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

* git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6: (23 commits)
  parisc: move dereference_function_descriptor to process.c
  parisc: Move kernel Elf_Fdesc define to <asm/elf.h>
  parisc: fix build when ARCH_HAS_KMAP
  parisc: fix "make tar-pkg"
  parisc: drivers: fix warnings
  parisc: select BUG always
  parisc: asm/pdc.h should include asm/page.h
  parisc: led: remove proc_dir_entry::owner
  parisc: fix macro expansion in atomic.h
  parisc: iosapic: fix build breakage
  parisc: oops_enter()/oops_exit() in die()
  parisc: document light weight syscall ABI
  parisc: blink all or loadavg LEDs on oops
  parisc: add ftrace (function and graph tracer) functionality
  parisc: simplify sys_clone()
  parisc: add LATENCYTOP_SUPPORT and CONFIG_STACKTRACE_SUPPORT
  parisc: allow to build with 16k default kernel page size
  parisc: expose 32/64-bit capabilities in cpuinfo
  parisc: use constants instead of numbers in assembly
  parisc: fix usage of 32bit PTE page table entries on 32bit kernels
  ...

arch/parisc/kernel/Makefile

@@ -11,10 +11,25 @@ obj-y	     	:= cache.o pacache.o setup.o traps.o time.o irq.o \
 		   process.o processor.o pdc_cons.o pdc_chassis.o unwind.o \
 		   topology.o
 
+ifdef CONFIG_FUNCTION_TRACER
+# Do not profile debug and lowlevel utilities
+CFLAGS_REMOVE_ftrace.o = -pg
+CFLAGS_REMOVE_cache.o = -pg
+CFLAGS_REMOVE_irq.o = -pg
+CFLAGS_REMOVE_pacache.o = -pg
+CFLAGS_REMOVE_perf.o = -pg
+CFLAGS_REMOVE_traps.o = -pg
+CFLAGS_REMOVE_unaligned.o = -pg
+CFLAGS_REMOVE_unwind.o = -pg
+endif
+
 obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_PA11)	+= pci-dma.o
 obj-$(CONFIG_PCI)	+= pci.o
 obj-$(CONFIG_MODULES)	+= module.o
 obj-$(CONFIG_64BIT)	+= binfmt_elf32.o sys_parisc32.o signal32.o
+obj-$(CONFIG_STACKTRACE)+= stacktrace.o
 # only supported for PCX-W/U in 64-bit mode at the moment
 obj-$(CONFIG_64BIT)	+= perf.o perf_asm.o
+obj-$(CONFIG_FUNCTION_TRACER)		+= ftrace.o
+obj-$(CONFIG_FUNCTION_GRAPH_TRACER)	+= ftrace.o

arch/parisc/kernel/entry.S

@@ -505,6 +505,18 @@
 	STREG		\pte,0(\ptep)
 	.endm
 
+	/* bitshift difference between a PFN (based on kernel's PAGE_SIZE)
+	 * to a CPU TLB 4k PFN (4k => 12 bits to shift) */
+	#define PAGE_ADD_SHIFT  (PAGE_SHIFT-12)
+
+	/* Drop prot bits and convert to page addr for iitlbt and idtlbt */
+	.macro		convert_for_tlb_insert20 pte
+	extrd,u		\pte,(63-ASM_PFN_PTE_SHIFT)+(63-58)+PAGE_ADD_SHIFT,\
+				64-PAGE_SHIFT-PAGE_ADD_SHIFT,\pte
+	depdi		_PAGE_SIZE_ENCODING_DEFAULT,63,\
+				(63-58)+PAGE_ADD_SHIFT,\pte
+	.endm
+
 	/* Convert the pte and prot to tlb insertion values.  How
 	 * this happens is quite subtle, read below */
 	.macro		make_insert_tlb	spc,pte,prot
@@ -544,8 +556,7 @@
 	depi		1,12,1,\prot
 
 	/* Drop prot bits and convert to page addr for iitlbt and idtlbt */
-	extrd,u		\pte,(63-ASM_PFN_PTE_SHIFT)+(63-58),64-PAGE_SHIFT,\pte
-	depdi		_PAGE_SIZE_ENCODING_DEFAULT,63,63-58,\pte
+	convert_for_tlb_insert20 \pte
 	.endm
 
