change"
 };
-#define NR_APM_EVENT_NAME	\
-		(sizeof(apm_event_name) / sizeof(apm_event_name[0]))
+#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
 
 typedef struct lookup_t {
 	int	key;
@@ -479,7 +478,7 @@
 	{ APM_NO_ERROR,		"BIOS did not set a return code" },
 	{ APM_NOT_PRESENT,	"No APM present" }
 };
-#define ERROR_COUNT	(sizeof(error_table)/sizeof(lookup_t))
+#define ERROR_COUNT	ARRAY_SIZE(error_table)
 
 /**
  *	apm_error	-	display an APM error
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
index 1465974..0ea010a 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
@@ -67,7 +67,7 @@
 	[CPU_MP4HT_D0]	= {15,  3, 4 },
 	[CPU_MP4HT_E0]	= {15,  4, 1 },
 };
-#define N_IDS	(sizeof(cpu_ids)/sizeof(cpu_ids[0]))
+#define N_IDS	ARRAY_SIZE(cpu_ids)
 
 struct cpu_model
 {
diff --git a/arch/i386/kernel/mca.c b/arch/i386/kernel/mca.c
index 8600fae..558bb20 100644
--- a/arch/i386/kernel/mca.c
+++ b/arch/i386/kernel/mca.c
@@ -132,7 +132,7 @@
 	{ .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
 };
 
-#define MCA_STANDARD_RESOURCES	(sizeof(mca_standard_resources)/sizeof(struct resource))
+#define MCA_STANDARD_RESOURCES	ARRAY_SIZE(mca_standard_resources)
 
 /**
  *	mca_read_and_store_pos - read the POS registers into a memory buffer
diff --git a/arch/i386/kernel/reboot_fixups.c b/arch/i386/kernel/reboot_fixups.c
index c9b8733..6f73c9e 100644
--- a/arch/i386/kernel/reboot_fixups.c
+++ b/arch/i386/kernel/reboot_fixups.c
@@ -42,7 +42,7 @@
 	struct pci_dev *dev;
 	int i;
 
-	for (i=0; i < (sizeof(fixups_table)/sizeof(fixups_table[0])); i++) {
+	for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
 		cur = &(fixups_table[i]);
 		dev = pci_get_device(cur->vendor, cur->device, NULL);
 		if (!dev)
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 01b618e..e6488ff 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -612,7 +612,7 @@
 
 	printk("Inquiring remote APIC #%d...\n", apicid);
 
-	for (i = 0; i < sizeof(regs) / sizeof(*regs); i++) {
+	for (i = 0; i < ARRAY_SIZE(regs); i++) {
 		printk("... APIC #%d %s: ", apicid, names[i]);
 
 		/*