Merge master.kernel.org:/pub/scm/linux/kernel/git/willy/parisc-2.6

* master.kernel.org:/pub/scm/linux/kernel/git/willy/parisc-2.6: (41 commits)
  [PARISC] Kill wall_jiffies use
  [PARISC] Honour "panic_on_oops" sysctl
  [PARISC] Fix fs/binfmt_som.c
  [PARISC] Export clear_user_page to modules
  [PARISC] Make DMA routines more stubby
  [PARISC] Define pci_get_legacy_ide_irq
  [PARISC] Fix CONFIG_DEBUG_SPINLOCK
  [PARISC] Fix HPUX compat compile with current GCC
  [PARISC] Fix iounmap compile warning
  [PARISC] Add support for Quicksilver AGPGART
  [PARISC] Move LBA and SBA register defines to the common ropes.h
  [PARISC] Create shared <asm/ropes.h> header
  [PARISC] Stash the lba_device in its struct device drvdata
  [PARISC] Generalize IS_ASTRO et al to take a parisc_device like
  [PARISC] Pretty print the name of the lba type on kernel boot
  [PARISC] Remove some obsolete comments and I checked that Reo is similar to Ike
  [PARISC] Add hardware found in the rp8400
  [PARISC] Allow nested interrupts
  [PARISC] Further updates to timer_interrupt()
  [PARISC] remove halftick and copy clocktick to local var (gcc can optimize usage)
  ...

16 files changed, 360 insertions, 200 deletions

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 6dd0ea8f88e0..d2101237442e 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -127,7 +127,7 @@ config PA11
 
 config PREFETCH
 	def_bool y
-	depends on PA8X00
+	depends on PA8X00 || PA7200
 
 config 64BIT
 	bool "64-bit kernel"
diff --git a/arch/parisc/hpux/fs.c b/arch/parisc/hpux/fs.c
index 6e79dbf3f6bd..2d58b92b57e3 100644
--- a/arch/parisc/hpux/fs.c
+++ b/arch/parisc/hpux/fs.c
@@ -96,7 +96,7 @@ static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
 	put_user(namlen, &dirent->d_namlen);
 	copy_to_user(dirent->d_name, name, namlen);
 	put_user(0, dirent->d_name + namlen);
-	((char *) dirent) += reclen;
+	dirent = (void __user *)dirent + reclen;
 	buf->current_dir = dirent;
 	buf->count -= reclen;
 	return 0;
diff --git a/arch/parisc/kernel/binfmt_elf32.c b/arch/parisc/kernel/binfmt_elf32.c
index d1833f164bbe..1e64e7b88110 100644
--- a/arch/parisc/kernel/binfmt_elf32.c
+++ b/arch/parisc/kernel/binfmt_elf32.c
@@ -87,7 +87,7 @@ struct elf_prpsinfo32
  */
 
 #define SET_PERSONALITY(ex, ibcs2) \
-	current->personality = PER_LINUX32; \
+	set_thread_flag(TIF_32BIT); \
 	current->thread.map_base = DEFAULT_MAP_BASE32; \
 	current->thread.task_size = DEFAULT_TASK_SIZE32 \
 
@@ -102,25 +102,3 @@ cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
 }
 
 #include "../../../fs/binfmt_elf.c"
-
-/* Set up a separate execution domain for ELF32 binaries running
- * on an ELF64 kernel */
-
-static struct exec_domain parisc32_exec_domain = { 
-	.name = "Linux/ELF32",
-	.pers_low = PER_LINUX32,
-	.pers_high = PER_LINUX32,
-};      
-
-static int __init parisc32_exec_init(void)
-{
-	/* steal the identity signal mappings from the default domain */
-	parisc32_exec_domain.signal_map = default_exec_domain.signal_map;
-	parisc32_exec_domain.signal_invmap = default_exec_domain.signal_invmap;
-
-	register_exec_domain(&parisc32_exec_domain);
-
-	return 0;
-}
-
-__initcall(parisc32_exec_init);
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index bc7c4a4e26a1..0be51e92a2fc 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -35,15 +35,12 @@ int icache_stride __read_mostly;
 EXPORT_SYMBOL(dcache_stride);
 
 
-#if defined(CONFIG_SMP)
 /* On some machines (e.g. ones with the Merced bus), there can be
  * only a single PxTLB broadcast at a time; this must be guaranteed
  * by software.  We put a spinlock around all TLB flushes  to
  * ensure this.
  */
 DEFINE_SPINLOCK(pa_tlb_lock);
-EXPORT_SYMBOL(pa_tlb_lock);
-#endif
 
 struct pdc_cache_info cache_info __read_mostly;
 #ifndef CONFIG_PA20
@@ -91,7 +88,8 @@ update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
 
 		flush_kernel_dcache_page(page);
 		clear_bit(PG_dcache_dirty, &page->flags);
-	}
+	} else if (parisc_requires_coherency())
+		flush_kernel_dcache_page(page);
 }
 
 void
@@ -370,3 +368,45 @@ void parisc_setup_cache_timing(void)
 
