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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
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