x86: split e820 reserved entries record to late v4

this one replaces:

| commit a2bd7274
| Author: Yinghai Lu <yhlu.kernel@gmail.com>
| Date:   Mon Aug 25 00:56:08 2008 -0700
|
|    x86: fix HPET regression in 2.6.26 versus 2.6.25, check hpet against BAR, v3

v2: insert e820 reserve resources before pnp_system_init
v3: fix merging problem in tip/x86/core
v4: address Linus's review about comments and condition in _late()
Signed-off-by: NYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/e820.c

@@ -1271,12 +1271,12 @@ static inline const char *e820_type_to_string(int e820_type)
 /*
  * Mark e820 reserved areas as busy for the resource manager.
  */
-struct resource __initdata *e820_res;
+static struct resource __initdata *e820_res;
 void __init e820_reserve_resources(void)
 {
 	int i;
-	u64 end;
 	struct resource *res;
+	u64 end;
 
 	res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
 	e820_res = res;
@@ -1293,6 +1293,12 @@ void __init e820_reserve_resources(void)
 		res->end = end;
 
 		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
+		/*
+		 * don't register the region that could be conflicted with
+		 * pci device BAR resource and insert them later in
+		 * pcibios_resource_survey()
+		 */
 		if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20))
 			insert_resource(&iomem_resource, res);
 		res++;
@@ -1313,7 +1319,7 @@ void __init e820_reserve_resources_late(void)
 
 	res = e820_res;
 	for (i = 0; i < e820.nr_map; i++) {
-		if (e820.map[i].type == E820_RESERVED && res->start >= (1ULL<<20))
+		if (!res->parent && res->end)
 			insert_resource(&iomem_resource, res);
 		res++;
 	}

arch/x86/pci/i386.c

@@ -31,11 +31,8 @@
 #include <linux/ioport.h>
 #include <linux/errno.h>
 #include <linux/bootmem.h>
-#include <linux/acpi.h>
 
 #include <asm/pat.h>
-#include <asm/hpet.h>
-#include <asm/io_apic.h>
 #include <asm/e820.h>
 
 #include "pci.h"
@@ -81,77 +78,6 @@ pcibios_align_resource(void *data, struct resource *res,
 }
 EXPORT_SYMBOL(pcibios_align_resource);
 
-static int check_res_with_valid(struct pci_dev *dev, struct resource *res)
-{
-	unsigned long base;
-	unsigned long size;
-	int i;
-
-	base = res->start;
-	size = (res->start == 0 && res->end == res->start) ? 0 :
-		 (res->end - res->start + 1);
-
-	if (!base || !size)
-		return 0;
-
-#ifdef CONFIG_HPET_TIMER
-	/* for hpet */
-	if (base == hpet_address && (res->flags & IORESOURCE_MEM)) {
-		dev_info(&dev->dev, "BAR has HPET at %08lx-%08lx\n",
-				 base, base + size - 1);
-		return 1;
-	}
-#endif
-
-#ifdef CONFIG_X86_IO_APIC
-	for (i = 0; i < nr_ioapics; i++) {
-		unsigned long ioapic_phys = mp_ioapics[i].mp_apicaddr;
-
-		if (base == ioapic_phys && (res->flags & IORESOURCE_MEM)) {
-			dev_info(&dev->dev, "BAR has ioapic at %08lx-%08lx\n",
-					 base, base + size - 1);
-			return 1;
-		}
-	}
-#endif
-
-#ifdef CONFIG_PCI_MMCONFIG
-	for (i = 0; i < pci_mmcfg_config_num; i++) {
-		unsigned long addr;
-
-		addr = pci_mmcfg_config[i].address;
-		if (base == addr && (res->flags & IORESOURCE_MEM)) {
-			dev_info(&dev->dev, "BAR has MMCONFIG at %08lx-%08lx\n",
-					 base, base + size - 1);
-			return 1;
-		}
-	}
-#endif
-
-	return 0;
-}
-
-static int check_platform(struct pci_dev *dev, struct resource *res)
-{
-	struct resource *root = NULL;
-
-	/*
-	 * forcibly insert it into the
-	 * resource tree
-	 */
-	if (res->flags & IORESOURCE_MEM)
-		root = &iomem_resource;
-	else if (res->flags & IORESOURCE_IO)
-		root = &ioport_resource;
-
-	if (root && check_res_with_valid(dev, res)) {
-		insert_resource(root, res);
-
-		return 1;
-	}
-
-	return 0;
-}
 /*
  *  Handle resources of PCI devices.  If the world were perfect, we could
  *  just allocate all the resource regions and do nothing more.  It isn't.
@@ -203,8 +129,6 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
 				pr = pci_find_parent_resource(dev, r);
 				if (!r->start || !pr ||
 				    request_resource(pr, r) < 0) {
-					if (check_platform(dev, r))
-						continue;
 					dev_err(&dev->dev, "BAR %d: can't allocate resource\n", idx);
 					/*
 					 * Something is wrong with the region.
@@ -246,8 +170,6 @@ static void __init pcibios_allocate_resources(int pass)
 					r->flags, disabled, pass);
 				pr = pci_find_parent_resource(dev, r);
 				if (!pr || request_resource(pr, r) < 0) {
-					if (check_platform(dev, r))
-						continue;
 					dev_err(&dev->dev, "BAR %d: can't allocate resource\n", idx);
 					/* We'll assign a new address later */
 					r->end -= r->start;
@@ -306,6 +228,8 @@ void __init pcibios_resource_survey(void)
 	pcibios_allocate_bus_resources(&pci_root_buses);
 	pcibios_allocate_resources(0);
 	pcibios_allocate_resources(1);
+
+	e820_reserve_resources_late();
 }
 
 /**