 	printk(KERN_INFO "Setting cache flush threshold to %x (%d CPUs online)\n", parisc_cache_flush_threshold, num_online_cpus());
 }
+
+extern void purge_kernel_dcache_page(unsigned long);
+extern void clear_user_page_asm(void *page, unsigned long vaddr);
+
+void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
+{
+	purge_kernel_dcache_page((unsigned long)page);
+	purge_tlb_start();
+	pdtlb_kernel(page);
+	purge_tlb_end();
+	clear_user_page_asm(page, vaddr);
+}
+EXPORT_SYMBOL(clear_user_page);
+
+void flush_kernel_dcache_page_addr(void *addr)
+{
+	flush_kernel_dcache_page_asm(addr);
+	purge_tlb_start();
+	pdtlb_kernel(addr);
+	purge_tlb_end();
+}
+EXPORT_SYMBOL(flush_kernel_dcache_page_addr);
+
+void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
+		    struct page *pg)
+{
+	/* no coherency needed (all in kmap/kunmap) */
+	copy_user_page_asm(vto, vfrom);
+	if (!parisc_requires_coherency())
+		flush_kernel_dcache_page_asm(vto);
+}
+EXPORT_SYMBOL(copy_user_page);
+
+#ifdef CONFIG_PA8X00
+
+void kunmap_parisc(void *addr)
+{
+	if (parisc_requires_coherency())
+		flush_kernel_dcache_page_addr(addr);
+}
+EXPORT_SYMBOL(kunmap_parisc);
+#endif
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 192357a3b9fe..340b5e8d67ba 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -30,6 +30,7 @@
 
 
 #include <asm/psw.h>
+#include <asm/cache.h>		/* for L1_CACHE_SHIFT */
 #include <asm/assembly.h>	/* for LDREG/STREG defines */
 #include <asm/pgtable.h>
 #include <asm/signal.h>
@@ -478,11 +479,7 @@
 	bb,>=,n		\pmd,_PxD_PRESENT_BIT,\fault
 	DEP		%r0,31,PxD_FLAG_SHIFT,\pmd /* clear flags */
 	copy		\pmd,%r9
-#ifdef CONFIG_64BIT
-	shld		%r9,PxD_VALUE_SHIFT,\pmd
-#else
-	shlw		%r9,PxD_VALUE_SHIFT,\pmd
-#endif
+	SHLREG		%r9,PxD_VALUE_SHIFT,\pmd
 	EXTR		\va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index
 	DEP		%r0,31,PAGE_SHIFT,\pmd  /* clear offset */
 	shladd		\index,BITS_PER_PTE_ENTRY,\pmd,\pmd
@@ -970,11 +967,7 @@ intr_return:
 	/* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) amount
 	** irq_stat[] is defined using ____cacheline_aligned.
 	*/
-#ifdef CONFIG_64BIT
-	shld	%r1, 6, %r20
-#else
-	shlw	%r1, 5, %r20
-#endif
+	SHLREG	%r1,L1_CACHE_SHIFT,%r20
 	add     %r19,%r20,%r19	/* now have &irq_stat[smp_processor_id()] */
 #endif /* CONFIG_SMP */
 
@@ -1076,7 +1069,7 @@ intr_do_preempt:
 	BL	preempt_schedule_irq, %r2
 	nop
 
-	b	intr_restore		/* ssm PSW_SM_I done by intr_restore */
+	b,n	intr_restore		/* ssm PSW_SM_I done by intr_restore */
 #endif /* CONFIG_PREEMPT */
 
 	.import do_signal,code
@@ -2115,11 +2108,7 @@ syscall_check_bh:
 	ldw     TI_CPU-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 /* cpu # */
 
 	/* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) bits */
-#ifdef CONFIG_64BIT
-	shld	%r26, 6, %r20
-#else
-	shlw	%r26, 5, %r20
-#endif
+	SHLREG	%r26,L1_CACHE_SHIFT,%r20
 	add     %r19,%r20,%r19	/* now have &irq_stat[smp_processor_id()] */
 #endif /* CONFIG_SMP */
 