 	/* Identical macro to make_insert_tlb above, except it
@@ -563,8 +574,8 @@
 
 	/* Get rid of prot bits and convert to page addr for iitlba */
 
-	depi		_PAGE_SIZE_ENCODING_DEFAULT,31,ASM_PFN_PTE_SHIFT,\pte
-	extru		\pte,24,25,\pte
+	depi		0,31,ASM_PFN_PTE_SHIFT,\pte
+	SHRREG		\pte,(ASM_PFN_PTE_SHIFT-(31-26)),\pte
 	.endm
 
 	/* This is for ILP32 PA2.0 only.  The TLB insertion needs
@@ -1244,10 +1255,9 @@ nadtlb_check_flush_20w:
 	depdi,z         7,7,3,prot
 	depdi           1,10,1,prot
 
-	/* Get rid of prot bits and convert to page addr for idtlbt */
+	/* Drop prot bits from pte and convert to page addr for idtlbt */
+	convert_for_tlb_insert20 pte
 
-	depdi		0,63,12,pte
-	extrd,u         pte,56,52,pte
 	idtlbt          pte,prot
 
 	rfir
@@ -1337,8 +1347,8 @@ nadtlb_check_flush_11:
 
 	/* Get rid of prot bits and convert to page addr for idtlba */
 
-	depi		0,31,12,pte
-	extru		pte,24,25,pte
+	depi		0,31,ASM_PFN_PTE_SHIFT,pte
+	SHRREG		pte,(ASM_PFN_PTE_SHIFT-(31-26)),pte
 
 	mfsp		%sr1,t0  /* Save sr1 so we can use it in tlb inserts */
 	mtsp		spc,%sr1
@@ -1403,10 +1413,9 @@ nadtlb_check_flush_20:
 	depdi,z         7,7,3,prot
 	depdi           1,10,1,prot
 
-	/* Get rid of prot bits and convert to page addr for idtlbt */
+	/* Drop prot bits from pte and convert to page addr for idtlbt */
+	convert_for_tlb_insert20 pte
 
-	depdi		0,63,12,pte
-	extrd,u         pte,56,32,pte
 	idtlbt          pte,prot
 
 	rfir
@@ -2176,6 +2185,33 @@ syscall_do_resched:
 ENDPROC(syscall_exit)
 
 
+#ifdef CONFIG_FUNCTION_TRACER
+	.import ftrace_function_trampoline,code
+ENTRY(_mcount)
+	copy	%r3, %arg2
+	b	ftrace_function_trampoline
+	nop
+ENDPROC(_mcount)
+
+ENTRY(return_to_handler)
+	load32	return_trampoline, %rp
+	copy	%ret0, %arg0
+	copy	%ret1, %arg1
+	b	ftrace_return_to_handler
+	nop
+return_trampoline:
+	copy	%ret0, %rp
+	copy	%r23, %ret0
+	copy	%r24, %ret1
+
+.globl ftrace_stub
+ftrace_stub:
+	bv	%r0(%rp)
+	nop
+ENDPROC(return_to_handler)
+#endif	/* CONFIG_FUNCTION_TRACER */
+
+
 get_register:
 	/*
 	 * get_register is used by the non access tlb miss handlers to

arch/parisc/kernel/firmware.c

@@ -527,7 +527,11 @@ int pdc_model_capabilities(unsigned long *capabilities)
         pdc_result[0] = 0; /* preset zero (call may not be implemented!) */
         retval = mem_pdc_call(PDC_MODEL, PDC_MODEL_CAPABILITIES, __pa(pdc_result), 0);
         convert_to_wide(pdc_result);
-        *capabilities = pdc_result[0];
+        if (retval == PDC_OK) {
+                *capabilities = pdc_result[0];
+        } else {
+                *capabilities = PDC_MODEL_OS32;
+        }
         spin_unlock_irqrestore(&pdc_lock, flags);
 
         return retval;

