Merge HEAD from oss.sgi.com:/oss/git/linux-2.6.git

21 files changed, 149 insertions, 113 deletions

diff --git a/arch/i386/boot/Makefile b/arch/i386/boot/Makefile
index 0fea75dd4e3..f136752563b 100644
--- a/arch/i386/boot/Makefile
+++ b/arch/i386/boot/Makefile
@@ -101,4 +101,4 @@ zlilo: $(BOOTIMAGE)
 	if [ -x /sbin/lilo ]; then /sbin/lilo; else /etc/lilo/install; fi
 
 install:
-	sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $< System.map "$(INSTALL_PATH)"
+	sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $(BOOTIMAGE) System.map "$(INSTALL_PATH)"
diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c
index e8a53552b13..d0cadb33b54 100644
--- a/arch/i386/mm/pageattr.c
+++ b/arch/i386/mm/pageattr.c
@@ -224,7 +224,7 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
 		return;
 	if (!enable)
 		mutex_debug_check_no_locks_freed(page_address(page),
-						 page_address(page+numpages));
+						 numpages * PAGE_SIZE);
 
 	/* the return value is ignored - the calls cannot fail,
 	 * large pages are disabled at boot time.
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index a065349aee3..d8a4ca021aa 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -29,9 +29,9 @@
 #include <asm/processor.h>
 #include <asm/sections.h>
 
-int split_tlb;
-int dcache_stride;
-int icache_stride;
+int split_tlb __read_mostly;
+int dcache_stride __read_mostly;
+int icache_stride __read_mostly;
 EXPORT_SYMBOL(dcache_stride);
 
 
@@ -45,29 +45,29 @@ DEFINE_SPINLOCK(pa_tlb_lock);
 EXPORT_SYMBOL(pa_tlb_lock);
 #endif
 
-struct pdc_cache_info cache_info;
+struct pdc_cache_info cache_info __read_mostly;
 #ifndef CONFIG_PA20
-static struct pdc_btlb_info btlb_info;
+static struct pdc_btlb_info btlb_info __read_mostly;
 #endif
 
 #ifdef CONFIG_SMP
 void
 flush_data_cache(void)
 {
-	on_each_cpu((void (*)(void *))flush_data_cache_local, NULL, 1, 1);
+	on_each_cpu(flush_data_cache_local, NULL, 1, 1);
 }
 void 
 flush_instruction_cache(void)
 {
-	on_each_cpu((void (*)(void *))flush_instruction_cache_local, NULL, 1, 1);
+	on_each_cpu(flush_instruction_cache_local, NULL, 1, 1);
 }
 #endif
 
 void
 flush_cache_all_local(void)
 {
-	flush_instruction_cache_local();
-	flush_data_cache_local();
+	flush_instruction_cache_local(NULL);
+	flush_data_cache_local(NULL);
 }
 EXPORT_SYMBOL(flush_cache_all_local);
 
@@ -332,7 +332,7 @@ void clear_user_page_asm(void *page, unsigned long vaddr)
 }
 
 #define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
-int parisc_cache_flush_threshold = FLUSH_THRESHOLD;
+int parisc_cache_flush_threshold __read_mostly = FLUSH_THRESHOLD;
 
 void parisc_setup_cache_timing(void)
 {
diff --git a/arch/parisc/kernel/drivers.c b/arch/parisc/kernel/drivers.c
index d016d672ec2..1eaa0d37f67 100644
--- a/arch/parisc/kernel/drivers.c
+++ b/arch/parisc/kernel/drivers.c
@@ -39,7 +39,7 @@
 #include <asm/parisc-device.h>
 
 /* See comments in include/asm-parisc/pci.h */
-struct hppa_dma_ops *hppa_dma_ops;
+struct hppa_dma_ops *hppa_dma_ops __read_mostly;
 EXPORT_SYMBOL(hppa_dma_ops);
 