diff --git a/arch/parisc/kernel/hardware.c b/arch/parisc/kernel/hardware.c
index 3058bffd8a2c..18ba4cb9159b 100644
--- a/arch/parisc/kernel/hardware.c
+++ b/arch/parisc/kernel/hardware.c
@@ -231,6 +231,7 @@ static struct hp_hardware hp_hardware_list[] __initdata = {
 	{HPHW_NPROC,0x5E6,0x4,0x91,"Keystone/Matterhorn W2 650"},
 	{HPHW_NPROC,0x5E7,0x4,0x91,"Caribe W2 800"},
 	{HPHW_NPROC,0x5E8,0x4,0x91,"Pikes Peak W2"},
+	{HPHW_NPROC,0x5EB,0x4,0x91,"Perf/Leone 875 W2+"},
 	{HPHW_NPROC,0x5FF,0x4,0x91,"Hitachi W"},
 	{HPHW_NPROC,0x600,0x4,0x81,"Gecko (712/60)"},
 	{HPHW_NPROC,0x601,0x4,0x81,"Gecko 80 (712/80)"},
@@ -584,8 +585,10 @@ static struct hp_hardware hp_hardware_list[] __initdata = {
 	{HPHW_CONSOLE, 0x01A, 0x0001F, 0x00, "Jason/Anole 64 Null Console"}, 
 	{HPHW_CONSOLE, 0x01B, 0x0001F, 0x00, "Jason/Anole 100 Null Console"}, 
 	{HPHW_FABRIC, 0x004, 0x000AA, 0x80, "Halfdome DNA Central Agent"}, 
+	{HPHW_FABRIC, 0x005, 0x000AA, 0x80, "Keystone DNA Central Agent"},
 	{HPHW_FABRIC, 0x007, 0x000AA, 0x80, "Caribe DNA Central Agent"}, 
 	{HPHW_FABRIC, 0x004, 0x000AB, 0x00, "Halfdome TOGO Fabric Crossbar"}, 
+	{HPHW_FABRIC, 0x005, 0x000AB, 0x00, "Keystone TOGO Fabric Crossbar"},
 	{HPHW_FABRIC, 0x004, 0x000AC, 0x00, "Halfdome Sakura Fabric Router"}, 
 	{HPHW_FIO, 0x025, 0x0002E, 0x80, "Armyknife Optional X.25"}, 
 	{HPHW_FIO, 0x004, 0x0004F, 0x0, "8-Port X.25 EISA-ACC (AMSO)"}, 
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index 5b8803cc3d69..9bdd0197ceb7 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -45,6 +45,17 @@ extern irqreturn_t ipi_interrupt(int, void *, struct pt_regs *);
 */
 static volatile unsigned long cpu_eiem = 0;
 
+/*
+** ack bitmap ... habitually set to 1, but reset to zero
+** between ->ack() and ->end() of the interrupt to prevent
+** re-interruption of a processing interrupt.
+*/
+static volatile unsigned long global_ack_eiem = ~0UL;
+/*
+** Local bitmap, same as above but for per-cpu interrupts
+*/
+static DEFINE_PER_CPU(unsigned long, local_ack_eiem) = ~0UL;
+
 static void cpu_disable_irq(unsigned int irq)
 {
 	unsigned long eirr_bit = EIEM_MASK(irq);
@@ -62,13 +73,6 @@ static void cpu_enable_irq(unsigned int irq)
 
 	cpu_eiem |= eirr_bit;
 
-	/* FIXME: while our interrupts aren't nested, we cannot reset
-	 * the eiem mask if we're already in an interrupt.  Once we
-	 * implement nested interrupts, this can go away
-	 */
-	if (!in_interrupt())
-		set_eiem(cpu_eiem);
-
 	/* This is just a simple NOP IPI.  But what it does is cause
 	 * all the other CPUs to do a set_eiem(cpu_eiem) at the end
 	 * of the interrupt handler */
@@ -84,13 +88,45 @@ static unsigned int cpu_startup_irq(unsigned int irq)
 void no_ack_irq(unsigned int irq) { }
 void no_end_irq(unsigned int irq) { }
 
+void cpu_ack_irq(unsigned int irq)
+{
+	unsigned long mask = EIEM_MASK(irq);
+	int cpu = smp_processor_id();
+
+	/* Clear in EIEM so we can no longer process */
+	if (CHECK_IRQ_PER_CPU(irq_desc[irq].status))
+		per_cpu(local_ack_eiem, cpu) &= ~mask;
+	else
+		global_ack_eiem &= ~mask;
+
+	/* disable the interrupt */
+	set_eiem(cpu_eiem & global_ack_eiem & per_cpu(local_ack_eiem, cpu));
+	/* and now ack it */
+	mtctl(mask, 23);
+}
+
+void cpu_end_irq(unsigned int irq)
+{
+	unsigned long mask = EIEM_MASK(irq);
+	int cpu = smp_processor_id();
+
+	/* set it in the eiems---it's no longer in process */
+	if (CHECK_IRQ_PER_CPU(irq_desc[irq].status))
+		per_cpu(local_ack_eiem, cpu) |= mask;
+	else
+		global_ack_eiem |= mask;
+
+	/* enable the interrupt */
+	set_eiem(cpu_eiem & global_ack_eiem & per_cpu(local_ack_eiem, cpu));
+}
+
 #ifdef CONFIG_SMP
 int cpu_check_affinity(unsigned int irq, cpumask_t *dest)
 {
 	int cpu_dest;
 
 	/* timer and ipi have to always be received on all CPUs */
-	if (irq == TIMER_IRQ || irq == IPI_IRQ) {
+	if (CHECK_IRQ_PER_CPU(irq)) {
 		/* Bad linux design decision.  The mask has already
 		 * been set; we must reset it */
 		irq_desc[irq].affinity = CPU_MASK_ALL;
@@ -119,8 +155,8 @@ static struct hw_interrupt_type cpu_interrupt_type = {
 	.shutdown	= cpu_disable_irq,
 	.enable		= cpu_enable_irq,
 	.disable	= cpu_disable_irq,
-	.ack		= no_ack_irq,
-	.end		= no_end_irq,
+	.ack		= cpu_ack_irq,
+	.end		= cpu_end_irq,
 #ifdef CONFIG_SMP
 	.set_affinity	= cpu_set_affinity_irq,
 #endif
@@ -209,7 +245,7 @@ int show_interrupts(struct seq_file *p, void *v)
 ** Then use that to get the Transaction address and data.
 */
 
