Commit c8961ec6 authored by Li Zefan's avatar Li Zefan Committed by Ingo Molnar
Browse files

tracing_bprintk: Don't increment @pos in t_start()

It's wrong to increment @pos in t_start(), otherwise we'll lose
some entries when reading printk_formats, if the output is larger
Reported-by: default avatarLai Jiangshan <>
Reviewed-by: default avatarLiming Wang <>
Signed-off-by: default avatarLi Zefan <>
Cc: Steven Rostedt <>
Cc: Frederic Weisbecker <>
LKML-Reference: <>
Signed-off-by: default avatarIngo Molnar <>
parent e1c7e2a6
......@@ -155,25 +155,19 @@ int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
t_start(struct seq_file *m, loff_t *pos)
const char **fmt = m->private;
const char **next = fmt;
const char **fmt = __start___trace_bprintk_fmt + *pos;
if ((unsigned long)fmt >= (unsigned long)__stop___trace_bprintk_fmt)
return NULL;
next = fmt;
m->private = ++next;
return fmt;
static void *t_start(struct seq_file *m, loff_t *pos)
static void *t_next(struct seq_file *m, void * v, loff_t *pos)
return t_next(m, NULL, pos);
return t_start(m, pos);
static int t_show(struct seq_file *m, void *v)
......@@ -224,15 +218,7 @@ static const struct seq_operations show_format_seq_ops = {
static int
ftrace_formats_open(struct inode *inode, struct file *file)
int ret;
ret = seq_open(file, &show_format_seq_ops);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = __start___trace_bprintk_fmt;
return ret;
return seq_open(file, &show_format_seq_ops);
static const struct file_operations ftrace_formats_fops = {
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