 static struct device root = {
@@ -515,8 +515,13 @@ alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
 			(iodc_data[5] << 8) | iodc_data[6];
 	dev->hpa.name = parisc_pathname(dev);
 	dev->hpa.start = hpa;
-	if (hpa == 0xf4000000 || hpa == 0xf6000000 ||
-	    hpa == 0xf8000000 || hpa == 0xfa000000) {
+	/* This is awkward.  The STI spec says that gfx devices may occupy
+	 * 32MB or 64MB.  Unfortunately, we don't know how to tell whether
+	 * it's the former or the latter.  Assumptions either way can hurt us.
+	 */
+	if (hpa == 0xf4000000 || hpa == 0xf8000000) {
+		dev->hpa.end = hpa + 0x03ffffff;
+	} else if (hpa == 0xf6000000 || hpa == 0xfa000000) {
 		dev->hpa.end = hpa + 0x01ffffff;
 	} else {
 		dev->hpa.end = hpa + 0xfff;
@@ -834,7 +839,7 @@ static void print_parisc_device(struct parisc_device *dev)
 
 	if (dev->num_addrs) {
 		int k;
-		printk(",  additional addresses: ");
+		printk(", additional addresses: ");
 		for (k = 0; k < dev->num_addrs; k++)
 			printk("0x%lx ", dev->addr[k]);
 	}
diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c
index 553f8fe0322..2dc06b8e181 100644
--- a/arch/parisc/kernel/firmware.c
+++ b/arch/parisc/kernel/firmware.c
@@ -80,7 +80,7 @@ static unsigned long pdc_result2[32] __attribute__ ((aligned (8)));
 
 /* Firmware needs to be initially set to narrow to determine the 
  * actual firmware width. */
-int parisc_narrow_firmware = 1;
+int parisc_narrow_firmware __read_mostly = 1;
 #endif
 
 /* On most currently-supported platforms, IODC I/O calls are 32-bit calls
diff --git a/arch/parisc/kernel/hardware.c b/arch/parisc/kernel/hardware.c
index 2071b5bba15..3058bffd8a2 100644
--- a/arch/parisc/kernel/hardware.c
+++ b/arch/parisc/kernel/hardware.c
@@ -551,6 +551,7 @@ static struct hp_hardware hp_hardware_list[] __initdata = {
 	{HPHW_BCPORT, 0x804, 0x0000C, 0x10, "REO I/O BC Merced Port"}, 
 	{HPHW_BCPORT, 0x782, 0x0000C, 0x00, "REO I/O BC Ropes Port"}, 
 	{HPHW_BCPORT, 0x784, 0x0000C, 0x00, "Pluto I/O BC Ropes Port"}, 
+	{HPHW_BRIDGE, 0x05D, 0x0000A, 0x00, "SummitHawk Dino PCI Bridge"}, 
 	{HPHW_BRIDGE, 0x680, 0x0000A, 0x00, "Dino PCI Bridge"}, 
 	{HPHW_BRIDGE, 0x682, 0x0000A, 0x00, "Cujo PCI Bridge"}, 
 	{HPHW_BRIDGE, 0x782, 0x0000A, 0x00, "Elroy PCI Bridge"}, 
diff --git a/arch/parisc/kernel/inventory.c b/arch/parisc/kernel/inventory.c
index 8f563871e83..4e847ba5318 100644
--- a/arch/parisc/kernel/inventory.c
+++ b/arch/parisc/kernel/inventory.c
@@ -38,7 +38,7 @@
 */
 #undef DEBUG_PAT
 
-int pdc_type = PDC_TYPE_ILLEGAL;
+int pdc_type __read_mostly = PDC_TYPE_ILLEGAL;
 
 void __init setup_pdc(void)
 {
@@ -120,8 +120,8 @@ set_pmem_entry(physmem_range_t *pmem_ptr, unsigned long start,
 	 * pdc info is bad in this case).
 	 */
 
-	if (   ((start & (PAGE_SIZE - 1)) != 0)
-	    || ((pages4k & ((1UL << PDC_PAGE_ADJ_SHIFT) - 1)) != 0) ) {
+	if (unlikely( ((start & (PAGE_SIZE - 1)) != 0)
+	    || ((pages4k & ((1UL << PDC_PAGE_ADJ_SHIFT) - 1)) != 0) )) {
 
 		panic("Memory range doesn't align with page size!\n");
 	}
diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
index f94a02ef3d9..a6caf107308 100644
--- a/arch/parisc/kernel/pci-dma.c
+++ b/arch/parisc/kernel/pci-dma.c
@@ -33,10 +33,10 @@
 #include <asm/uaccess.h>
 #include <asm/tlbflush.h>	/* for purge_tlb_*() macros */
 