-int cpu_claim_irq(unsigned int irq, struct hw_interrupt_type *type, void *data)
+int cpu_claim_irq(unsigned int irq, struct irq_chip *type, void *data)
 {
 	if (irq_desc[irq].action)
 		return -EBUSY;
@@ -298,82 +334,69 @@ unsigned int txn_alloc_data(unsigned int virt_irq)
 	return virt_irq - CPU_IRQ_BASE;
 }
 
+static inline int eirr_to_irq(unsigned long eirr)
+{
+#ifdef CONFIG_64BIT
+	int bit = fls64(eirr);
+#else
+	int bit = fls(eirr);
+#endif
+	return (BITS_PER_LONG - bit) + TIMER_IRQ;
+}
+
 /* ONLY called from entry.S:intr_extint() */
 void do_cpu_irq_mask(struct pt_regs *regs)
 {
 	unsigned long eirr_val;
-
-	irq_enter();
-
-	/*
-	 * Don't allow TIMER or IPI nested interrupts.
-	 * Allowing any single interrupt to nest can lead to that CPU
-	 * handling interrupts with all enabled interrupts unmasked.
-	 */
-	set_eiem(0UL);
-
-	/* 1) only process IRQs that are enabled/unmasked (cpu_eiem)
-	 * 2) We loop here on EIRR contents in order to avoid
-	 *    nested interrupts or having to take another interrupt
-	 *    when we could have just handled it right away.
-	 */
-	for (;;) {
-		unsigned long bit = (1UL << (BITS_PER_LONG - 1));
-		unsigned int irq;
-		eirr_val = mfctl(23) & cpu_eiem;
-		if (!eirr_val)
-			break;
-
-		mtctl(eirr_val, 23); /* reset bits we are going to process */
-
-		/* Work our way from MSb to LSb...same order we alloc EIRs */
-		for (irq = TIMER_IRQ; eirr_val && bit; bit>>=1, irq++) {
+	int irq, cpu = smp_processor_id();
 #ifdef CONFIG_SMP
-			cpumask_t dest = irq_desc[irq].affinity;
+	cpumask_t dest;
 #endif
-			if (!(bit & eirr_val))
-				continue;
 
-			/* clear bit in mask - can exit loop sooner */
-			eirr_val &= ~bit;
+	local_irq_disable();
+	irq_enter();
 
-#ifdef CONFIG_SMP
-			/* FIXME: because generic set affinity mucks
-			 * with the affinity before sending it to us
-			 * we can get the situation where the affinity is
-			 * wrong for our CPU type interrupts */
-			if (irq != TIMER_IRQ && irq != IPI_IRQ &&
-			    !cpu_isset(smp_processor_id(), dest)) {
-				int cpu = first_cpu(dest);
-
-				printk(KERN_DEBUG "redirecting irq %d from CPU %d to %d\n",
-				       irq, smp_processor_id(), cpu);
-				gsc_writel(irq + CPU_IRQ_BASE,
-					   cpu_data[cpu].hpa);
-				continue;
-			}
-#endif
+	eirr_val = mfctl(23) & cpu_eiem & global_ack_eiem &
+		per_cpu(local_ack_eiem, cpu);
+	if (!eirr_val)
+		goto set_out;
+	irq = eirr_to_irq(eirr_val);
 
-			__do_IRQ(irq, regs);
-		}
+#ifdef CONFIG_SMP
+	dest = irq_desc[irq].affinity;
+	if (CHECK_IRQ_PER_CPU(irq_desc[irq].status) &&
+	    !cpu_isset(smp_processor_id(), dest)) {
+		int cpu = first_cpu(dest);
+
+		printk(KERN_DEBUG "redirecting irq %d from CPU %d to %d\n",
+		       irq, smp_processor_id(), cpu);
+		gsc_writel(irq + CPU_IRQ_BASE,
+			   cpu_data[cpu].hpa);
+		goto set_out;
 	}
+#endif
+	__do_IRQ(irq, regs);
 
-	set_eiem(cpu_eiem);	/* restore original mask */
+ out:
 	irq_exit();
-}
+	return;
 
+ set_out:
+	set_eiem(cpu_eiem & global_ack_eiem & per_cpu(local_ack_eiem, cpu));
+	goto out;
+}
 
 static struct irqaction timer_action = {
 	.handler = timer_interrupt,
 	.name = "timer",
-	.flags = IRQF_DISABLED,
+	.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_PERCPU,
 };
 
