Commit 5a1b3999 authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
Browse files

[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: default avatarAndi Kleen <ak@suse.de>
parent 4ea8a5d8
......@@ -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)
......
......@@ -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;
}
......@@ -109,9 +109,10 @@ get_stack_end(struct task_struct *task, unsigned long stack)
* 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)
......
......@@ -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
......
......@@ -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;
......
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