Merge branch 'master' into upstream

20 files changed, 276 insertions, 43 deletions

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 8290b69da20..213c7850d5f 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -453,7 +453,7 @@ config ALPHA_IRONGATE
 
 config GENERIC_HWEIGHT
 	bool
-	default y if !ALPHA_EV6 && !ALPHA_EV67
+	default y if !ALPHA_EV67
 
 config ALPHA_AVANTI
 	bool
diff --git a/arch/arm/mach-ep93xx/ts72xx.c b/arch/arm/mach-ep93xx/ts72xx.c
index 9be01b0c3f4..e24566b88a7 100644
--- a/arch/arm/mach-ep93xx/ts72xx.c
+++ b/arch/arm/mach-ep93xx/ts72xx.c
@@ -111,21 +111,21 @@ static void __init ts72xx_map_io(void)
 	}
 }
 
-static unsigned char ts72xx_rtc_readb(unsigned long addr)
+static unsigned char ts72xx_rtc_readbyte(unsigned long addr)
 {
 	__raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
 	return __raw_readb(TS72XX_RTC_DATA_VIRT_BASE);
 }
 
-static void ts72xx_rtc_writeb(unsigned char value, unsigned long addr)
+static void ts72xx_rtc_writebyte(unsigned char value, unsigned long addr)
 {
 	__raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
 	__raw_writeb(value, TS72XX_RTC_DATA_VIRT_BASE);
 }
 
 static struct m48t86_ops ts72xx_rtc_ops = {
-	.readb			= ts72xx_rtc_readb,
-	.writeb			= ts72xx_rtc_writeb,
+	.readbyte		= ts72xx_rtc_readbyte,
+	.writebyte		= ts72xx_rtc_writebyte,
 };
 
 static struct platform_device ts72xx_rtc_device = {
diff --git a/arch/arm/mach-imx/irq.c b/arch/arm/mach-imx/irq.c
index eeb8a6d4a39..a5de5f1da9f 100644
--- a/arch/arm/mach-imx/irq.c
+++ b/arch/arm/mach-imx/irq.c
@@ -127,7 +127,7 @@ static void
 imx_gpio_ack_irq(unsigned int irq)
 {
 	DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, irq);
-	ISR(IRQ_TO_REG(irq)) |= 1 << ((irq - IRQ_GPIOA(0)) % 32);
+	ISR(IRQ_TO_REG(irq)) = 1 << ((irq - IRQ_GPIOA(0)) % 32);
 }
 
 static void
diff --git a/arch/arm/mach-integrator/integrator_cp.c b/arch/arm/mach-integrator/integrator_cp.c
index a0724f2b24c..9f55f5ae104 100644
--- a/arch/arm/mach-integrator/integrator_cp.c
+++ b/arch/arm/mach-integrator/integrator_cp.c
@@ -232,8 +232,6 @@ static void __init intcp_init_irq(void)
 	for (i = IRQ_PIC_START; i <= IRQ_PIC_END; i++) {
 		if (i == 11)
 			i = 22;
-		if (i == IRQ_CP_CPPLDINT)
-			i++;
 		if (i == 29)
 			break;
 		set_irq_chip(i, &pic_chip);
@@ -259,8 +257,7 @@ static void __init intcp_init_irq(void)
 		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 	}
 
-	set_irq_handler(IRQ_CP_CPPLDINT, sic_handle_irq);
-	pic_unmask_irq(IRQ_CP_CPPLDINT);
+	set_irq_chained_handler(IRQ_CP_CPPLDINT, sic_handle_irq);
 }
 
 /*
diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index 19b372df544..44bcb8097c7 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -371,6 +371,7 @@ static int spitz_ohci_init(struct device *dev)
 static struct pxaohci_platform_data spitz_ohci_platform_data = {
 	.port_mode	= PMM_NPS_MODE,
 	.init		= spitz_ohci_init,
+	.power_budget	= 150,
 };
 
 
diff --git a/arch/arm/mach-sa1100/neponset.c b/arch/arm/mach-sa1100/neponset.c
index 9e02bc3712a..af6d2775cf8 100644
--- a/arch/arm/mach-sa1100/neponset.c
+++ b/arch/arm/mach-sa1100/neponset.c
@@ -59,6 +59,14 @@ neponset_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *reg
 		if (irr & (IRR_ETHERNET | IRR_USAR)) {
 			desc->chip->mask(irq);
 