-static struct proc_dir_entry * proc_gsc_root = NULL;
+static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
 static int pcxl_proc_info(char *buffer, char **start, off_t offset, int length);
-static unsigned long pcxl_used_bytes = 0;
-static unsigned long pcxl_used_pages = 0;
+static unsigned long pcxl_used_bytes __read_mostly = 0;
+static unsigned long pcxl_used_pages __read_mostly = 0;
 
 extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
 static spinlock_t   pcxl_res_lock;
diff --git a/arch/parisc/kernel/pdc_chassis.c b/arch/parisc/kernel/pdc_chassis.c
index 52004ae28d2..2a01fe1bdc9 100644
--- a/arch/parisc/kernel/pdc_chassis.c
+++ b/arch/parisc/kernel/pdc_chassis.c
@@ -30,6 +30,7 @@
 #include <linux/kernel.h>
 #include <linux/reboot.h>
 #include <linux/notifier.h>
+#include <linux/cache.h>
 
 #include <asm/pdc_chassis.h>
 #include <asm/processor.h>
@@ -38,8 +39,8 @@
 
 
 #ifdef CONFIG_PDC_CHASSIS
-static int pdc_chassis_old = 0;	
-static unsigned int pdc_chassis_enabled = 1;
+static int pdc_chassis_old __read_mostly = 0;	
+static unsigned int pdc_chassis_enabled __read_mostly = 1;
 
 
 /**
@@ -132,7 +133,7 @@ void __init parisc_pdc_chassis_init(void)
 {
 #ifdef CONFIG_PDC_CHASSIS
 	int handle = 0;
-	if (pdc_chassis_enabled) {
+	if (likely(pdc_chassis_enabled)) {
 		DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);
 
 		/* Let see if we have something to handle... */
@@ -142,7 +143,7 @@ void __init parisc_pdc_chassis_init(void)
 			printk(KERN_INFO "Enabling PDC_PAT chassis codes support.\n");
 			handle = 1;
 		}
-		else if (pdc_chassis_old) {
+		else if (unlikely(pdc_chassis_old)) {
 			printk(KERN_INFO "Enabling old style chassis LED panel support.\n");
 			handle = 1;
 		}
@@ -178,7 +179,7 @@ int pdc_chassis_send_status(int message)
 	/* Maybe we should do that in an other way ? */
 	int retval = 0;
 #ifdef CONFIG_PDC_CHASSIS
-	if (pdc_chassis_enabled) {
+	if (likely(pdc_chassis_enabled)) {
 
 		DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);
 
@@ -214,7 +215,7 @@ int pdc_chassis_send_status(int message)
 			}
 		} else retval = -1;
 #else
-		if (pdc_chassis_old) {
+		if (unlikely(pdc_chassis_old)) {
 			switch (message) {
 				case PDC_CHASSIS_DIRECT_BSTART:
 				case PDC_CHASSIS_DIRECT_BCOMPLETE:
diff --git a/arch/parisc/kernel/perf.c b/arch/parisc/kernel/perf.c
index f6fec62b6a2..79dcbcccecb 100644
--- a/arch/parisc/kernel/perf.c
+++ b/arch/parisc/kernel/perf.c
@@ -66,10 +66,10 @@ struct rdr_tbl_ent {
 	uint8_t		write_control;
 };
 
-static int perf_processor_interface = UNKNOWN_INTF;
-static int perf_enabled = 0;
+static int perf_processor_interface __read_mostly = UNKNOWN_INTF;
+static int perf_enabled __read_mostly = 0;
 static spinlock_t perf_lock;
-struct parisc_device *cpu_device = NULL;
+struct parisc_device *cpu_device __read_mostly = NULL;
 
 /* RDRs to write for PCX-W */
 static int perf_rdrs_W[] = 
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index fee4f1f09ad..4eb70a40ec7 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -54,7 +54,7 @@
 #include <asm/uaccess.h>
 #include <asm/unwind.h>
 
-static int hlt_counter;
+static int hlt_counter __read_mostly;
 