arch/parisc/kernel/ftrace.c

@@ -0,0 +1,185 @@
+/*
+ * Code for tracing calls in Linux kernel.
+ * Copyright (C) 2009 Helge Deller <deller@gmx.de>
+ *
+ * based on code for x86 which is:
+ * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
+ *
+ * future possible enhancements:
+ * 	- add CONFIG_DYNAMIC_FTRACE
+ *	- add CONFIG_STACK_TRACER
+ */
+
+#include <linux/init.h>
+#include <linux/ftrace.h>
+
+#include <asm/sections.h>
+#include <asm/ftrace.h>
+
+
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+/* Add a function return address to the trace stack on thread info.*/
+static int push_return_trace(unsigned long ret, unsigned long long time,
+				unsigned long func, int *depth)
+{
+	int index;
+
+	if (!current->ret_stack)
+		return -EBUSY;
+
+	/* The return trace stack is full */
+	if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) {
+		atomic_inc(&current->trace_overrun);
+		return -EBUSY;
+	}
+
+	index = ++current->curr_ret_stack;
+	barrier();
+	current->ret_stack[index].ret = ret;
+	current->ret_stack[index].func = func;
+	current->ret_stack[index].calltime = time;
+	*depth = index;
+
+	return 0;
+}
+
+/* Retrieve a function return address to the trace stack on thread info.*/
+static void pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
+{
+	int index;
+
+	index = current->curr_ret_stack;
+
+	if (unlikely(index < 0)) {
+		ftrace_graph_stop();
+		WARN_ON(1);
+		/* Might as well panic, otherwise we have no where to go */
+		*ret = (unsigned long)
+			dereference_function_descriptor(&panic);
+		return;
+	}
+
+	*ret = current->ret_stack[index].ret;
+	trace->func = current->ret_stack[index].func;
+	trace->calltime = current->ret_stack[index].calltime;
+	trace->overrun = atomic_read(&current->trace_overrun);
+	trace->depth = index;
+	barrier();
+	current->curr_ret_stack--;
+
+}
+
+/*
+ * Send the trace to the ring-buffer.
+ * @return the original return address.
+ */
+unsigned long ftrace_return_to_handler(unsigned long retval0,
+				       unsigned long retval1)
+{
+	struct ftrace_graph_ret trace;
+	unsigned long ret;
+
+	pop_return_trace(&trace, &ret);
+	trace.rettime = cpu_clock(raw_smp_processor_id());
+	ftrace_graph_return(&trace);
+
+	if (unlikely(!ret)) {
+		ftrace_graph_stop();
+		WARN_ON(1);
+		/* Might as well panic. What else to do? */
+		ret = (unsigned long)
+			dereference_function_descriptor(&panic);
+	}
+
+	/* HACK: we hand over the old functions' return values
+	   in %r23 and %r24. Assembly in entry.S will take care
+	   and move those to their final registers %ret0 and %ret1 */
+	asm( "copy %0, %%r23 \n\t"
+	     "copy %1, %%r24 \n" : : "r" (retval0), "r" (retval1) );
+
+	return ret;
+}
+
+/*
+ * Hook the return address and push it in the stack of return addrs
+ * in current thread info.
+ */
+void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
+{
+	unsigned long old;
+	unsigned long long calltime;
+	struct ftrace_graph_ent trace;
+
+	if (unlikely(atomic_read(&current->tracing_graph_pause)))
+		return;
+
+	old = *parent;
+	*parent = (unsigned long)
+		  dereference_function_descriptor(&return_to_handler);
+
+	if (unlikely(!__kernel_text_address(old))) {
+		ftrace_graph_stop();
+		*parent = old;
+		WARN_ON(1);
+		return;
+	}
+
+	calltime = cpu_clock(raw_smp_processor_id());
+
+	if (push_return_trace(old, calltime,
+				self_addr, &trace.depth) == -EBUSY) {
+		*parent = old;
+		return;
+	}
+
+	trace.func = self_addr;
+
+	/* Only trace if the calling function expects to */
+	if (!ftrace_graph_entry(&trace)) {
+		current->curr_ret_stack--;
+		*parent = old;
+	}
+}
+
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+
+void ftrace_function_trampoline(unsigned long parent,
+				unsigned long self_addr,
+				unsigned long org_sp_gr3)
+{
+	extern ftrace_func_t ftrace_trace_function;
+
+	if (function_trace_stop)
+		return;
+
+	if (ftrace_trace_function != ftrace_stub) {
+		ftrace_trace_function(parent, self_addr);
+		return;
+	}
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+	if (ftrace_graph_entry && ftrace_graph_return) {
+		unsigned long sp;
+		unsigned long *parent_rp;
+
+                asm volatile ("copy %%r30, %0" : "=r"(sp));
+		/* sanity check: is stack pointer which we got from
+		   assembler function in entry.S in a reasonable
+		   range compared to current stack pointer? */
+		if ((sp - org_sp_gr3) > 0x400)
+			return;
+
+		/* calculate pointer to %rp in stack */
+		parent_rp = (unsigned long *) org_sp_gr3 - 0x10;
+		/* sanity check: parent_rp should hold parent */
+		if (*parent_rp != parent)
+			return;
+		
+		prepare_ftrace_return(parent_rp, self_addr);
+		return;
+	}
+#endif
+}
+