+			/*
+			 * Ack the interrupt now to prevent re-entering
+			 * this neponset handler.  Again, this is safe
+			 * since we'll check the IRR register prior to
+			 * leaving.
+			 */
+			desc->chip->ack(irq);
+
 			if (irr & IRR_ETHERNET) {
 				d = irq_desc + IRQ_NEPONSET_SMC9196;
 				desc_handle_irq(IRQ_NEPONSET_SMC9196, d, regs);
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index 799697d32de..cebd48a3dae 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -112,10 +112,9 @@ void __init versatile_init_irq(void)
 {
 	unsigned int i;
 
-	vic_init(VA_VIC_BASE, IRQ_VIC_START, ~(1 << 31));
+	vic_init(VA_VIC_BASE, IRQ_VIC_START, ~0);
 
-	set_irq_handler(IRQ_VICSOURCE31, sic_handle_irq);
-	enable_irq(IRQ_VICSOURCE31);
+	set_irq_chained_handler(IRQ_VICSOURCE31, sic_handle_irq);
 
 	/* Do second interrupt controller */
 	writel(~0, VA_SIC_BASE + SIC_IRQ_ENABLE_CLEAR);
diff --git a/arch/i386/kernel/acpi/earlyquirk.c b/arch/i386/kernel/acpi/earlyquirk.c
index 2e3b643a4dc..1649a175a20 100644
--- a/arch/i386/kernel/acpi/earlyquirk.c
+++ b/arch/i386/kernel/acpi/earlyquirk.c
@@ -5,17 +5,34 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
+#include <linux/acpi.h>
+
 #include <asm/pci-direct.h>
 #include <asm/acpi.h>
 #include <asm/apic.h>
 
+#ifdef CONFIG_ACPI
+
+static int nvidia_hpet_detected __initdata;
+
+static int __init nvidia_hpet_check(unsigned long phys, unsigned long size)
+{
+	nvidia_hpet_detected = 1;
+	return 0;
+}
+#endif
+
 static int __init check_bridge(int vendor, int device)
 {
 #ifdef CONFIG_ACPI
-	/* According to Nvidia all timer overrides are bogus. Just ignore
-	   them all. */
+	/* According to Nvidia all timer overrides are bogus unless HPET
+	   is enabled. */
 	if (vendor == PCI_VENDOR_ID_NVIDIA) {
-		acpi_skip_timer_override = 1;
+		nvidia_hpet_detected = 0;
+		acpi_table_parse(ACPI_HPET, nvidia_hpet_check);
+		if (nvidia_hpet_detected == 0) {
+			acpi_skip_timer_override = 1;
+		}
 	}
 #endif
 	if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) {
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 846e1639ef7..dd6b0e3386c 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1547,15 +1547,18 @@ void __init setup_arch(char **cmdline_p)
 	if (efi_enabled)
 		efi_map_memmap();
 
-#ifdef CONFIG_X86_IO_APIC
-	check_acpi_pci();	/* Checks more than just ACPI actually */
-#endif
-
 #ifdef CONFIG_ACPI
 	/*
 	 * Parse the ACPI tables for possible boot-time SMP configuration.
 	 */
 	acpi_boot_table_init();
+#endif
+
+#ifdef CONFIG_X86_IO_APIC
+	check_acpi_pci();	/* Checks more than just ACPI actually */
+#endif
+
+#ifdef CONFIG_ACPI
 	acpi_boot_init();
 