 /*
  * Power off function, if any
diff --git a/arch/parisc/kernel/processor.c b/arch/parisc/kernel/processor.c
index 4f5bbcf1f5a..6df9f62cecb 100644
--- a/arch/parisc/kernel/processor.c
+++ b/arch/parisc/kernel/processor.c
@@ -44,10 +44,10 @@
 #include <asm/irq.h>		/* for struct irq_region */
 #include <asm/parisc-device.h>
 
-struct system_cpuinfo_parisc boot_cpu_data;
+struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
 EXPORT_SYMBOL(boot_cpu_data);
 
-struct cpuinfo_parisc cpu_data[NR_CPUS];
+struct cpuinfo_parisc cpu_data[NR_CPUS] __read_mostly;
 
 /*
 **  	PARISC CPU driver - claim "device" and initialize CPU data structures.
@@ -378,12 +378,12 @@ show_cpuinfo (struct seq_file *m, void *v)
 	return 0;
 }
 
-static struct parisc_device_id processor_tbl[] = {
+static struct parisc_device_id processor_tbl[] __read_mostly = {
 	{ HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
 	{ 0, }
 };
 
-static struct parisc_driver cpu_driver = {
+static struct parisc_driver cpu_driver __read_mostly = {
 	.name		= "CPU",
 	.id_table	= processor_tbl,
 	.probe		= processor_probe
diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c
index 73e9c34b094..4a36ec3f6ac 100644
--- a/arch/parisc/kernel/setup.c
+++ b/arch/parisc/kernel/setup.c
@@ -46,15 +46,15 @@
 #include <asm/io.h>
 #include <asm/setup.h>
 
-char	command_line[COMMAND_LINE_SIZE];
+char	command_line[COMMAND_LINE_SIZE] __read_mostly;
 
 /* Intended for ccio/sba/cpu statistics under /proc/bus/{runway|gsc} */
-struct proc_dir_entry * proc_runway_root = NULL;
-struct proc_dir_entry * proc_gsc_root = NULL;
-struct proc_dir_entry * proc_mckinley_root = NULL;
+struct proc_dir_entry * proc_runway_root __read_mostly = NULL;
+struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
+struct proc_dir_entry * proc_mckinley_root __read_mostly = NULL;
 
 #if !defined(CONFIG_PA20) && (defined(CONFIG_IOMMU_CCIO) || defined(CONFIG_IOMMU_SBA))
-int parisc_bus_is_phys = 1;	/* Assume no IOMMU is present */
+int parisc_bus_is_phys __read_mostly = 1;	/* Assume no IOMMU is present */
 EXPORT_SYMBOL(parisc_bus_is_phys);
 #endif
 
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index ce89da0f654..17f23c26f1c 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -39,7 +39,7 @@
 #include <asm/atomic.h>
 #include <asm/current.h>
 #include <asm/delay.h>
-#include <asm/pgalloc.h>	/* for flush_tlb_all() proto/macro */
+#include <asm/tlbflush.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>		/* for CPU_IRQ_REGION and friends */
@@ -58,9 +58,9 @@ DEFINE_SPINLOCK(smp_lock);
 
 volatile struct task_struct *smp_init_current_idle_task;
 
-static volatile int cpu_now_booting = 0;	/* track which CPU is booting */
+static volatile int cpu_now_booting __read_mostly = 0;	/* track which CPU is booting */
 
-static int parisc_max_cpus = 1;
+static int parisc_max_cpus __read_mostly = 1;
 
 /* online cpus are ones that we've managed to bring up completely
  * possible cpus are all valid cpu 
@@ -71,8 +71,8 @@ static int parisc_max_cpus = 1;
  * empty in the beginning.
  */
 
-cpumask_t cpu_online_map = CPU_MASK_NONE;	/* Bitmap of online CPUs */
-cpumask_t cpu_possible_map = CPU_MASK_ALL;	/* Bitmap of Present CPUs */
+cpumask_t cpu_online_map   __read_mostly = CPU_MASK_NONE;	/* Bitmap of online CPUs */
+cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL;	/* Bitmap of Present CPUs */
 
 EXPORT_SYMBOL(cpu_online_map);
 EXPORT_SYMBOL(cpu_possible_map);
@@ -406,12 +406,10 @@ EXPORT_SYMBOL(smp_call_function);
  * as we want to ensure all TLB's flushed before proceeding.
  */
 