 #ifdef CONFIG_SMP
 static struct irqaction ipi_action = {
 	.handler = ipi_interrupt,
 	.name = "IPI",
-	.flags = IRQF_DISABLED,
+	.flags = IRQF_DISABLED | IRQF_PERCPU,
 };
 #endif
 
diff --git a/arch/parisc/kernel/processor.c b/arch/parisc/kernel/processor.c
index 99d7fca93104..fb81e5687e7c 100644
--- a/arch/parisc/kernel/processor.c
+++ b/arch/parisc/kernel/processor.c
@@ -143,8 +143,9 @@ static int __init processor_probe(struct parisc_device *dev)
 	p = &cpu_data[cpuid];
 	boot_cpu_data.cpu_count++;
 
-	/* initialize counters */
-	memset(p, 0, sizeof(struct cpuinfo_parisc));
+	/* initialize counters - CPU 0 gets it_value set in time_init() */
+	if (cpuid)
+		memset(p, 0, sizeof(struct cpuinfo_parisc));
 
 	p->loops_per_jiffy = loops_per_jiffy;
 	p->dev = dev;		/* Save IODC data in case we need it */
diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index bb83880c5ee3..ee6653edeb7a 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -26,7 +26,6 @@
 #include <linux/stddef.h>
 #include <linux/compat.h>
 #include <linux/elf.h>
-#include <linux/personality.h>
 #include <asm/ucontext.h>
 #include <asm/rt_sigframe.h>
 #include <asm/uaccess.h>
@@ -433,13 +432,13 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	if (in_syscall) {
 		regs->gr[31] = haddr;
 #ifdef __LP64__
-		if (personality(current->personality) == PER_LINUX)
+		if (!test_thread_flag(TIF_32BIT))
 			sigframe_size |= 1;
 #endif
 	} else {
 		unsigned long psw = USER_PSW;
 #ifdef __LP64__
-		if (personality(current->personality) == PER_LINUX)
+		if (!test_thread_flag(TIF_32BIT))
 			psw |= PSW_W;
 #endif
 
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 98e40959a564..faad338f310e 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -262,6 +262,9 @@ ipi_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 					this_cpu, which);
 				return IRQ_NONE;
 			} /* Switch */
+		/* let in any pending interrupts */
+		local_irq_enable();
+		local_irq_disable();
 		} /* while (ops) */
 	}
 	return IRQ_HANDLED;
@@ -430,8 +433,9 @@ smp_do_timer(struct pt_regs *regs)
 static void __init
 smp_cpu_init(int cpunum)
 {
-	extern int init_per_cpu(int);  /* arch/parisc/kernel/setup.c */
+	extern int init_per_cpu(int);  /* arch/parisc/kernel/processor.c */
 	extern void init_IRQ(void);    /* arch/parisc/kernel/irq.c */
+	extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */
 
 	/* Set modes and Enable floating point coprocessor */
 	(void) init_per_cpu(cpunum);
@@ -457,6 +461,7 @@ smp_cpu_init(int cpunum)
 	enter_lazy_tlb(&init_mm, current);
 
 	init_IRQ();   /* make sure no IRQ's are enabled or pending */
+	start_cpu_itimer();
 }
 
 
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 8b5df98e2b31..1db5588ceacf 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -31,6 +31,8 @@
 #include <linux/shm.h>
 #include <linux/smp_lock.h>
 #include <linux/syscalls.h>
+#include <linux/utsname.h>
+#include <linux/personality.h>
 
 int sys_pipe(int __user *fildes)
 {
@@ -248,3 +250,46 @@ asmlinkage int sys_free_hugepages(unsigned long addr)
 {
 	return -EINVAL;
 }
+
+long parisc_personality(unsigned long personality)
+{
+	long err;
+
+	if (personality(current->personality) == PER_LINUX32
+	    && personality == PER_LINUX)
+		personality = PER_LINUX32;
+
+	err = sys_personality(personality);
+	if (err == PER_LINUX32)
+		err = PER_LINUX;
+
+	return err;
+}
+
+static inline int override_machine(char __user *mach) {
+#ifdef CONFIG_COMPAT
+	if (personality(current->personality) == PER_LINUX32) {
+		if (__put_user(0, mach + 6) ||
+		    __put_user(0, mach + 7))
+			return -EFAULT;
+	}
+
+	return 0;
+#else /*!CONFIG_COMPAT*/
+	return 0;
+#endif /*CONFIG_COMPAT*/
+}
+
+long parisc_newuname(struct new_utsname __user *utsname)
+{
+	int err = 0;
+
+	down_read(&uts_sem);
+	if (copy_to_user(utsname, &system_utsname, sizeof(*utsname)))
+		err = -EFAULT;
+	up_read(&uts_sem);
+
+	err = override_machine(utsname->machine);
+
+	return (long)err;
+}
diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S
index e27b432f90a8..701d66a596e8 100644
--- a/arch/parisc/kernel/syscall_table.S
+++ b/arch/parisc/kernel/syscall_table.S
@@ -132,7 +132,7 @@
 	ENTRY_SAME(socketpair)
 	ENTRY_SAME(setpgid)
 	ENTRY_SAME(send)
-	ENTRY_SAME(newuname)
+	ENTRY_OURS(newuname)
 	ENTRY_SAME(umask)		/* 60 */
 	ENTRY_SAME(chroot)
 	ENTRY_SAME(ustat)
@@ -221,7 +221,7 @@
 	ENTRY_SAME(fchdir)
 	ENTRY_SAME(bdflush)
 	ENTRY_SAME(sysfs)		/* 135 */
-	ENTRY_SAME(personality)
+	ENTRY_OURS(personality)
 	ENTRY_SAME(ni_syscall)	/* for afs_syscall */
 	ENTRY_SAME(setfsuid)
 	ENTRY_SAME(setfsgid)
diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index ab641d67f551..b3496b592a2d 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -32,8 +32,7 @@
 