 #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 41e9ab40cd5..f70bd090dac 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -822,6 +822,7 @@ static void __init prom_send_capabilities(void)
 		/* try calling the ibm,client-architecture-support method */
 		if (call_prom_ret("call-method", 3, 2, &ret,
 				  ADDR("ibm,client-architecture-support"),
+				  root,
 				  ADDR(ibm_architecture_vec)) == 0) {
 			/* the call exists... */
 			if (ret)
@@ -1622,6 +1623,15 @@ static int __init prom_find_machine_type(void)
 			if (strstr(p, RELOC("Power Macintosh")) ||
 			    strstr(p, RELOC("MacRISC")))
 				return PLATFORM_POWERMAC;
+#ifdef CONFIG_PPC64
+			/* We must make sure we don't detect the IBM Cell
+			 * blades as pSeries due to some firmware issues,
+			 * so we do it here.
+			 */
+			if (strstr(p, RELOC("IBM,CBEA")) ||
+			    strstr(p, RELOC("IBM,CPBW-1.0")))
+				return PLATFORM_GENERIC;
+#endif /* CONFIG_PPC64 */
 			i += sl + 1;
 		}
 	}
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 01e3c08cb55..8fdeca2d459 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -803,10 +803,13 @@ static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int
 		if (__get_user(cmcp, &ucp->uc_regs))
 			return -EFAULT;
 		mcp = (struct mcontext __user *)(u64)cmcp;
+		/* no need to check access_ok(mcp), since mcp < 4GB */
 	}
 #else
 	if (__get_user(mcp, &ucp->uc_regs))
 		return -EFAULT;
+	if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
+		return -EFAULT;
 #endif
 	restore_sigmask(&set);
 	if (restore_user_regs(regs, mcp, sig))
@@ -908,13 +911,14 @@ int sys_debug_setcontext(struct ucontext __user *ctx,
 {
 	struct sig_dbg_op op;
 	int i;
+	unsigned char tmp;
 	unsigned long new_msr = regs->msr;
 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
 	unsigned long new_dbcr0 = current->thread.dbcr0;
 #endif
 
 	for (i=0; i<ndbg; i++) {
-		if (__copy_from_user(&op, dbg, sizeof(op)))
+		if (copy_from_user(&op, dbg + i, sizeof(op)))
 			return -EFAULT;
 		switch (op.dbg_type) {
 		case SIG_DBG_SINGLE_STEPPING:
@@ -959,6 +963,11 @@ int sys_debug_setcontext(struct ucontext __user *ctx,
 	current->thread.dbcr0 = new_dbcr0;
 #endif
 
+	if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
+	    || __get_user(tmp, (u8 __user *) ctx)
+	    || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
+		return -EFAULT;
+
 	/*
 	 * If we get a fault copying the context into the kernel's
 	 * image of the user's registers, we can't just return -EFAULT
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 27f65b95184..c2db642f4cd 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -182,6 +182,8 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
 	err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
 	if (err)
 		return err;
+	if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
+		return -EFAULT;
 	/* Copy 33 vec registers (vr0..31 and vscr) from the stack */
 	if (v_regs != 0 && (msr & MSR_VEC) != 0)
 		err |= __copy_from_user(current->thread.vr, v_regs,
diff --git a/arch/powerpc/platforms/cell/setup.c b/arch/powerpc/platforms/cell/setup.c
index 6574b22b3cf..fd3e5609e3e 100644
--- a/arch/powerpc/platforms/cell/setup.c
+++ b/arch/powerpc/platforms/cell/setup.c
@@ -125,14 +125,13 @@ static void __init cell_init_early(void)
 
 static int __init cell_probe(void)
 {
-	/* XXX This is temporary, the Cell maintainer will come up with
-	 * more appropriate detection logic
-	 */
 	unsigned long root = of_get_flat_dt_root();
-	if (!of_flat_dt_is_compatible(root, "IBM,CPBW-1.0"))
-		return 0;
 
-	return 1;
+	if (of_flat_dt_is_compatible(root, "IBM,CBEA") ||
+	    of_flat_dt_is_compatible(root, "IBM,CPBW-1.0"))
+		return 1;
+
+	return 0;
 }
 
 /*
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 5f79f01c44f..3ba87835757 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -389,6 +389,7 @@ static int __init pSeries_probe_hypertas(unsigned long node,
 
 static int __init pSeries_probe(void)
 {
+	unsigned long root = of_get_flat_dt_root();
  	char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
  					  "device_type", NULL);
  	if (dtype == NULL)
@@ -396,6 +397,13 @@ static int __init pSeries_probe(void)
  	if (strcmp(dtype, "chrp"))
 		return 0;
 