-extern void flush_tlb_all_local(void);
-
 void
 smp_flush_tlb_all(void)
 {
-	on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1);
+	on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
 }
 
 
@@ -487,7 +485,7 @@ void __init smp_callin(void)
 #endif
 
 	flush_cache_all_local(); /* start with known state */
-	flush_tlb_all_local();
+	flush_tlb_all_local(NULL);
 
 	local_irq_enable();  /* Interrupts have been off until now */
 
diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index cded2568078..594930bc4bc 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -36,8 +36,8 @@
 /* xtime and wall_jiffies keep wall-clock time */
 extern unsigned long wall_jiffies;
 
-static long clocktick;	/* timer cycles per tick */
-static long halftick;
+static long clocktick __read_mostly;	/* timer cycles per tick */
+static long halftick __read_mostly;
 
 #ifdef CONFIG_SMP
 extern void smp_do_timer(struct pt_regs *regs);
diff --git a/arch/parisc/kernel/topology.c b/arch/parisc/kernel/topology.c
index ac2a4068141..3ba040050e4 100644
--- a/arch/parisc/kernel/topology.c
+++ b/arch/parisc/kernel/topology.c
@@ -20,8 +20,9 @@
 #include <linux/init.h>
 #include <linux/smp.h>
 #include <linux/cpu.h>
+#include <linux/cache.h>
 
-static struct cpu cpu_devices[NR_CPUS];
+static struct cpu cpu_devices[NR_CPUS] __read_mostly;
 
 static int __init topology_init(void)
 {
diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
index eaae8a021f9..de0a1b21cb4 100644
--- a/arch/parisc/kernel/unaligned.c
+++ b/arch/parisc/kernel/unaligned.c
@@ -122,7 +122,7 @@
 #define ERR_NOTHANDLED	-1
 #define ERR_PAGEFAULT	-2
 
-int unaligned_enabled = 1;
+int unaligned_enabled __read_mostly = 1;
 
 void die_if_kernel (char *str, struct pt_regs *regs, long err);
 
diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index db141108412..cc1c1afc318 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -35,7 +35,7 @@ static spinlock_t unwind_lock;
  * we can call unwind_init as early in the bootup process as 
  * possible (before the slab allocator is initialized)
  */
-static struct unwind_table kernel_unwind_table;
+static struct unwind_table kernel_unwind_table __read_mostly;
 static LIST_HEAD(unwind_tables);
 
 static inline const struct unwind_table_entry *
diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
index e5fac3e08c7..6d6436a6b62 100644
--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -68,7 +68,7 @@ SECTIONS
   RODATA
 
   /* writeable */
-  . = ALIGN(4096);		/* Make sure this is paged aligned so
+  . = ALIGN(4096);		/* Make sure this is page aligned so
   				   that we can properly leave these
 				   as writable */
   data_start = .;
@@ -105,6 +105,10 @@ SECTIONS
   . = ALIGN(16);
   .data.lock_aligned : { *(.data.lock_aligned) }
 
+  /* rarely changed data like cpu maps */
+  . = ALIGN(16);
+  .data.read_mostly : { *(.data.read_mostly) }
+
   _edata = .;			/* End of data section */
 
   . = ALIGN(16384); 		/* init_task */
@@ -194,14 +198,7 @@ SECTIONS
 #endif
 	}
 
-  /* Stabs debugging sections.  */
-  .stab 0 : { *(.stab) }
-  .stabstr 0 : { *(.stabstr) }
-  .stab.excl 0 : { *(.stab.excl) }
-  .stab.exclstr 0 : { *(.stab.exclstr) }
-  .stab.index 0 : { *(.stab.index) }
-  .stab.indexstr 0 : { *(.stab.indexstr) }
-  .comment 0 : { *(.comment) }
+  STABS_DEBUG
   .note 0 : { *(.note) }	
 
 }
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 29b998e430e..720287d46e5 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -36,9 +36,9 @@ extern char _end;	/* end of BSS, defined by linker */
 extern char __init_begin, __init_end;
 
 #ifdef CONFIG_DISCONTIGMEM
-struct node_map_data node_data[MAX_NUMNODES];
-bootmem_data_t bmem_data[MAX_NUMNODES];
-unsigned char pfnnid_map[PFNNID_MAP_MAX];
+struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
+bootmem_data_t bmem_data[MAX_NUMNODES] __read_mostly;
+unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
 #endif
 
 static struct resource data_resource = {
@@ -58,14 +58,14 @@ static struct resource pdcdata_resource = {
 	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM,
 };
 