arch/parisc/kernel/irq.c

@@ -311,12 +311,12 @@ unsigned long txn_alloc_addr(unsigned int virt_irq)
 	next_cpu++; /* assign to "next" CPU we want this bugger on */
 
 	/* validate entry */
-	while ((next_cpu < NR_CPUS) &&
+	while ((next_cpu < nr_cpu_ids) &&
 		(!per_cpu(cpu_data, next_cpu).txn_addr ||
 		 !cpu_online(next_cpu)))
 		next_cpu++;
 
-	if (next_cpu >= NR_CPUS) 
+	if (next_cpu >= nr_cpu_ids) 
 		next_cpu = 0;	/* nothing else, assign monarch */
 
 	return txn_affinity_addr(virt_irq, next_cpu);

arch/parisc/kernel/module.c

@@ -61,9 +61,7 @@
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/bug.h>
-#include <linux/uaccess.h>
 
-#include <asm/sections.h>
 #include <asm/unwind.h>
 
 #if 0
@@ -115,8 +113,6 @@ struct got_entry {
 	Elf32_Addr addr;
 };
 
-#define Elf_Fdesc	Elf32_Fdesc
-
 struct stub_entry {
 	Elf32_Word insns[2]; /* each stub entry has two insns */
 };
@@ -125,8 +121,6 @@ struct got_entry {
 	Elf64_Addr addr;
 };
 
-#define Elf_Fdesc	Elf64_Fdesc
-
 struct stub_entry {
 	Elf64_Word insns[4]; /* each stub entry has four insns */
 };
@@ -916,15 +910,3 @@ void module_arch_cleanup(struct module *mod)
 	deregister_unwind_table(mod);
 	module_bug_cleanup(mod);
 }
-
-#ifdef CONFIG_64BIT
-void *dereference_function_descriptor(void *ptr)
-{
-	Elf64_Fdesc *desc = ptr;
-	void *p;
-
-	if (!probe_kernel_address(&desc->addr, p))
-		ptr = p;
-	return ptr;
-}
-#endif

arch/parisc/kernel/parisc_ksyms.c

@@ -153,5 +153,10 @@ EXPORT_SYMBOL(node_data);
 EXPORT_SYMBOL(pfnnid_map);
 #endif
 
+#ifdef CONFIG_FUNCTION_TRACER
+extern void _mcount(void);
+EXPORT_SYMBOL(_mcount);
+#endif
+
 /* from pacache.S -- needed for copy_page */
 EXPORT_SYMBOL(copy_user_page_asm);

arch/parisc/kernel/process.c

@@ -46,14 +46,15 @@
 #include <linux/stddef.h>
 #include <linux/unistd.h>
 #include <linux/kallsyms.h>
+#include <linux/uaccess.h>
 
 #include <asm/io.h>
 #include <asm/asm-offsets.h>
 #include <asm/pdc.h>
 #include <asm/pdc_chassis.h>
 #include <asm/pgalloc.h>
-#include <asm/uaccess.h>
 #include <asm/unwind.h>
+#include <asm/sections.h>
 
