mm: hugetlb: fix hugepage memory leak caused by wrong reserve count
[linux/fpc-iii.git] / arch / sparc / kernel / stacktrace.c
blobe78386a0029f6972a9d18979c0bfc3ea296b89f8
1 #include <linux/sched.h>
2 #include <linux/stacktrace.h>
3 #include <linux/thread_info.h>
4 #include <linux/ftrace.h>
5 #include <linux/export.h>
6 #include <asm/ptrace.h>
7 #include <asm/stacktrace.h>
9 #include "kstack.h"
11 static void __save_stack_trace(struct thread_info *tp,
12 struct stack_trace *trace,
13 bool skip_sched)
15 unsigned long ksp, fp;
16 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
17 struct task_struct *t;
18 int graph = 0;
19 #endif
21 if (tp == current_thread_info()) {
22 stack_trace_flush();
23 __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
24 } else {
25 ksp = tp->ksp;
28 fp = ksp + STACK_BIAS;
29 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
30 t = tp->task;
31 #endif
32 do {
33 struct sparc_stackf *sf;
34 struct pt_regs *regs;
35 unsigned long pc;
37 if (!kstack_valid(tp, fp))
38 break;
40 sf = (struct sparc_stackf *) fp;
41 regs = (struct pt_regs *) (sf + 1);
43 if (kstack_is_trap_frame(tp, regs)) {
44 if (!(regs->tstate & TSTATE_PRIV))
45 break;
46 pc = regs->tpc;
47 fp = regs->u_regs[UREG_I6] + STACK_BIAS;
48 } else {
49 pc = sf->callers_pc;
50 fp = (unsigned long)sf->fp + STACK_BIAS;
53 if (trace->skip > 0)
54 trace->skip--;
55 else if (!skip_sched || !in_sched_functions(pc)) {
56 trace->entries[trace->nr_entries++] = pc;
57 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
58 if ((pc + 8UL) == (unsigned long) &return_to_handler) {
59 int index = t->curr_ret_stack;
60 if (t->ret_stack && index >= graph) {
61 pc = t->ret_stack[index - graph].ret;
62 if (trace->nr_entries <
63 trace->max_entries)
64 trace->entries[trace->nr_entries++] = pc;
65 graph++;
68 #endif
70 } while (trace->nr_entries < trace->max_entries);
73 void save_stack_trace(struct stack_trace *trace)
75 __save_stack_trace(current_thread_info(), trace, false);
77 EXPORT_SYMBOL_GPL(save_stack_trace);
79 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
81 struct thread_info *tp = task_thread_info(tsk);
83 __save_stack_trace(tp, trace, true);
85 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);