tracing/stack-tracer: fix style issues
Impact: cleanup
Signed-off-by: Török Edwin <edwintorok@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index b151530..10786af 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -89,7 +89,7 @@
struct stack_frame {
const void __user *next_fp;
- unsigned long return_address;
+ unsigned long ret_addr;
};
static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
@@ -108,33 +108,40 @@
return ret;
}
+static inline void __save_stack_trace_user(struct stack_trace *trace)
+{
+ const struct pt_regs *regs = task_pt_regs(current);
+ const void __user *fp = (const void __user *)regs->bp;
+
+ if (trace->nr_entries < trace->max_entries)
+ trace->entries[trace->nr_entries++] = regs->ip;
+
+ while (trace->nr_entries < trace->max_entries) {
+ struct stack_frame frame;
+
+ frame.next_fp = NULL;
+ frame.ret_addr = 0;
+ if (!copy_stack_frame(fp, &frame))
+ break;
+ if ((unsigned long)fp < regs->sp)
+ break;
+ if (frame.ret_addr) {
+ trace->entries[trace->nr_entries++] =
+ frame.ret_addr;
+ }
+ if (fp == frame.next_fp)
+ break;
+ fp = frame.next_fp;
+ }
+}
+
void save_stack_trace_user(struct stack_trace *trace)
{
/*
* Trace user stack if we are not a kernel thread
*/
if (current->mm) {
- const struct pt_regs *regs = task_pt_regs(current);
- const void __user *fp = (const void __user *)regs->bp;
-
- if (trace->nr_entries < trace->max_entries)
- trace->entries[trace->nr_entries++] = regs->ip;
-
- while (trace->nr_entries < trace->max_entries) {
- struct stack_frame frame;
- frame.next_fp = NULL;
- frame.return_address = 0;
- if (!copy_stack_frame(fp, &frame))
- break;
- if ((unsigned long)fp < regs->sp)
- break;
- if (frame.return_address)
- trace->entries[trace->nr_entries++] =
- frame.return_address;
- if (fp == frame.next_fp)
- break;
- fp = frame.next_fp;
- }
+ __save_stack_trace_user(trace);
}
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;