 /*
  * The idle thread. There's no useful work to be
@@ -231,8 +232,8 @@ sys_clone(unsigned long clone_flags, unsigned long usp,
 	   
 	   However, these last 3 args are only examined
 	   if the proper flags are set. */
-	int __user *child_tidptr;
-	int __user *parent_tidptr;
+	int __user *parent_tidptr = (int __user *)regs->gr[24];
+	int __user *child_tidptr  = (int __user *)regs->gr[22];
 
 	/* usp must be word aligned.  This also prevents users from
 	 * passing in the value 1 (which is the signal for a special
@@ -243,16 +244,6 @@ sys_clone(unsigned long clone_flags, unsigned long usp,
 	if (usp == 0)
 	  usp = regs->gr[30];
 
-	if (clone_flags & CLONE_PARENT_SETTID)
-	  parent_tidptr = (int __user *)regs->gr[24];
-	else
-	  parent_tidptr = NULL;
-	
-	if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID))
-	  child_tidptr = (int __user *)regs->gr[22];
-	else
-	  child_tidptr = NULL;
-
 	return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr);
 }
 
@@ -400,3 +391,15 @@ get_wchan(struct task_struct *p)
 	} while (count++ < 16);
 	return 0;
 }
+
+#ifdef CONFIG_64BIT
+void *dereference_function_descriptor(void *ptr)
+{
+	Elf64_Fdesc *desc = ptr;
+	void *p;
+
+	if (!probe_kernel_address(&desc->addr, p))
+		ptr = p;
+	return ptr;
+}
+#endif

arch/parisc/kernel/processor.c

@@ -100,8 +100,8 @@ static int __cpuinit processor_probe(struct parisc_device *dev)
 	struct cpuinfo_parisc *p;
 
 #ifdef CONFIG_SMP
-	if (num_online_cpus() >= NR_CPUS) {
-		printk(KERN_INFO "num_online_cpus() >= NR_CPUS\n");
+	if (num_online_cpus() >= nr_cpu_ids) {
+		printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
 		return 1;
 	}
 #else
@@ -214,7 +214,7 @@ static int __cpuinit processor_probe(struct parisc_device *dev)
 	 */
 #ifdef CONFIG_SMP
 	if (cpuid) {
-		cpu_set(cpuid, cpu_present_map);
+		set_cpu_present(cpuid, true);
 		cpu_up(cpuid);
 	}
 #endif
@@ -364,6 +364,13 @@ show_cpuinfo (struct seq_file *m, void *v)
 				 boot_cpu_data.cpu_hz / 1000000,
 				 boot_cpu_data.cpu_hz % 1000000  );
 
+		seq_printf(m, "capabilities\t:");
+		if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
+			seq_printf(m, " os32");
+		if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
+			seq_printf(m, " os64");
+		seq_printf(m, "\n");
+
 		seq_printf(m, "model\t\t: %s\n"
 				"model name\t: %s\n",
 				 boot_cpu_data.pdc.sys_model_name,

arch/parisc/kernel/smp.c

@@ -31,6 +31,7 @@
 #include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/bitops.h>
+#include <linux/ftrace.h>
 
 #include <asm/system.h>
 #include <asm/atomic.h>
@@ -113,14 +114,14 @@ halt_processor(void)
 {
 	/* REVISIT : redirect I/O Interrupts to another CPU? */
 	/* REVISIT : does PM *know* this CPU isn't available? */
-	cpu_clear(smp_processor_id(), cpu_online_map);
+	set_cpu_online(smp_processor_id(), false);
 	local_irq_disable();
 	for (;;)
 		;
 }
 
 
-irqreturn_t
+irqreturn_t __irq_entry
 ipi_interrupt(int irq, void *dev_id) 
 {
 	int this_cpu = smp_processor_id();
@@ -214,11 +215,11 @@ ipi_send(int cpu, enum ipi_message_type op)
 }
 
 static void
-send_IPI_mask(cpumask_t mask, enum ipi_message_type op)
+send_IPI_mask(const struct cpumask *mask, enum ipi_message_type op)
 {
 	int cpu;
 
