-git8, 9: NULL pointer dereference in

diff -puN arch/x86_64/kernel/apic.c~revert-insert-ioapics-and-local-apic-into-resource-map arch/x86_64/kernel/apic.c
@@ -25,7 +25,6 @@
 #include <linux/kernel_stat.h>
 #include <linux/sysdev.h>
 #include <linux/module.h>
-#include <linux/ioport.h>
 
 #include <asm/atomic.h>
 #include <asm/smp.h>

@@ -46,11 +45,6 @@ int apic_calibrate_pmtmr __initdata;
 
 int disable_apic_timer __initdata;
 
-static struct resource lapic_resource = {
-	.name = "Local APIC",
-	.flags = IORESOURCE_MEM | IORESOURCE_BUSY,
-};
-
 /*
  * cpu_mask that denotes the CPUs that needs timer interrupt coming in as
  * IPIs in place of local APIC timers

@@ -591,40 +585,6 @@ static int __init detect_init_APIC (void
 	return 0;
 }
 
-#ifdef CONFIG_X86_IO_APIC
-static struct resource * __init ioapic_setup_resources(void)
-{
-#define IOAPIC_RESOURCE_NAME_SIZE 11
-	unsigned long n;
-	struct resource *res;
-	char *mem;
-	int i;
-
-	if (nr_ioapics <= 0)
-		return NULL;
-
-	n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
-	n *= nr_ioapics;
-
-	res = alloc_bootmem(n);
-
-	if (!res)
-		return NULL;
-
-	memset(res, 0, n);
-	mem = (void *)&res[nr_ioapics];
-
-	for (i = 0; i < nr_ioapics; i++) {
-		res[i].name = mem;
-		res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
-		snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
-		mem += IOAPIC_RESOURCE_NAME_SIZE;
-	}
-
-	return res;
-}
-#endif
-
 void __init init_apic_mappings(void)
 {
 	unsigned long apic_phys;

@@ -644,11 +604,6 @@ void __init init_apic_mappings(void)
 	apic_mapped = 1;
 	apic_printk(APIC_VERBOSE,"mapped APIC to %16lx (%16lx)\n", APIC_BASE, apic_phys);
 
-	/* Put local APIC into the resource map. */
-	lapic_resource.start = apic_phys;
-	lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
-	insert_resource(&iomem_resource, &lapic_resource);
-
 	/*
 	 * Fetch the APIC ID of the BSP in case we have a
 	 * default configuration (or the MP table is broken).

@@ -658,9 +613,7 @@ void __init init_apic_mappings(void)
 	{
 		unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
 		int i;
-		struct resource *ioapic_res;
 
-		ioapic_res = ioapic_setup_resources();
 		for (i = 0; i < nr_ioapics; i++) {
 			if (smp_found_config) {
 				ioapic_phys = mp_ioapics[i].mpc_apicaddr;

@@ -672,13 +625,6 @@ void __init init_apic_mappings(void)
 			apic_printk(APIC_VERBOSE,"mapped IOAPIC to %016lx (%016lx)\n",
 					__fix_to_virt(idx), ioapic_phys);
 			idx++;
-
-			if (ioapic_res) {
-				ioapic_res->start = ioapic_phys;
-				ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
-				insert_resource(&iomem_resource, ioapic_res);
-				ioapic_res++;
-			}
 		}
 	}
 }