5 files changed, 82 insertions, 28 deletions

diff --git a/kernel/arch/cris/kernel/Makefile b/kernel/arch/cris/kernel/Makefile
index edef71f12..5fae398ca 100644
--- a/kernel/arch/cris/kernel/Makefile
+++ b/kernel/arch/cris/kernel/Makefile
@@ -8,6 +8,7 @@ extra-y	:= vmlinux.lds
 
 obj-y   := process.o traps.o irq.o ptrace.o setup.o time.o sys_cris.o
 obj-y += devicetree.o
+obj-y += stacktrace.o
 
 obj-$(CONFIG_MODULES)    += crisksyms.o
 obj-$(CONFIG_MODULES)	 += module.o
diff --git a/kernel/arch/cris/kernel/crisksyms.c b/kernel/arch/cris/kernel/crisksyms.c
index e704f81f8..31b4bd288 100644
--- a/kernel/arch/cris/kernel/crisksyms.c
+++ b/kernel/arch/cris/kernel/crisksyms.c
@@ -18,7 +18,6 @@
 #include <asm/pgtable.h>
 #include <asm/fasttimer.h>
 
-extern unsigned long get_cmos_time(void);
 extern void __Udiv(void);
 extern void __Umod(void);
 extern void __Div(void);
@@ -30,7 +29,6 @@ extern void __negdi2(void);
 extern void iounmap(volatile void * __iomem);
 
 /* Platform dependent support */
-EXPORT_SYMBOL(get_cmos_time);
 EXPORT_SYMBOL(loops_per_usec);
 
 /* Math functions */
diff --git a/kernel/arch/cris/kernel/irq.c b/kernel/arch/cris/kernel/irq.c
index dd0be5de5..694850e8f 100644
--- a/kernel/arch/cris/kernel/irq.c
+++ b/kernel/arch/cris/kernel/irq.c
@@ -45,7 +45,11 @@
 asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
 {
 	unsigned long sp;
-	struct pt_regs *old_regs = set_irq_regs(regs);
+	struct pt_regs *old_regs;
+
+	trace_hardirqs_off();
+
+	old_regs = set_irq_regs(regs);
 	irq_enter();
 	sp = rdsp();
 	if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
diff --git a/kernel/arch/cris/kernel/stacktrace.c b/kernel/arch/cris/kernel/stacktrace.c
new file mode 100644
index 000000000..99838c744
--- /dev/null
+++ b/kernel/arch/cris/kernel/stacktrace.c
@@ -0,0 +1,76 @@
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/stacktrace.h>
+#include <asm/stacktrace.h>
+
+void walk_stackframe(unsigned long sp,
+		     int (*fn)(unsigned long addr, void *data),
+		     void *data)
+{
+	unsigned long high = ALIGN(sp, THREAD_SIZE);
+
+	for (; sp <= high - 4; sp += 4) {
+		unsigned long addr = *(unsigned long *) sp;
+
+		if (!kernel_text_address(addr))
+			continue;
+
+		if (fn(addr, data))
+			break;
+	}
+}
+
+struct stack_trace_data {
+	struct stack_trace *trace;
+	unsigned int no_sched_functions;
+	unsigned int skip;
+};
+
+#ifdef CONFIG_STACKTRACE
+
+static int save_trace(unsigned long addr, void *d)
+{
+	struct stack_trace_data *data = d;
+	struct stack_trace *trace = data->trace;
+
+	if (data->no_sched_functions && in_sched_functions(addr))
+		return 0;
+
+	if (data->skip) {
+		data->skip--;
+		return 0;
+	}
+
+	trace->entries[trace->nr_entries++] = addr;
+
+	return trace->nr_entries >= trace->max_entries;
+}
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+	struct stack_trace_data data;
+	unsigned long sp;
+
+	data.trace = trace;
+	data.skip = trace->skip;
+
+	if (tsk != current) {
+		data.no_sched_functions = 1;
+		sp = tsk->thread.ksp;
+	} else {
+		data.no_sched_functions = 0;
+		sp = rdsp();
+	}
+
+	walk_stackframe(sp, save_trace, &data);
+	if (trace->nr_entries < trace->max_entries)
+		trace->entries[trace->nr_entries++] = ULONG_MAX;
+}
+
+void save_stack_trace(struct stack_trace *trace)
+{
+	save_stack_trace_tsk(current, trace);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+
+#endif /* CONFIG_STACKTRACE */
diff --git a/kernel/arch/cris/kernel/time.c b/kernel/arch/cris/kernel/time.c
index 7780d3795..2dda6da71 100644
--- a/kernel/arch/cris/kernel/time.c
+++ b/kernel/arch/cris/kernel/time.c
@@ -39,31 +39,6 @@
 extern unsigned long loops_per_jiffy; /* init/main.c */
 unsigned long loops_per_usec;
 
-int set_rtc_mmss(unsigned long nowtime)
-{
-	D(printk(KERN_DEBUG "set_rtc_mmss(%lu)\n", nowtime));
-	return 0;
-}
-
-/* grab the time from the RTC chip */
-unsigned long get_cmos_time(void)
-{
-	return 0;
-}
-
-
-int update_persistent_clock(struct timespec now)
-{
-	return set_rtc_mmss(now.tv_sec);
-}
-
-void read_persistent_clock(struct timespec *ts)
-{
-	ts->tv_sec = 0;
-	ts->tv_nsec = 0;
-}
-
-
 extern void cris_profile_sample(struct pt_regs* regs);
 
 void