10 files changed, 174 insertions, 23 deletions

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index bb28087bf818..593b56509f4f 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -7,8 +7,8 @@ AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
 # Object file lists.
 
 obj-y           := compat.o entry-armv.o entry-common.o irq.o \
-                   process.o ptrace.o semaphore.o setup.o signal.o sys_arm.o \
-                   time.o traps.o
+                   process.o ptrace.o semaphore.o setup.o signal.o \
+                   sys_arm.o stacktrace.o time.o traps.o
 
 obj-$(CONFIG_ISA_DMA_API)       += dma.o
 obj-$(CONFIG_ARCH_ACORN)        += ecard.o 
diff --git a/arch/arm/kernel/ecard.c b/arch/arm/kernel/ecard.c
index f1c0fb974177..bdbd7da99286 100644
--- a/arch/arm/kernel/ecard.c
+++ b/arch/arm/kernel/ecard.c
@@ -40,6 +40,7 @@
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
+#include <linux/kthread.h>
 
 #include <asm/dma.h>
 #include <asm/ecard.h>
@@ -50,6 +51,8 @@
 #include <asm/mach/irq.h>
 #include <asm/tlbflush.h>
 
+#include "ecard.h"
+
 #ifndef CONFIG_ARCH_RPC
 #define HAVE_EXPMASK
 #endif
@@ -123,7 +126,7 @@ static void ecard_task_reset(struct ecard_request *req)
 
         res = ec->slot_no == 8
                 ? &ec->resource[ECARD_RES_MEMC]
-                : ec->type == ECARD_EASI
+                : ec->easi
                   ? &ec->resource[ECARD_RES_EASI]
                   : &ec->resource[ECARD_RES_IOCSYNC];
 
@@ -178,7 +181,7 @@ static void ecard_task_readbytes(struct ecard_request *req)
                         index += 1;
                 }
         } else {
-                unsigned long base = (ec->type == ECARD_EASI
+                unsigned long base = (ec->easi
                          ? &ec->resource[ECARD_RES_EASI]
                          : &ec->resource[ECARD_RES_IOCSYNC])->start;
                 void __iomem *pbase = (void __iomem *)base;
@@ -263,8 +266,6 @@ static int ecard_init_mm(void)
 static int
 ecard_task(void * unused)
 {
-        daemonize("kecardd");
-
         /*
          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
          * to set page table entries where the user space would be.  Note
@@ -727,7 +728,7 @@ static int ecard_prints(char *buffer, ecard_t *ec)
         char *start = buffer;
 
         buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
-                          ec->type == ECARD_EASI ? "EASI" : "    ");
+                          ec->easi ? "EASI" : "    ");
 
         if (ec->cid.id == 0) {
                 struct in_chunk_dir incd;
@@ -814,7 +815,7 @@ static struct expansion_card *__init ecard_alloc_card(int type, int slot)
         }
 
         ec->slot_no = slot;
-        ec->type = type;
+        ec->easi = type == ECARD_EASI;
         ec->irq = NO_IRQ;
         ec->fiq = NO_IRQ;
         ec->dma = NO_DMA;
@@ -825,6 +826,7 @@ static struct expansion_card *__init ecard_alloc_card(int type, int slot)
         ec->dev.bus = &ecard_bus_type;
         ec->dev.dma_mask = &ec->dma_mask;
         ec->dma_mask = (u64)0xffffffff;
+        ec->dev.coherent_dma_mask = ec->dma_mask;
 
         if (slot < 4) {
                 ec_set_resource(ec, ECARD_RES_MEMC,
@@ -907,7 +909,7 @@ static ssize_t ecard_show_device(struct device *dev, struct device_attribute *at
 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct expansion_card *ec = ECARD_DEV(dev);
-        return sprintf(buf, "%s\n", ec->type == ECARD_EASI ? "EASI" : "IOC");
+        return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 }
 
 static struct device_attribute ecard_dev_attrs[] = {
@@ -1058,13 +1060,14 @@ ecard_probe(int slot, card_type_t type)
  */
 static int __init ecard_init(void)
 {
-        int slot, irqhw, ret;
-
-        ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL);
-        if (ret < 0) {
-                printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n",
-                       ret);
-                return ret;
+        struct task_struct *task;
+        int slot, irqhw;
+
+        task = kthread_run(ecard_task, NULL, "kecardd");
+        if (IS_ERR(task)) {
+                printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
+                       PTR_ERR(task));
+                return PTR_ERR(task);
         }
 