-static struct resource sysram_resources[MAX_PHYSMEM_RANGES];
+static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
 
 /* The following array is initialized from the firmware specific
  * information retrieved in kernel/inventory.c.
  */
 
-physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES];
-int npmem_ranges;
+physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
+int npmem_ranges __read_mostly;
 
 #ifdef __LP64__
 #define MAX_MEM         (~0UL)
@@ -73,7 +73,7 @@ int npmem_ranges;
 #define MAX_MEM         (3584U*1024U*1024U)
 #endif /* !__LP64__ */
 
-static unsigned long mem_limit = MAX_MEM;
+static unsigned long mem_limit __read_mostly = MAX_MEM;
 
 static void __init mem_limit_func(void)
 {
@@ -300,6 +300,13 @@ static void __init setup_bootmem(void)
 			max_pfn = start_pfn + npages;
 	}
 
+	/* IOMMU is always used to access "high mem" on those boxes
+	 * that can support enough mem that a PCI device couldn't
+	 * directly DMA to any physical addresses.
+	 * ISA DMA support will need to revisit this.
+	 */
+	max_low_pfn = max_pfn;
+
 	if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 		printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 		BUG();
@@ -431,11 +438,11 @@ void free_initmem(void)
 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 				     & ~(VM_MAP_OFFSET-1)))
 
-void *vmalloc_start;
+void *vmalloc_start __read_mostly;
 EXPORT_SYMBOL(vmalloc_start);
 
 #ifdef CONFIG_PA11
-unsigned long pcxl_dma_start;
+unsigned long pcxl_dma_start __read_mostly;
 #endif
 
 void __init mem_init(void)
@@ -475,7 +482,7 @@ int do_check_pgt_cache(int low, int high)
 	return 0;
 }
 
-unsigned long *empty_zero_page;
+unsigned long *empty_zero_page __read_mostly;
 
 void show_mem(void)
 {
@@ -998,7 +1005,7 @@ void flush_tlb_all(void)
 void flush_tlb_all(void)
 {
 	spin_lock(&sid_lock);
-	flush_tlb_all_local();
+	flush_tlb_all_local(NULL);
 	recycle_sids();
 	spin_unlock(&sid_lock);
 }
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
index 5c7a1b3b932..edd9a9559cb 100644
--- a/arch/parisc/mm/ioremap.c
+++ b/arch/parisc/mm/ioremap.c
@@ -1,12 +1,9 @@
 /*
  * arch/parisc/mm/ioremap.c
  *
- * Re-map IO memory to kernel address space so that we can access it.
- * This is needed for high PCI addresses that aren't mapped in the
- * 640k-1MB IO memory area on PC's
- *
  * (C) Copyright 1995 1996 Linus Torvalds
  * (C) Copyright 2001 Helge Deller <deller@gmx.de>
+ * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
  */
 
 #include <linux/vmalloc.h>
@@ -14,81 +11,107 @@
 #include <linux/module.h>
 #include <asm/io.h>
 #include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
 
-static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
-	unsigned long phys_addr, unsigned long flags)
+static inline void 
+remap_area_pte(pte_t *pte, unsigned long address, unsigned long size,
+	       unsigned long phys_addr, unsigned long flags)
 {
-	unsigned long end;
+	unsigned long end, pfn;
+	pgprot_t pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
+				   _PAGE_ACCESSED | flags);
 
 	address &= ~PMD_MASK;
+
 	end = address + size;
 	if (end > PMD_SIZE)
 		end = PMD_SIZE;
-	if (address >= end)
-		BUG();
+
+	BUG_ON(address >= end);
+
+	pfn = phys_addr >> PAGE_SHIFT;
 	do {
-		if (!pte_none(*pte)) {
-			printk(KERN_ERR "remap_area_pte: page already exists\n");
-			BUG();
-		}
-		set_pte(pte, mk_pte_phys(phys_addr, __pgprot(_PAGE_PRESENT | _PAGE_RW | 
-					_PAGE_DIRTY | _PAGE_ACCESSED | flags)));
+		BUG_ON(!pte_none(*pte));
+
+		set_pte(pte, pfn_pte(pfn, pgprot));
+
 		address += PAGE_SIZE;
-		phys_addr += PAGE_SIZE;
+		pfn++;
 		pte++;
 	} while (address && (address < end));
 }
 