-	for_each_cpu_mask(cpu, mask)
+	for_each_cpu(cpu, mask)
 		ipi_send(cpu, op);
 }
 
@@ -257,7 +258,7 @@ smp_send_all_nop(void)
 	send_IPI_allbutself(IPI_NOP);
 }
 
-void arch_send_call_function_ipi(cpumask_t mask)
+void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 {
 	send_IPI_mask(mask, IPI_CALL_FUNC);
 }
@@ -296,13 +297,14 @@ smp_cpu_init(int cpunum)
 	mb();
 
 	/* Well, support 2.4 linux scheme as well. */
-	if (cpu_test_and_set(cpunum, cpu_online_map))
+	if (cpu_isset(cpunum, cpu_online_map))
 	{
 		extern void machine_halt(void); /* arch/parisc.../process.c */
 
 		printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
 		machine_halt();
 	}  
+	set_cpu_online(cpunum, true);
 
 	/* Initialise the idle task for this CPU */
 	atomic_inc(&init_mm.mm_count);
@@ -424,8 +426,8 @@ void __init smp_prepare_boot_cpu(void)
 	/* Setup BSP mappings */
 	printk(KERN_INFO "SMP: bootstrap CPU ID is %d\n", bootstrap_processor);
 
-	cpu_set(bootstrap_processor, cpu_online_map);
-	cpu_set(bootstrap_processor, cpu_present_map);
+	set_cpu_online(bootstrap_processor, true);
+	set_cpu_present(bootstrap_processor, true);
 }
 
 
@@ -436,8 +438,7 @@ void __init smp_prepare_boot_cpu(void)
 */
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
-	cpus_clear(cpu_present_map);
-	cpu_set(0, cpu_present_map);
+	init_cpu_present(cpumask_of(0));
 
 	parisc_max_cpus = max_cpus;
 	if (!max_cpus)

arch/parisc/kernel/stacktrace.c

@@ -0,0 +1,63 @@
+/*
+ * Stack trace management functions
+ *
+ *  Copyright (C) 2009 Helge Deller <deller@gmx.de>
+ *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
+ *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
+ *
+ *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
+ */
+#include <linux/module.h>
+#include <linux/stacktrace.h>
+
+#include <asm/unwind.h>
+
+static void dump_trace(struct task_struct *task, struct stack_trace *trace)
+{
+	struct unwind_frame_info info;
+
+	/* initialize unwind info */
+	if (task == current) {
+		unsigned long sp;
+		struct pt_regs r;
+HERE:
+		asm volatile ("copy %%r30, %0" : "=r"(sp));
+		memset(&r, 0, sizeof(struct pt_regs));
+		r.iaoq[0] = (unsigned long)&&HERE;
+		r.gr[2] = (unsigned long)__builtin_return_address(0);
+		r.gr[30] = sp;
+		unwind_frame_init(&info, task, &r);
+	} else {
+		unwind_frame_init_from_blocked_task(&info, task);
+	}
+
+	/* unwind stack and save entries in stack_trace struct */
+	trace->nr_entries = 0;
+	while (trace->nr_entries < trace->max_entries) {
+		if (unwind_once(&info) < 0 || info.ip == 0)
+			break;
+
+		if (__kernel_text_address(info.ip))
+			trace->entries[trace->nr_entries++] = info.ip;
+	}
+}
+
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ */
+void save_stack_trace(struct stack_trace *trace)
+{
+	dump_trace(current, trace);
+	if (trace->nr_entries < trace->max_entries)
+		trace->entries[trace->nr_entries++] = ULONG_MAX;
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+	dump_trace(tsk, trace);
+	if (trace->nr_entries < trace->max_entries)
+		trace->entries[trace->nr_entries++] = ULONG_MAX;
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);

arch/parisc/kernel/syscall.S

@@ -365,17 +365,51 @@ tracesys_sigexit:
 
 
 	/*********************************************************
-		Light-weight-syscall code
+		32/64-bit Light-Weight-Syscall ABI
 
-		r20 - lws number
-		r26,r25,r24,r23,r22 - Input registers
-		r28 - Function return register
-		r21 - Error code.
+		* - Indicates a hint for userspace inline asm
+		implementations.
 
