add preliminary Marvell Orion support

SVN-Revision: 11352

1 files changed, 82 insertions, 0 deletions

diff --git a/target/linux/orion/patches/001-latencytop_support.patch b/target/linux/orion/patches/001-latencytop_support.patch
new file mode 100644
index 0000000..a1fbc17
--- /dev/null
+++ b/target/linux/orion/patches/001-latencytop_support.patch
@@ -0,0 +1,82 @@
+From: Nicolas Pitre <nico@cam.org>
+
+Signed-off-by: Nicolas Pitre <nico@marvell.com>
+Tested-by: Lennert Buytenhek <buytenh@marvell.com>
+Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
+---
+ arch/arm/Kconfig             |    4 ++++
+ arch/arm/kernel/stacktrace.c |   26 ++++++++++++++++++++++----
+ 2 files changed, 26 insertions(+), 4 deletions(-)
+
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -84,6 +84,10 @@
+ 	bool
+ 	default y
+ 
++config HAVE_LATENCYTOP_SUPPORT
++	bool
++	default y
++
+ config LOCKDEP_SUPPORT
+ 	bool
+ 	default y
+--- a/arch/arm/kernel/stacktrace.c
++++ b/arch/arm/kernel/stacktrace.c
+@@ -36,6 +36,7 @@
+ #ifdef CONFIG_STACKTRACE
+ struct stack_trace_data {
+ 	struct stack_trace *trace;
++	unsigned int no_sched_functions;
+ 	unsigned int skip;
+ };
+ 
+@@ -43,27 +44,44 @@
+ {
+ 	struct stack_trace_data *data = d;
+ 	struct stack_trace *trace = data->trace;
++	unsigned long addr = frame->lr;
+ 
++	if (data->no_sched_functions && in_sched_functions(addr))
++		return 0;
+ 	if (data->skip) {
+ 		data->skip--;
+ 		return 0;
+ 	}
+ 
+-	trace->entries[trace->nr_entries++] = frame->lr;
++	trace->entries[trace->nr_entries++] = addr;
+ 
+ 	return trace->nr_entries >= trace->max_entries;
+ }
+ 
+-void save_stack_trace(struct stack_trace *trace)
++void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+ {
+ 	struct stack_trace_data data;
+ 	unsigned long fp, base;
+ 
+ 	data.trace = trace;
+ 	data.skip = trace->skip;
+-	base = (unsigned long)task_stack_page(current);
+-	asm("mov %0, fp" : "=r" (fp));
++	base = (unsigned long)task_stack_page(tsk);
++
++	if (tsk != current) {
++		data.no_sched_functions = 1;
++		fp = thread_saved_fp(tsk);
++	} else {
++		data.no_sched_functions = 0;
++		asm("mov %0, fp" : "=r" (fp));
++	}
+ 
+ 	walk_stackframe(fp, base, base + THREAD_SIZE, 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);
+ }
+ #endif