         printk("Probing expansion cards\n");
diff --git a/arch/arm/kernel/ecard.h b/arch/arm/kernel/ecard.h
new file mode 100644
index 000000000000..d7c2dacf935d
--- /dev/null
+++ b/arch/arm/kernel/ecard.h
@@ -0,0 +1,56 @@
+/*
+ *  ecard.h
+ *
+ *  Copyright 2007 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Definitions internal to ecard.c - for it's use only!!
+ *
+ * External expansion card header as read from the card
+ */
+struct ex_ecid {
+        unsigned char   r_irq:1;
+        unsigned char   r_zero:1;
+        unsigned char   r_fiq:1;
+        unsigned char   r_id:4;
+        unsigned char   r_a:1;
+
+        unsigned char   r_cd:1;
+        unsigned char   r_is:1;
+        unsigned char   r_w:2;
+        unsigned char   r_r1:4;
+
+        unsigned char   r_r2:8;
+
+        unsigned char   r_prod[2];
+
+        unsigned char   r_manu[2];
+
+        unsigned char   r_country;
+
+        unsigned char   r_fiqmask;
+        unsigned char   r_fiqoff[3];
+
+        unsigned char   r_irqmask;
+        unsigned char   r_irqoff[3];
+};
+
+/*
+ * Chunk directory entry as read from the card
+ */
+struct ex_chunk_dir {
+        unsigned char r_id;
+        unsigned char r_len[3];
+        unsigned long r_start;
+        union {
+                char string[256];
+                char data[1];
+        } d;
+#define c_id(x)         ((x)->r_id)
+#define c_len(x)        ((x)->r_len[0]|((x)->r_len[1]<<8)|((x)->r_len[2]<<16))
+#define c_start(x)      ((x)->r_start)
+};
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 66db0a9bf0bc..1d35edacc011 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -257,7 +257,9 @@ __create_page_tables:
          * Map some ram to cover our .data and .bss areas.
          */
         orr     r3, r7, #(KERNEL_RAM_PADDR & 0xff000000)
+        .if     (KERNEL_RAM_PADDR & 0x00f00000)
         orr     r3, r3, #(KERNEL_RAM_PADDR & 0x00f00000)
+        .endif
         add     r0, r4,  #(KERNEL_RAM_VADDR & 0xff000000) >> 18
         str     r3, [r0, #(KERNEL_RAM_VADDR & 0x00f00000) >> 18]!
         ldr     r6, =(_end - 1)
@@ -274,7 +276,9 @@ __create_page_tables:
          */
         add     r0, r4, #PAGE_OFFSET >> 18
         orr     r6, r7, #(PHYS_OFFSET & 0xff000000)
-        orr     r6, r6, #(PHYS_OFFSET & 0x00e00000)
+        .if     (PHYS_OFFSET & 0x00f00000)
+        orr     r6, r6, #(PHYS_OFFSET & 0x00f00000)
+        .endif
         str     r6, [r0]
 
 #ifdef CONFIG_DEBUG_LL
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 8afd83d0cbdd..5d6e6523598b 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -27,6 +27,7 @@
 #include <linux/cpu.h>
 #include <linux/elfcore.h>
 #include <linux/pm.h>
+#include <linux/tick.h>
 
 #include <asm/leds.h>
 #include <asm/processor.h>
@@ -159,9 +160,11 @@ void cpu_idle(void)
                 if (!idle)
                         idle = default_idle;
                 leds_event(led_idle_start);
+                tick_nohz_stop_sched_tick();
                 while (!need_resched())
                         idle();
                 leds_event(led_idle_end);
+                tick_nohz_restart_sched_tick();
                 preempt_enable_no_resched();
                 schedule();
                 preempt_disable();
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index e594b84cca83..13af4006a40f 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -779,8 +779,8 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                         break;
 
                 case PTRACE_SET_SYSCALL:
+                        task_thread_info(child)->syscall = data;
                         ret = 0;
-                        child->ptrace_message = data;
                         break;
 
 #ifdef CONFIG_CRUNCH
@@ -817,7 +817,7 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
         ip = regs->ARM_ip;
         regs->ARM_ip = why;
 
-        current->ptrace_message = scno;
+        current_thread_info()->syscall = scno;
 
         /* the 0x80 provides a way for the tracing parent to distinguish
            between a syscall stop and SIGTRAP delivery */
@@ -834,5 +834,5 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
         }
         regs->ARM_ip = ip;
 