-static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
-	unsigned long phys_addr, unsigned long flags)
+static inline int 
+remap_area_pmd(pmd_t *pmd, unsigned long address, unsigned long size,
+	       unsigned long phys_addr, unsigned long flags)
 {
 	unsigned long end;
 
 	address &= ~PGDIR_MASK;
+
 	end = address + size;
 	if (end > PGDIR_SIZE)
 		end = PGDIR_SIZE;
+
+	BUG_ON(address >= end);
+
 	phys_addr -= address;
-	if (address >= end)
-		BUG();
 	do {
-		pte_t * pte = pte_alloc_kernel(pmd, address);
+		pte_t *pte = pte_alloc_kernel(pmd, address);
 		if (!pte)
 			return -ENOMEM;
-		remap_area_pte(pte, address, end - address, address + phys_addr, flags);
+
+		remap_area_pte(pte, address, end - address, 
+			       address + phys_addr, flags);
+
 		address = (address + PMD_SIZE) & PMD_MASK;
 		pmd++;
 	} while (address && (address < end));
+
 	return 0;
 }
 
-#if (USE_HPPA_IOREMAP)
-static int remap_area_pages(unsigned long address, unsigned long phys_addr,
-				 unsigned long size, unsigned long flags)
+#if USE_HPPA_IOREMAP
+static int 
+remap_area_pages(unsigned long address, unsigned long phys_addr,
+		 unsigned long size, unsigned long flags)
 {
-	int error;
-	pgd_t * dir;
+	pgd_t *dir;
+	int error = 0;
 	unsigned long end = address + size;
 
+	BUG_ON(address >= end);
+
 	phys_addr -= address;
-	dir = pgd_offset(&init_mm, address);
+	dir = pgd_offset_k(address);
+
 	flush_cache_all();
-	if (address >= end)
-		BUG();
+
 	do {
+		pud_t *pud;
 		pmd_t *pmd;
-		pmd = pmd_alloc(&init_mm, dir, address);
+
 		error = -ENOMEM;
+		pud = pud_alloc(&init_mm, dir, address);
+		if (!pud)
+			break;
+
+		pmd = pmd_alloc(&init_mm, pud, address);
 		if (!pmd)
 			break;
+
 		if (remap_area_pmd(pmd, address, end - address,
-					 phys_addr + address, flags))
+				   phys_addr + address, flags))
 			break;
+
 		error = 0;
 		address = (address + PGDIR_SIZE) & PGDIR_MASK;
 		dir++;
 	} while (address && (address < end));
+
 	flush_tlb_all();
+
 	return error;
 }
 #endif /* USE_HPPA_IOREMAP */
@@ -123,8 +146,7 @@ EXPORT_SYMBOL(__raw_bad_addr);
 
 /*
  * Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
+ * address space.
  *
  * NOTE! We need to allow non-page-aligned mappings too: we will obviously
  * have to convert them into an offset in a page-aligned mapping, but the
@@ -148,8 +170,8 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 #endif
 
 #else
-	void * addr;
-	struct vm_struct * area;
+	void *addr;
+	struct vm_struct *area;
 	unsigned long offset, last_addr;
 
 	/* Don't allow wraparound or zero size */
@@ -167,9 +189,11 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 		t_addr = __va(phys_addr);
 		t_end = t_addr + (size - 1);
 	   
-		for(page = virt_to_page(t_addr); page <= virt_to_page(t_end); page++)
+		for (page = virt_to_page(t_addr); 
+		     page <= virt_to_page(t_end); page++) {
 			if(!PageReserved(page))
 				return NULL;
+		}
 	}
 
 	/*
@@ -185,11 +209,13 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 	area = get_vm_area(size, VM_IOREMAP);
 	if (!area)
 		return NULL;
+
 	addr = area->addr;
 	if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
 		vfree(addr);
 		return NULL;
 	}
+
 	return (void __iomem *) (offset + (char *)addr);
 #endif
 }