+	/* Cell blades firmware claims to be chrp while it's not. Until this
+	 * is fixed, we need to avoid those here.
+	 */
+	if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
+	    of_flat_dt_is_compatible(root, "IBM,CBEA"))
+		return 0;
+
 	DBG("pSeries detected, looking for LPAR capability...\n");
 
 	/* Now try to figure out if we are running on LPAR */
diff --git a/arch/sparc/kernel/smp.c b/arch/sparc/kernel/smp.c
index a93f5da6855..40b42c88e6a 100644
--- a/arch/sparc/kernel/smp.c
+++ b/arch/sparc/kernel/smp.c
@@ -69,6 +69,17 @@ void __init smp_store_cpu_info(int id)
 						     "clock-frequency", 0);
 	cpu_data(id).prom_node = cpu_node;
 	cpu_data(id).mid = cpu_get_hwmid(cpu_node);
+
+	/* this is required to tune the scheduler correctly */
+	/* is it possible to have CPUs with different cache sizes? */
+	if (id == boot_cpu_id) {
+		int cache_line,cache_nlines;
+		cache_line = 0x20;
+		cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line);
+		cache_nlines = 0x8000;
+		cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines);
+		max_cache_size = cache_line * cache_nlines;
+	}
 	if (cpu_data(id).mid < 0)
 		panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
 }
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 2b7a1f316a9..0c089520297 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -599,18 +599,128 @@ struct pci_iommu_ops pci_sun4v_iommu_ops = {
 
 /* SUN4V PCI configuration space accessors. */
 
-static inline int pci_sun4v_out_of_range(struct pci_pbm_info *pbm, unsigned int bus, unsigned int device, unsigned int func)
+struct pdev_entry {
+	struct pdev_entry	*next;
+	u32			devhandle;
+	unsigned int		bus;
+	unsigned int		device;
+	unsigned int		func;
+};
+
+#define PDEV_HTAB_SIZE	16
+#define PDEV_HTAB_MASK	(PDEV_HTAB_SIZE - 1)
+static struct pdev_entry *pdev_htab[PDEV_HTAB_SIZE];
+
+static inline unsigned int pdev_hashfn(u32 devhandle, unsigned int bus, unsigned int device, unsigned int func)
 {
-	if (bus == pbm->pci_first_busno) {
-		if (device == 0 && func == 0)
-			return 0;
-		return 1;
+	unsigned int val;
+
+	val = (devhandle ^ (devhandle >> 4));
+	val ^= bus;
+	val ^= device;
+	val ^= func;
+
+	return val & PDEV_HTAB_MASK;
+}
+
+static int pdev_htab_add(u32 devhandle, unsigned int bus, unsigned int device, unsigned int func)
+{
+	struct pdev_entry *p = kmalloc(sizeof(*p), GFP_KERNEL);
+	struct pdev_entry **slot;
+
+	if (!p)
+		return -ENOMEM;
+
+	slot = &pdev_htab[pdev_hashfn(devhandle, bus, device, func)];
+	p->next = *slot;
+	*slot = p;
+
+	p->devhandle = devhandle;
+	p->bus = bus;
+	p->device = device;
+	p->func = func;
+
+	return 0;
+}
+
+/* Recursively descend into the OBP device tree, rooted at toplevel_node,
+ * looking for a PCI device matching bus and devfn.
+ */
+static int obp_find(struct linux_prom_pci_registers *pregs, int toplevel_node, unsigned int bus, unsigned int devfn)
+{
+	toplevel_node = prom_getchild(toplevel_node);
+
+	while (toplevel_node != 0) {
+		int ret = obp_find(pregs, toplevel_node, bus, devfn);
+
+		if (ret != 0)
+			return ret;
+
+		ret = prom_getproperty(toplevel_node, "reg", (char *) pregs,
+				       sizeof(*pregs) * PROMREG_MAX);
+		if (ret == 0 || ret == -1)
+			goto next_sibling;
+
+		if (((pregs[0].phys_hi >> 16) & 0xff) == bus &&
+		    ((pregs[0].phys_hi >> 8) & 0xff) == devfn)
+			break;
+
+	next_sibling:
+		toplevel_node = prom_getsibling(toplevel_node);
+	}
+
+	return toplevel_node;
+}
+
+static int pdev_htab_populate(struct pci_pbm_info *pbm)
+{
+	struct linux_prom_pci_registers pr[PROMREG_MAX];
+	u32 devhandle = pbm->devhandle;
+	unsigned int bus;
+
+	for (bus = pbm->pci_first_busno; bus <= pbm->pci_last_busno; bus++) {
+		unsigned int devfn;
+
+		for (devfn = 0; devfn < 256; devfn++) {
+			unsigned int device = PCI_SLOT(devfn);
+			unsigned int func = PCI_FUNC(devfn);
+
+			if (obp_find(pr, pbm->prom_node, bus, devfn)) {
+				int err = pdev_htab_add(devhandle, bus,
+							device, func);
+				if (err)
+					return err;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static struct pdev_entry *pdev_find(u32 devhandle, unsigned int bus, unsigned int device, unsigned int func)
+{
+	struct pdev_entry *p;
+
+	p = pdev_htab[pdev_hashfn(devhandle, bus, device, func)];
+	while (p) {
+		if (p->devhandle == devhandle &&
+		    p->bus == bus &&
+		    p->device == device &&
+		    p->func == func)
+			break;
+
+		p = p->next;
 	}
 
