[PATCH] x86: Some preparationary cleanup for stack trace

- Remove unused all_contexts parameter
No caller used it
- Move skip argument into the structure (needed for
followon patches)

Cc: mingo@elte.hu

Signed-off-by: Andi Kleen <ak@suse.de>

5 files changed, 24 insertions, 30 deletions

diff --git a/arch/i386/kernel/stacktrace.c b/arch/i386/kernel/stacktrace.c
index e62a037ab399..ae3c32a87add 100644
--- a/arch/i386/kernel/stacktrace.c
+++ b/arch/i386/kernel/stacktrace.c
@@ -61,12 +61,8 @@ save_context_stack(struct stack_trace *trace, unsigned int skip,
 
 /*
  * Save stack-backtrace addresses into a stack_trace buffer.
- * If all_contexts is set, all contexts (hardirq, softirq and process)
- * are saved. If not set then only the current context is saved.
  */
-void save_stack_trace(struct stack_trace *trace,
-                      struct task_struct *task, int all_contexts,
-                      unsigned int skip)
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
 {
         unsigned long ebp;
         unsigned long *stack = &ebp;
@@ -85,10 +81,9 @@ void save_stack_trace(struct stack_trace *trace,
                 struct thread_info *context = (struct thread_info *)
                                 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
 
-                ebp = save_context_stack(trace, skip, context, stack, ebp);
+                ebp = save_context_stack(trace, trace->skip, context, stack, ebp);
                 stack = (unsigned long *)context->previous_esp;
-                if (!all_contexts || !stack ||
-                                trace->nr_entries >= trace->max_entries)
+                if (!stack || trace->nr_entries >= trace->max_entries)
                         break;
                 trace->entries[trace->nr_entries++] = ULONG_MAX;
                 if (trace->nr_entries >= trace->max_entries)
diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
index de83f38288d0..d9428a0fc8fb 100644
--- a/arch/s390/kernel/stacktrace.c
+++ b/arch/s390/kernel/stacktrace.c
@@ -59,9 +59,7 @@ static inline unsigned long save_context_stack(struct stack_trace *trace,
         }
 }
 
-void save_stack_trace(struct stack_trace *trace,
-                      struct task_struct *task, int all_contexts,
-                      unsigned int skip)
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
 {
         register unsigned long sp asm ("15");
         unsigned long orig_sp;
@@ -69,22 +67,23 @@ void save_stack_trace(struct stack_trace *trace,
         sp &= PSW_ADDR_INSN;
         orig_sp = sp;
 
-        sp = save_context_stack(trace, &skip, sp,
+        sp = save_context_stack(trace, &trace->skip, sp,
                                 S390_lowcore.panic_stack - PAGE_SIZE,
                                 S390_lowcore.panic_stack);
-        if ((sp != orig_sp) && !all_contexts)
+        if ((sp != orig_sp) && !trace->all_contexts)
                 return;
-        sp = save_context_stack(trace, &skip, sp,
+        sp = save_context_stack(trace, &trace->skip, sp,
                                 S390_lowcore.async_stack - ASYNC_SIZE,
                                 S390_lowcore.async_stack);
-        if ((sp != orig_sp) && !all_contexts)
+        if ((sp != orig_sp) && !trace->all_contexts)
                 return;
         if (task)
-                save_context_stack(trace, &skip, sp,
+                save_context_stack(trace, &trace->skip, sp,
                                    (unsigned long) task_stack_page(task),
                                    (unsigned long) task_stack_page(task) + THREAD_SIZE);
         else
-                save_context_stack(trace, &skip, sp, S390_lowcore.thread_info,
+                save_context_stack(trace, &trace->skip, sp,
+                                   S390_lowcore.thread_info,
                                    S390_lowcore.thread_info + THREAD_SIZE);
         return;
 }
diff --git a/arch/x86_64/kernel/stacktrace.c b/arch/x86_64/kernel/stacktrace.c
index 32cf55eb9af8..1c022af8fe1e 100644
--- a/arch/x86_64/kernel/stacktrace.c
+++ b/arch/x86_64/kernel/stacktrace.c
@@ -109,9 +109,10 @@ out_restore:
  * Save stack-backtrace addresses into a stack_trace buffer:
  */
 static inline unsigned long
-save_context_stack(struct stack_trace *trace, unsigned int skip,
+save_context_stack(struct stack_trace *trace,
                    unsigned long stack, unsigned long stack_end)
 {
+        int skip = trace->skip;
         unsigned long addr;
 
 #ifdef CONFIG_FRAME_POINTER
@@ -159,12 +160,8 @@ save_context_stack(struct stack_trace *trace, unsigned int skip,
 
 /*
  * Save stack-backtrace addresses into a stack_trace buffer.
- * If all_contexts is set, all contexts (hardirq, softirq and process)
- * are saved. If not set then only the current context is saved.
  */
-void save_stack_trace(struct stack_trace *trace,
-                      struct task_struct *task, int all_contexts,
-                      unsigned int skip)
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
 {
         unsigned long stack = (unsigned long)&stack;
         int i, nr_stacks = 0, stacks_done[MAX_STACKS];
@@ -207,9 +204,8 @@ void save_stack_trace(struct stack_trace *trace,
                                 return;
                 stacks_done[nr_stacks] = stack_end;
 
-                stack = save_context_stack(trace, skip, stack, stack_end);
-                if (!all_contexts || !stack ||
-                                trace->nr_entries >= trace->max_entries)
+                stack = save_context_stack(trace, stack, stack_end);
+                if (!stack || trace->nr_entries >= trace->max_entries)
                         return;
                 trace->entries[trace->nr_entries++] = ULONG_MAX;
                 if (trace->nr_entries >= trace->max_entries)
diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
index 9cc81e572224..50e2b01e517c 100644
--- a/include/linux/stacktrace.h
+++ b/include/linux/stacktrace.h
@@ -5,15 +5,16 @@
 struct stack_trace {
         unsigned int nr_entries, max_entries;
         unsigned long *entries;
+        int skip;       /* input argument: How many entries to skip */
+        int all_contexts; /* input argument: if true do than one stack */
 };
 
 extern void save_stack_trace(struct stack_trace *trace,
-                             struct task_struct *task, int all_contexts,
-                             unsigned int skip);
+                             struct task_struct *task);
 
 extern void print_stack_trace(struct stack_trace *trace, int spaces);
 #else
-# define save_stack_trace(trace, task, all, skip)       do { } while (0)
+# define save_stack_trace(trace, task)                  do { } while (0)
 # define print_stack_trace(trace)                       do { } while (0)
 #endif
 
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 9bad17884513..900b4cb1a024 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -224,7 +224,10 @@ static int save_trace(struct stack_trace *trace)
         trace->max_entries = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries;
         trace->entries = stack_trace + nr_stack_trace_entries;
 
-        save_stack_trace(trace, NULL, 0, 3);
+        trace->skip = 3;
+        trace->all_contexts = 0;
+
+        save_stack_trace(trace, NULL);
 
         trace->max_entries = trace->nr_entries;