Merge branch 'for_rmk' of git://git.mnementh.co.uk/linux-2.6-im into devel

[karo-tx-linux.git] / kernel / trace / trace_stack.c

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 74c5d9a3afae790d436c5dd3135488c535ac0981..3bdb44bde4b7e5fa4af698c467f0c64b704e7699 100644 (file)
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -44,6 +44,10 @@ static inline void check_stack(void)
        if (this_size <= max_stack_size)
                return;
 
+       /* we do not handle interrupt stacks yet */
+       if (!object_is_on_stack(&this_size))
+               return;
+
        raw_local_irq_save(flags);
        __raw_spin_lock(&max_stack_lock);
 
@@ -180,11 +184,16 @@ static struct file_operations stack_max_size_fops = {
 static void *
 t_next(struct seq_file *m, void *v, loff_t *pos)
 {
-       long i = (long)m->private;
+       long i;
 
        (*pos)++;
 
-       i++;
+       if (v == SEQ_START_TOKEN)
+               i = 0;
+       else {
+               i = *(long *)v;
+               i++;
+       }
 
        if (i >= max_stack_trace.nr_entries ||
            stack_dump_trace[i] == ULONG_MAX)
@@ -197,12 +206,15 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
 
 static void *t_start(struct seq_file *m, loff_t *pos)
 {
-       void *t = &m->private;
+       void *t = SEQ_START_TOKEN;
        loff_t l = 0;
 
        local_irq_disable();
        __raw_spin_lock(&max_stack_lock);
 
+       if (*pos == 0)
+               return SEQ_START_TOKEN;
+
        for (; t && l < *pos; t = t_next(m, t, &l))
                ;
 
@@ -231,10 +243,10 @@ static int trace_lookup_stack(struct seq_file *m, long i)
 
 static int t_show(struct seq_file *m, void *v)
 {
-       long i = *(long *)v;
+       long i;
        int size;
 
-       if (i < 0) {
+       if (v == SEQ_START_TOKEN) {
                seq_printf(m, "        Depth   Size      Location"
                           "    (%d entries)\n"
                           "        -----   ----      --------\n",
@@ -242,6 +254,8 @@ static int t_show(struct seq_file *m, void *v)
                return 0;
        }
 
+       i = *(long *)v;
+
        if (i >= max_stack_trace.nr_entries ||
            stack_dump_trace[i] == ULONG_MAX)
                return 0;
@@ -271,10 +285,6 @@ static int stack_trace_open(struct inode *inode, struct file *file)
        int ret;
 
        ret = seq_open(file, &stack_trace_seq_ops);
-       if (!ret) {
-               struct seq_file *m = file->private_data;
-               m->private = (void *)-1;
-       }
 
        return ret;
 }