+	return p;
+}
+
+static inline int pci_sun4v_out_of_range(struct pci_pbm_info *pbm, unsigned int bus, unsigned int device, unsigned int func)
+{
 	if (bus < pbm->pci_first_busno ||
 	    bus > pbm->pci_last_busno)
 		return 1;
-	return 0;
+	return pdev_find(pbm->devhandle, bus, device, func) == NULL;
 }
 
 static int pci_sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
@@ -1063,6 +1173,8 @@ static void pci_sun4v_pbm_init(struct pci_controller_info *p, int prom_node, u32
 
 	pci_sun4v_get_bus_range(pbm);
 	pci_sun4v_iommu_init(pbm);
+
+	pdev_htab_populate(pbm);
 }
 
 void sun4v_pci_init(int node, char *model_name)
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 4e8cd79156e..f03d52d0b88 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -1287,6 +1287,40 @@ int setup_profiling_timer(unsigned int multiplier)
 	return 0;
 }
 
+static void __init smp_tune_scheduling(void)
+{
+	int instance, node;
+	unsigned int def, smallest = ~0U;
+
+	def = ((tlb_type == hypervisor) ?
+	       (3 * 1024 * 1024) :
+	       (4 * 1024 * 1024));
+
+	instance = 0;
+	while (!cpu_find_by_instance(instance, &node, NULL)) {
+		unsigned int val;
+
+		val = prom_getintdefault(node, "ecache-size", def);
+		if (val < smallest)
+			smallest = val;
+
+		instance++;
+	}
+
+	/* Any value less than 256K is nonsense.  */
+	if (smallest < (256U * 1024U))
+		smallest = 256 * 1024;
+
+	max_cache_size = smallest;
+
+	if (smallest < 1U * 1024U * 1024U)
+		printk(KERN_INFO "Using max_cache_size of %uKB\n",
+		       smallest / 1024U);
+	else
+		printk(KERN_INFO "Using max_cache_size of %uMB\n",
+		       smallest / 1024U / 1024U);
+}
+
 /* Constrain the number of cpus to max_cpus.  */
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
@@ -1322,6 +1356,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 	}
 
 	smp_store_cpu_info(boot_cpu_id);
+	smp_tune_scheduling();
 }
 
 /* Set this up early so that things like the scheduler can init
diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c
index 62d8a99271e..38e569f786d 100644
--- a/arch/sparc64/kernel/sparc64_ksyms.c
+++ b/arch/sparc64/kernel/sparc64_ksyms.c
@@ -297,7 +297,6 @@ EXPORT_SYMBOL(svr4_getcontext);
 EXPORT_SYMBOL(svr4_setcontext);
 EXPORT_SYMBOL(compat_sys_ioctl);
 EXPORT_SYMBOL(sparc32_open);
-EXPORT_SYMBOL(sys_close);
 #endif
 
