x86: don't save unreliable stack trace entries

[sfrench/cifs-2.6.git] / arch / x86 / kernel / stacktrace.c

diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index 55771fd7e545c2875c64ad274ed8609f1298931a..c28c342c162f0a90d3ad6e50ba0fb1d5ecd132a7 100644 (file)
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -22,9 +22,11 @@ static int save_stack_stack(void *data, char *name)
        return -1;
 }
 
-static void save_stack_address(void *data, unsigned long addr)
+static void save_stack_address(void *data, unsigned long addr, int reliable)
 {
-       struct stack_trace *trace = (struct stack_trace *)data;
+       struct stack_trace *trace = data;
+       if (!reliable)
+               return;
        if (trace->skip > 0) {
                trace->skip--;
                return;
@@ -33,9 +35,12 @@ static void save_stack_address(void *data, unsigned long addr)
                trace->entries[trace->nr_entries++] = addr;
 }
 
-static void save_stack_address_nosched(void *data, unsigned long addr)
+static void
+save_stack_address_nosched(void *data, unsigned long addr, int reliable)
 {
        struct stack_trace *trace = (struct stack_trace *)data;
+       if (!reliable)
+               return;
        if (in_sched_functions(addr))
                return;
        if (trace->skip > 0) {
@@ -65,15 +70,14 @@ static const struct stacktrace_ops save_stack_ops_nosched = {
  */
 void save_stack_trace(struct stack_trace *trace)
 {
-       dump_trace(current, NULL, NULL, &save_stack_ops, trace);
+       dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace);
        if (trace->nr_entries < trace->max_entries)
                trace->entries[trace->nr_entries++] = ULONG_MAX;
 }
-EXPORT_SYMBOL(save_stack_trace);
 
 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
 {
-       dump_trace(tsk, NULL, NULL, &save_stack_ops_nosched, trace);
+       dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
        if (trace->nr_entries < trace->max_entries)
                trace->entries[trace->nr_entries++] = ULONG_MAX;
 }