 #include <linux/timex.h>
 
-static long clocktick __read_mostly;	/* timer cycles per tick */
-static long halftick __read_mostly;
+static unsigned long clocktick __read_mostly;	/* timer cycles per tick */
 
 #ifdef CONFIG_SMP
 extern void smp_do_timer(struct pt_regs *regs);
@@ -41,46 +40,106 @@ extern void smp_do_timer(struct pt_regs *regs);
 
 irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 {
-	long now;
-	long next_tick;
-	int nticks;
-	int cpu = smp_processor_id();
+	unsigned long now;
+	unsigned long next_tick;
+	unsigned long cycles_elapsed;
+	unsigned long cycles_remainder;
+	unsigned int cpu = smp_processor_id();
+
+	/* gcc can optimize for "read-only" case with a local clocktick */
+	unsigned long cpt = clocktick;
 
 	profile_tick(CPU_PROFILING, regs);
 
-	now = mfctl(16);
-	/* initialize next_tick to time at last clocktick */
+	/* Initialize next_tick to the expected tick time. */
 	next_tick = cpu_data[cpu].it_value;
 
-	/* since time passes between the interrupt and the mfctl()
-	 * above, it is never true that last_tick + clocktick == now.  If we
-	 * never miss a clocktick, we could set next_tick = last_tick + clocktick
-	 * but maybe we'll miss ticks, hence the loop.
-	 *
-	 * Variables are *signed*.
+	/* Get current interval timer.
+	 * CR16 reads as 64 bits in CPU wide mode.
+	 * CR16 reads as 32 bits in CPU narrow mode.
 	 */
+	now = mfctl(16);
+
+	cycles_elapsed = now - next_tick;
 
-	nticks = 0;
-	while((next_tick - now) < halftick) {
-		next_tick += clocktick;
-		nticks++;
+	if ((cycles_elapsed >> 5) < cpt) {
+		/* use "cheap" math (add/subtract) instead
+		 * of the more expensive div/mul method
+		 */
+		cycles_remainder = cycles_elapsed;
+		while (cycles_remainder > cpt) {
+			cycles_remainder -= cpt;
+		}
+	} else {
+		cycles_remainder = cycles_elapsed % cpt;
 	}
-	mtctl(next_tick, 16);
+
+	/* Can we differentiate between "early CR16" (aka Scenario 1) and
+	 * "long delay" (aka Scenario 3)? I don't think so.
+	 *
+	 * We expected timer_interrupt to be delivered at least a few hundred
+	 * cycles after the IT fires. But it's arbitrary how much time passes
+	 * before we call it "late". I've picked one second.
+	 */
+/* aproximate HZ with shifts. Intended math is "(elapsed/clocktick) > HZ" */
+#if HZ == 1000
+	if (cycles_elapsed > (cpt << 10) )
+#elif HZ == 250
+	if (cycles_elapsed > (cpt << 8) )
+#elif HZ == 100
+	if (cycles_elapsed > (cpt << 7) )
+#else
+#warn WTF is HZ set to anyway?
+	if (cycles_elapsed > (HZ * cpt) )
+#endif
+	{
+		/* Scenario 3: very long delay?  bad in any case */
+		printk (KERN_CRIT "timer_interrupt(CPU %d): delayed!"
+			" cycles %lX rem %lX "
+			" next/now %lX/%lX\n",
+			cpu,
+			cycles_elapsed, cycles_remainder,
+			next_tick, now );
+	}
+
+	/* convert from "division remainder" to "remainder of clock tick" */
+	cycles_remainder = cpt - cycles_remainder;
+
+	/* Determine when (in CR16 cycles) next IT interrupt will fire.
+	 * We want IT to fire modulo clocktick even if we miss/skip some.
+	 * But those interrupts don't in fact get delivered that regularly.
+	 */
+	next_tick = now + cycles_remainder;
+
 	cpu_data[cpu].it_value = next_tick;
 
