Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/kernel/stacktrace.c b/kernel/kernel/stacktrace.c
new file mode 100644 (file)
index 0000000..b6e4c16
--- /dev/null
+++ b/kernel/kernel/stacktrace.c
@@ -0,0 +1,75 @@
+/*
+ * kernel/stacktrace.c
+ *
+ * Stack trace management functions
+ *
+ *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ */
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/kallsyms.h>
+#include <linux/stacktrace.h>
+
+void print_stack_trace(struct stack_trace *trace, int spaces)
+{
+       int i;
+
+       if (WARN_ON(!trace->entries))
+               return;
+
+       for (i = 0; i < trace->nr_entries; i++) {
+               printk("%*c", 1 + spaces, ' ');
+               print_ip_sym(trace->entries[i]);
+       }
+}
+EXPORT_SYMBOL_GPL(print_stack_trace);
+
+int snprint_stack_trace(char *buf, size_t size,
+                       struct stack_trace *trace, int spaces)
+{
+       int i;
+       unsigned long ip;
+       int generated;
+       int total = 0;
+
+       if (WARN_ON(!trace->entries))
+               return 0;
+
+       for (i = 0; i < trace->nr_entries; i++) {
+               ip = trace->entries[i];
+               generated = snprintf(buf, size, "%*c[<%p>] %pS\n",
+                               1 + spaces, ' ', (void *) ip, (void *) ip);
+
+               total += generated;
+
+               /* Assume that generated isn't a negative number */
+               if (generated >= size) {
+                       buf += size;
+                       size = 0;
+               } else {
+                       buf += generated;
+                       size -= generated;
+               }
+       }
+
+       return total;
+}
+EXPORT_SYMBOL_GPL(snprint_stack_trace);
+
+/*
+ * Architectures that do not implement save_stack_trace_tsk or
+ * save_stack_trace_regs get this weak alias and a once-per-bootup warning
+ * (whenever this facility is utilized - for example by procfs):
+ */
+__weak void
+save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+       WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
+}
+
+__weak void
+save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
+{
+       WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.\n");
+}