These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / cris / kernel / stacktrace.c

diff --git a/kernel/arch/cris/kernel/stacktrace.c b/kernel/arch/cris/kernel/stacktrace.c
new file mode 100644 (file)
index 0000000..99838c7
--- /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 */