-	while (nticks--) {
+	/* Skip one clocktick on purpose if we are likely to miss next_tick.
+	 * We want to avoid the new next_tick being less than CR16.
+	 * If that happened, itimer wouldn't fire until CR16 wrapped.
+	 * We'll catch the tick we missed on the tick after that.
+	 */
+	if (!(cycles_remainder >> 13))
+		next_tick += cpt;
+
+	/* Program the IT when to deliver the next interrupt. */
+        /* Only bottom 32-bits of next_tick are written to cr16.  */
+	mtctl(next_tick, 16);
+
+
+	/* Done mucking with unreliable delivery of interrupts.
+	 * Go do system house keeping.
+	 */
 #ifdef CONFIG_SMP
-		smp_do_timer(regs);
+	smp_do_timer(regs);
 #else
-		update_process_times(user_mode(regs));
+	update_process_times(user_mode(regs));
 #endif
-		if (cpu == 0) {
-			write_seqlock(&xtime_lock);
-			do_timer(1);
-			write_sequnlock(&xtime_lock);
-		}
+	if (cpu == 0) {
+		write_seqlock(&xtime_lock);
+		do_timer(regs);
+		write_sequnlock(&xtime_lock);
 	}
-    
+
 	/* check soft power switch status */
 	if (cpu == 0 && !atomic_read(&power_tasklet.count))
 		tasklet_schedule(&power_tasklet);
@@ -106,14 +165,12 @@ unsigned long profile_pc(struct pt_regs *regs)
 EXPORT_SYMBOL(profile_pc);
 
 
-/*** converted from ia64 ***/
 /*
  * Return the number of micro-seconds that elapsed since the last
  * update to wall time (aka xtime).  The xtime_lock
  * must be at least read-locked when calling this routine.
  */
-static inline unsigned long
-gettimeoffset (void)
+static inline unsigned long gettimeoffset (void)
 {
 #ifndef CONFIG_SMP
 	/*
@@ -121,21 +178,44 @@ gettimeoffset (void)
 	 *    Once parisc-linux learns the cr16 difference between processors,
 	 *    this could be made to work.
 	 */
-	long last_tick;
-	long elapsed_cycles;
-
-	/* it_value is the intended time of the next tick */
-	last_tick = cpu_data[smp_processor_id()].it_value;
-
-	/* Subtract one tick and account for possible difference between
-	 * when we expected the tick and when it actually arrived.
-	 * (aka wall vs real)
-	 */
-	last_tick -= clocktick * (jiffies - wall_jiffies + 1);
-	elapsed_cycles = mfctl(16) - last_tick;
+	unsigned long now;
+	unsigned long prev_tick;
+	unsigned long next_tick;
+	unsigned long elapsed_cycles;
+	unsigned long usec;
+	unsigned long cpuid = smp_processor_id();
+	unsigned long cpt = clocktick;
+
+	next_tick = cpu_data[cpuid].it_value;
+	now = mfctl(16);	/* Read the hardware interval timer.  */
+
+	prev_tick = next_tick - cpt;
+
+	/* Assume Scenario 1: "now" is later than prev_tick.  */
+	elapsed_cycles = now - prev_tick;
+
+/* aproximate HZ with shifts. Intended math is "(elapsed/clocktick) > HZ" */
+#if HZ == 1000
+	if (elapsed_cycles > (cpt << 10) )
+#elif HZ == 250
+	if (elapsed_cycles > (cpt << 8) )
+#elif HZ == 100
+	if (elapsed_cycles > (cpt << 7) )
+#else
+#warn WTF is HZ set to anyway?
+	if (elapsed_cycles > (HZ * cpt) )
+#endif
+	{
+		/* Scenario 3: clock ticks are missing. */
+		printk (KERN_CRIT "gettimeoffset(CPU %ld): missing %ld ticks!"
+			" cycles %lX prev/now/next %lX/%lX/%lX  clock %lX\n",
+			cpuid, elapsed_cycles / cpt,
+			elapsed_cycles, prev_tick, now, next_tick, cpt);
+	}
 
-	/* the precision of this math could be improved */
-	return elapsed_cycles / (PAGE0->mem_10msec / 10000);
+	/* FIXME: Can we improve the precision? Not with PAGE0. */
+	usec = (elapsed_cycles * 10000) / PAGE0->mem_10msec;
+	return usec;
 #else
 	return 0;
 #endif
@@ -146,6 +226,7 @@ do_gettimeofday (struct timeval *tv)
 {
 	unsigned long flags, seq, usec, sec;
 
+	/* Hold xtime_lock and adjust timeval.  */
 	do {
 		seq = read_seqbegin_irqsave(&xtime_lock, flags);
 		usec = gettimeoffset();
@@ -153,25 +234,13 @@ do_gettimeofday (struct timeval *tv)
 		usec += (xtime.tv_nsec / 1000);
 	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
 
-	if (unlikely(usec > LONG_MAX)) {
-		/* This can happen if the gettimeoffset adjustment is
-		 * negative and xtime.tv_nsec is smaller than the
-		 * adjustment */
-		printk(KERN_ERR "do_gettimeofday() spurious xtime.tv_nsec of %ld\n", usec);
-		usec += USEC_PER_SEC;
-		--sec;
-		/* This should never happen, it means the negative
-		 * time adjustment was more than a second, so there's
-		 * something seriously wrong */
-		BUG_ON(usec > LONG_MAX);
-	}
-
-
+	/* Move adjusted usec's into sec's.  */
 	while (usec >= USEC_PER_SEC) {
 		usec -= USEC_PER_SEC;
 		++sec;
 	}
 
