Merge branch 'tip/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...

[linux-2.6-omap-h63xx.git] / kernel / trace / ftrace.c

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index fdaab04a02824f03108d17f2d94b79518439138b..78db083390f07baa7993c48d9fc0f7a635c769d0 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -185,7 +185,6 @@ enum {
 };
 
 static int ftrace_filtered;
-static int tracing_on;
 
 static LIST_HEAD(ftrace_new_addrs);
 
@@ -499,13 +498,10 @@ static int __ftrace_modify_code(void *data)
 {
        int *command = data;
 
-       if (*command & FTRACE_ENABLE_CALLS) {
+       if (*command & FTRACE_ENABLE_CALLS)
                ftrace_replace_code(1);
-               tracing_on = 1;
-       } else if (*command & FTRACE_DISABLE_CALLS) {
+       else if (*command & FTRACE_DISABLE_CALLS)
                ftrace_replace_code(0);
-               tracing_on = 0;
-       }
 
        if (*command & FTRACE_UPDATE_TRACE_FUNC)
                ftrace_update_ftrace_func(ftrace_trace_function);
@@ -669,7 +665,7 @@ static int __init ftrace_dyn_table_alloc(unsigned long num_to_init)
 
        cnt = num_to_init / ENTRIES_PER_PAGE;
        pr_info("ftrace: allocating %ld entries in %d pages\n",
-               num_to_init, cnt);
+               num_to_init, cnt + 1);
 
        for (i = 0; i < cnt; i++) {
                pg->next = (void *)get_zeroed_page(GFP_KERNEL);
@@ -752,13 +748,11 @@ static void *t_start(struct seq_file *m, loff_t *pos)
        void *p = NULL;
        loff_t l = -1;
 
-       if (*pos != iter->pos) {
-               for (p = t_next(m, p, &l); p && l < *pos; p = t_next(m, p, &l))
-                       ;
-       } else {
-               l = *pos;
-               p = t_next(m, p, &l);
-       }
+       if (*pos > iter->pos)
+               *pos = iter->pos;
+
+       l = *pos;
+       p = t_next(m, p, &l);
 
        return p;
 }
@@ -769,15 +763,21 @@ static void t_stop(struct seq_file *m, void *p)
 
 static int t_show(struct seq_file *m, void *v)
 {
+       struct ftrace_iterator *iter = m->private;
        struct dyn_ftrace *rec = v;
        char str[KSYM_SYMBOL_LEN];
+       int ret = 0;
 
        if (!rec)
                return 0;
 
        kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
 
-       seq_printf(m, "%s\n", str);
+       ret = seq_printf(m, "%s\n", str);
+       if (ret < 0) {
+               iter->pos--;
+               iter->idx--;
+       }
 
        return 0;
 }
@@ -803,7 +803,7 @@ ftrace_avail_open(struct inode *inode, struct file *file)
                return -ENOMEM;
 
        iter->pg = ftrace_pages_start;
-       iter->pos = -1;
+       iter->pos = 0;
 
        ret = seq_open(file, &show_ftrace_seq_ops);
        if (!ret) {
@@ -890,7 +890,7 @@ ftrace_regex_open(struct inode *inode, struct file *file, int enable)
 
        if (file->f_mode & FMODE_READ) {
                iter->pg = ftrace_pages_start;
-               iter->pos = -1;
+               iter->pos = 0;
                iter->flags = enable ? FTRACE_ITER_FILTER :
                        FTRACE_ITER_NOTRACE;