 /* Special internal versions of library functions. */
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 2793a5d8238..563db528e03 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -1797,7 +1797,9 @@ static const char *sun4v_err_type_to_str(u32 type)
 	};
 }
 
-static void sun4v_log_error(struct sun4v_error_entry *ent, int cpu, const char *pfx, atomic_t *ocnt)
+extern void __show_regs(struct pt_regs * regs);
+
+static void sun4v_log_error(struct pt_regs *regs, struct sun4v_error_entry *ent, int cpu, const char *pfx, atomic_t *ocnt)
 {
 	int cnt;
 
@@ -1830,6 +1832,8 @@ static void sun4v_log_error(struct sun4v_error_entry *ent, int cpu, const char *
 	       pfx,
 	       ent->err_raddr, ent->err_size, ent->err_cpu);
 
+	__show_regs(regs);
+
 	if ((cnt = atomic_read(ocnt)) != 0) {
 		atomic_set(ocnt, 0);
 		wmb();
@@ -1862,7 +1866,7 @@ void sun4v_resum_error(struct pt_regs *regs, unsigned long offset)
 
 	put_cpu();
 
-	sun4v_log_error(&local_copy, cpu,
+	sun4v_log_error(regs, &local_copy, cpu,
 			KERN_ERR "RESUMABLE ERROR",
 			&sun4v_resum_oflow_cnt);
 }
@@ -1910,7 +1914,7 @@ void sun4v_nonresum_error(struct pt_regs *regs, unsigned long offset)
 	}
 #endif
 
-	sun4v_log_error(&local_copy, cpu,
+	sun4v_log_error(regs, &local_copy, cpu,
 			KERN_EMERG "NON-RESUMABLE ERROR",
 			&sun4v_nonresum_oflow_cnt);
 
@@ -2200,7 +2204,6 @@ static inline struct reg_window *kernel_stack_up(struct reg_window *rw)
 void die_if_kernel(char *str, struct pt_regs *regs)
 {
 	static int die_counter;
-	extern void __show_regs(struct pt_regs * regs);
 	extern void smp_report_regs(void);
 	int count = 0;
 	
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 0de3ea93883..9cc7031b715 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -271,6 +271,18 @@ __setup("enable_8254_timer", setup_enable_8254_timer);
 #include <linux/pci_ids.h>
 #include <linux/pci.h>
 
+
+#ifdef CONFIG_ACPI
+
+static int nvidia_hpet_detected __initdata;
+
+static int __init nvidia_hpet_check(unsigned long phys, unsigned long size)
+{
+	nvidia_hpet_detected = 1;
+	return 0;
+}
+#endif
+
 /* Temporary Hack. Nvidia and VIA boards currently only work with IO-APIC
    off. Check for an Nvidia or VIA PCI bridge and turn it off.
    Use pci direct infrastructure because this runs before the PCI subsystem. 
@@ -317,11 +329,19 @@ void __init check_ioapic(void)
 					return;
 				case PCI_VENDOR_ID_NVIDIA:
 #ifdef CONFIG_ACPI
-					/* All timer overrides on Nvidia
-				           seem to be wrong. Skip them. */
-					acpi_skip_timer_override = 1;
-					printk(KERN_INFO 
-	     "Nvidia board detected. Ignoring ACPI timer override.\n");
+					/*
+					 * All timer overrides on Nvidia are
+					 * wrong unless HPET is enabled.
+					 */
+					nvidia_hpet_detected = 0;
+					acpi_table_parse(ACPI_HPET,
+							nvidia_hpet_check);
+					if (nvidia_hpet_detected == 0) {
+						acpi_skip_timer_override = 1;
+						printk(KERN_INFO "Nvidia board "
+						    "detected. Ignoring ACPI "
+						    "timer override.\n");
+					}
 #endif
 					/* RED-PEN skip them on mptables too? */
 					return;