+	/* Return adjusted result.  */
 	tv->tv_sec = sec;
 	tv->tv_usec = usec;
 }
@@ -223,22 +292,23 @@ unsigned long long sched_clock(void)
 }
 
 
+void __init start_cpu_itimer(void)
+{
+	unsigned int cpu = smp_processor_id();
+	unsigned long next_tick = mfctl(16) + clocktick;
+
+	mtctl(next_tick, 16);		/* kick off Interval Timer (CR16) */
+
+	cpu_data[cpu].it_value = next_tick;
+}
+
 void __init time_init(void)
 {
-	unsigned long next_tick;
 	static struct pdc_tod tod_data;
 
 	clocktick = (100 * PAGE0->mem_10msec) / HZ;
-	halftick = clocktick / 2;
 
-	/* Setup clock interrupt timing */
-
-	next_tick = mfctl(16);
-	next_tick += clocktick;
-	cpu_data[smp_processor_id()].it_value = next_tick;
-
-	/* kick off Itimer (CR16) */
-	mtctl(next_tick, 16);
+	start_cpu_itimer();	/* get CPU 0 started */
 
 	if(pdc_tod_read(&tod_data) == 0) {
 		write_seqlock_irq(&xtime_lock);
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 77b28cb8aca6..65cd6ca32fed 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -16,6 +16,7 @@
 #include <linux/errno.h>
 #include <linux/ptrace.h>
 #include <linux/timer.h>
+#include <linux/delay.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/smp.h>
@@ -245,6 +246,15 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
 		current->comm, current->pid, str, err);
 	show_regs(regs);
 
+	if (in_interrupt())
+		panic("Fatal exception in interrupt");
+
+	if (panic_on_oops) {
+		printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
+		ssleep(5);
+		panic("Fatal exception");
+	}
+
 	/* Wot's wrong wif bein' racy? */
 	if (current->thread.flags & PARISC_KERNEL_DEATH) {
 		printk(KERN_CRIT "%s() recursion detected.\n", __FUNCTION__);
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 25ad28d63e88..0667f2b4f977 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -31,10 +31,7 @@
 
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
-extern char _text;	/* start of kernel code, defined by linker */
 extern int  data_start;
-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] __read_mostly;
@@ -319,8 +316,8 @@ static void __init setup_bootmem(void)
 
 	reserve_bootmem_node(NODE_DATA(0), 0UL,
 			(unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
-	reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text),
-			(unsigned long)(&_end - &_text));
+	reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
+			(unsigned long)(_end - _text));
 	reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 			((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
 
@@ -355,8 +352,8 @@ static void __init setup_bootmem(void)
 #endif
 
 	data_resource.start =  virt_to_phys(&data_start);
-	data_resource.end = virt_to_phys(&_end)-1;
-	code_resource.start = virt_to_phys(&_text);
+	data_resource.end = virt_to_phys(_end) - 1;
+	code_resource.start = virt_to_phys(_text);
 	code_resource.end = virt_to_phys(&data_start)-1;
 
 	/* We don't know which region the kernel will be in, so try
@@ -385,12 +382,12 @@ void free_initmem(void)
 	 */
 	local_irq_disable();
 
-	memset(&__init_begin, 0x00, 
-		(unsigned long)&__init_end - (unsigned long)&__init_begin);
+	memset(__init_begin, 0x00,
+		(unsigned long)__init_end - (unsigned long)__init_begin);
 
 	flush_data_cache();
 	asm volatile("sync" : : );
-	flush_icache_range((unsigned long)&__init_begin, (unsigned long)&__init_end);
+	flush_icache_range((unsigned long)__init_begin, (unsigned long)__init_end);
 	asm volatile("sync" : : );
 
 	local_irq_enable();
@@ -398,8 +395,8 @@ void free_initmem(void)
 	
 	/* align __init_begin and __init_end to page size,
 	   ignoring linker script where we might have tried to save RAM */
-	init_begin = PAGE_ALIGN((unsigned long)(&__init_begin));
-	init_end   = PAGE_ALIGN((unsigned long)(&__init_end));
+	init_begin = PAGE_ALIGN((unsigned long)(__init_begin));
+	init_end   = PAGE_ALIGN((unsigned long)(__init_end));
 	for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(addr));
 		init_page_count(virt_to_page(addr));
@@ -578,7 +575,7 @@ static void __init map_pages(unsigned long start_vaddr, unsigned long start_padd
 	extern const unsigned long fault_vector_20;
 	extern void * const linux_gateway_page;
 
-	ro_start = __pa((unsigned long)&_text);
+	ro_start = __pa((unsigned long)_text);
 	ro_end   = __pa((unsigned long)&data_start);
 	fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 	gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
index 27384567a1d0..47a1d2ac9419 100644
--- a/arch/parisc/mm/ioremap.c
+++ b/arch/parisc/mm/ioremap.c
@@ -188,7 +188,7 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 }
 EXPORT_SYMBOL(__ioremap);
 
-void iounmap(void __iomem *addr)
+void iounmap(const volatile void __iomem *addr)
 {
 	if (addr > high_memory)
 		return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));