#define MAX_ST_ENTRIES 100
static DEFINE_SPINLOCK(st_lock);
+/*
+ * Linux v5.1-rc5 214d8ca6ee ("stacktrace: Provide common infrastructure")
+ * CONFIG_ARCH_STACKWALK indicates that save_stack_trace_tsk symbol is not
+ * exported. Use symbol_get() to find if save_stack_trace_tsk is available.
+ */
+#ifdef CONFIG_ARCH_STACKWALK
+typedef unsigned int (stack_trace_save_tsk_t)(struct task_struct *task,
+ unsigned long *store, unsigned int size,
+ unsigned int skipnr);
+static stack_trace_save_tsk_t *task_dump_stack;
+#endif
+
static void libcfs_call_trace(struct task_struct *tsk)
{
+#ifdef CONFIG_ARCH_STACKWALK
+ static unsigned long entries[MAX_ST_ENTRIES];
+ unsigned int i, nr_entries;
+
+ if (!task_dump_stack)
+ task_dump_stack = (stack_trace_save_tsk_t *)
+ symbol_get("stack_trace_save_tsk");
+
+ spin_lock(&st_lock);
+ pr_info("Pid: %d, comm: %.20s %s %s\n", tsk->pid, tsk->comm,
+ init_utsname()->release, init_utsname()->version);
+ pr_info("Call Trace TBD:\n");
+ if (task_dump_stack) {
+ nr_entries = task_dump_stack(tsk, entries, MAX_ST_ENTRIES, 0);
+ for (i = 0; i < nr_entries; i++)
+ pr_info("[<0>] %pB\n", (void *)entries[i]);
+ }
+ spin_unlock(&st_lock);
+#else
struct stack_trace trace;
static unsigned long entries[MAX_ST_ENTRIES];
save_stack_trace_tsk(tsk, &trace);
print_stack_trace(&trace, 0);
spin_unlock(&st_lock);
+#endif
}
#else /* !CONFIG_STACKTRACE */