-		Scracth: Any of the above that aren't being
-		currently used, including r1. 
+		Syscall number (caller-saves)
+	        - %r20
+	        * In asm clobber.
 
-		Return pointer: r31 (Not usable)
+		Argument registers (caller-saves)
+	        - %r26, %r25, %r24, %r23, %r22
+	        * In asm input.
+
+		Return registers (caller-saves)
+	        - %r28 (return), %r21 (errno)
+	        * In asm output.
+
+		Caller-saves registers
+	        - %r1, %r27, %r29
+	        - %r2 (return pointer)
+	        - %r31 (ble link register)
+	        * In asm clobber.
+
+		Callee-saves registers
+	        - %r3-%r18
+	        - %r30 (stack pointer)
+	        * Not in asm clobber.
+
+		If userspace is 32-bit:
+		Callee-saves registers
+	        - %r19 (32-bit PIC register)
+
+		Differences from 32-bit calling convention:
+		- Syscall number in %r20
+		- Additional argument register %r22 (arg4)
+		- Callee-saves %r19.
+
+		If userspace is 64-bit:
+		Callee-saves registers
+		- %r27 (64-bit PIC register)
+
+		Differences from 64-bit calling convention:
+		- Syscall number in %r20
+		- Additional argument register %r22 (arg4)
+		- Callee-saves %r27.
 
 		Error codes returned by entry path:
 
@@ -473,7 +507,8 @@ lws_compare_and_swap64:
 	b,n	lws_compare_and_swap
 #else
 	/* If we are not a 64-bit kernel, then we don't
-	 * implement having 64-bit input registers
+	 * have 64-bit input registers, and calling
+	 * the 64-bit LWS CAS returns ENOSYS.
 	 */
 	b,n	lws_exit_nosys
 #endif
@@ -635,12 +670,15 @@ END(sys_call_table64)
 	/*
 		All light-weight-syscall atomic operations 
 		will use this set of locks 
+
+		NOTE: The lws_lock_start symbol must be
+		at least 16-byte aligned for safe use
+		with ldcw.
 	*/
 	.section .data
 	.align	PAGE_SIZE
 ENTRY(lws_lock_start)
 	/* lws locks */
-	.align 16
 	.rept 16
 	/* Keep locks aligned at 16-bytes */
 	.word 1

arch/parisc/kernel/time.c

@@ -24,6 +24,7 @@
 #include <linux/profile.h>
 #include <linux/clocksource.h>
 #include <linux/platform_device.h>
+#include <linux/ftrace.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -53,7 +54,7 @@ static unsigned long clocktick __read_mostly;	/* timer cycles per tick */
  * held off for an arbitrarily long period of time by interrupts being
  * disabled, so we may miss one or more ticks.
  */
-irqreturn_t timer_interrupt(int irq, void *dev_id)
+irqreturn_t __irq_entry timer_interrupt(int irq, void *dev_id)
 {
 	unsigned long now;
 	unsigned long next_tick;

arch/parisc/kernel/traps.c

@@ -247,6 +247,8 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
 
 	oops_in_progress = 1;
 
+	oops_enter();
+
 	/* Amuse the user in a SPARC fashion */
 	if (err) printk(
 KERN_CRIT "      _______________________________ \n"
@@ -293,6 +295,7 @@ KERN_CRIT "                     ||     ||\n");
 		panic("Fatal exception");
 	}
 
+	oops_exit();
 	do_exit(SIGSEGV);
 }
 
@@ -494,7 +497,7 @@ void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long o
 	panic(msg);
 }
 
-void handle_interruption(int code, struct pt_regs *regs)
+void notrace handle_interruption(int code, struct pt_regs *regs)
 {
 	unsigned long fault_address = 0;
 	unsigned long fault_space = 0;

arch/parisc/kernel/vmlinux.lds.S

@@ -54,6 +54,8 @@ SECTIONS
 		TEXT_TEXT
 		SCHED_TEXT
 		LOCK_TEXT
+		KPROBES_TEXT
+		IRQENTRY_TEXT
 		*(.text.do_softirq)
 		*(.text.sys_exit)
 		*(.text.do_sigaltstack)