-        return current->ptrace_message;
+        return current_thread_info()->syscall;
 }
diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c
new file mode 100644
index 000000000000..77ef35efaa8d
--- /dev/null
+++ b/arch/arm/kernel/stacktrace.c
@@ -0,0 +1,73 @@
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+
+#include "stacktrace.h"
+
+int walk_stackframe(unsigned long fp, unsigned long low, unsigned long high,
+                    int (*fn)(struct stackframe *, void *), void *data)
+{
+        struct stackframe *frame;
+
+        do {
+                /*
+                 * Check current frame pointer is within bounds
+                 */
+                if ((fp - 12) < low || fp + 4 >= high)
+                        break;
+
+                frame = (struct stackframe *)(fp - 12);
+
+                if (fn(frame, data))
+                        break;
+
+                /*
+                 * Update the low bound - the next frame must always
+                 * be at a higher address than the current frame.
+                 */
+                low = fp + 4;
+                fp = frame->fp;
+        } while (fp);
+
+        return 0;
+}
+
+#ifdef CONFIG_STACKTRACE
+struct stack_trace_data {
+        struct stack_trace *trace;
+        unsigned int skip;
+};
+
+static int save_trace(struct stackframe *frame, void *d)
+{
+        struct stack_trace_data *data = d;
+        struct stack_trace *trace = data->trace;
+
+        if (data->skip) {
+                data->skip--;
+                return 0;
+        }
+
+        trace->entries[trace->nr_entries++] = frame->lr;
+
+        return trace->nr_entries >= trace->max_entries;
+}
+
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
+{
+        struct stack_trace_data data;
+        unsigned long fp, base;
+
+        data.trace = trace;
+        data.skip = trace->skip;
+
+        if (task) {
+                base = (unsigned long)task_stack_page(task);
+                fp = 0; /* FIXME */
+        } else {
+                base = (unsigned long)task_stack_page(current);
+                asm("mov %0, fp" : "=r" (fp));
+        }
+
+        walk_stackframe(fp, base, base + THREAD_SIZE, save_trace, &data);
+}
+#endif
diff --git a/arch/arm/kernel/stacktrace.h b/arch/arm/kernel/stacktrace.h
new file mode 100644
index 000000000000..e9fd20cb5662
--- /dev/null
+++ b/arch/arm/kernel/stacktrace.h
@@ -0,0 +1,9 @@
+struct stackframe {
+        unsigned long fp;
+        unsigned long sp;
+        unsigned long lr;
+        unsigned long pc;
+};
+
+int walk_stackframe(unsigned long fp, unsigned long low, unsigned long high,
+                    int (*fn)(struct stackframe *, void *), void *data);
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index f61decb89ba2..d0540e4eaf5b 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -327,6 +327,7 @@ void restore_time_delta(struct timespec *delta, struct timespec *rtc)
 }
 EXPORT_SYMBOL(restore_time_delta);
 
+#ifndef CONFIG_GENERIC_CLOCKEVENTS
 /*
  * Kernel system timer support.
  */
@@ -340,8 +341,9 @@ void timer_tick(void)
         update_process_times(user_mode(get_irq_regs()));
 #endif
 }
+#endif
 
-#ifdef CONFIG_PM
+#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
 static int timer_suspend(struct sys_device *dev, pm_message_t state)
 {
         struct sys_timer *timer = container_of(dev, struct sys_timer, dev);
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 6055ab4b58d9..f05e66b0f868 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -286,6 +286,7 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
         struct undef_hook *hook;
         siginfo_t info;
         void __user *pc;
+        unsigned long flags;
 
         /*
          * According to the ARM ARM, PC is 2 or 4 bytes ahead,
@@ -304,7 +305,7 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
                 get_user(instr, (u32 __user *)pc);
         }
 
-        spin_lock_irq(&undef_lock);
+        spin_lock_irqsave(&undef_lock, flags);
         list_for_each_entry(hook, &undef_hook, node) {
                 if ((instr & hook->instr_mask) == hook->instr_val &&
                     (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) {
@@ -314,7 +315,7 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
                         }
                 }
         }
-        spin_unlock_irq(&undef_lock);
+        spin_unlock_irqrestore(&undef_lock, flags);
 
 #ifdef CONFIG_DEBUG_USER
         if (user_debug & UDBG_UNDEFINED) {