From: Arnd Bergmann on
The default for llseek will change to no_llseek,
so the tracing debugfs files need to add explicit
..llseek assignments. Since we're dealing with regular
files from a VFS perspective, use generic_file_llseek.

Signed-off-by: Arnd Bergmann <arnd(a)arndb.de>
Cc: Steven Rostedt <rostedt(a)goodmis.org>
Cc: Frederic Weisbecker <fweisbec(a)gmail.com>
Cc: Ingo Molnar <mingo(a)redhat.com>
---
kernel/trace/trace.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 086d363..de3d6b3 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2394,6 +2394,7 @@ static const struct file_operations show_traces_fops = {
.open = show_traces_open,
.read = seq_read,
.release = seq_release,
+ .llseek = seq_lseek,
};

/*
@@ -2487,6 +2488,7 @@ static const struct file_operations tracing_cpumask_fops = {
.open = tracing_open_generic,
.read = tracing_cpumask_read,
.write = tracing_cpumask_write,
+ .llseek = generic_file_llseek,
};

static int tracing_trace_options_show(struct seq_file *m, void *v)
@@ -2653,6 +2655,7 @@ tracing_readme_read(struct file *filp, char __user *ubuf,
static const struct file_operations tracing_readme_fops = {
.open = tracing_open_generic,
.read = tracing_readme_read,
+ .llseek = generic_file_llseek,
};

static ssize_t
@@ -2703,6 +2706,7 @@ tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
static const struct file_operations tracing_saved_cmdlines_fops = {
.open = tracing_open_generic,
.read = tracing_saved_cmdlines_read,
+ .llseek = generic_file_llseek,
};

static ssize_t
@@ -3032,6 +3036,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
if (iter->trace->pipe_open)
iter->trace->pipe_open(iter);

+ nonseekable_open(inode, filp);
out:
mutex_unlock(&trace_types_lock);
return ret;
@@ -3590,18 +3595,21 @@ static const struct file_operations tracing_max_lat_fops = {
.open = tracing_open_generic,
.read = tracing_max_lat_read,
.write = tracing_max_lat_write,
+ .llseek = generic_file_llseek,
};

static const struct file_operations tracing_ctrl_fops = {
.open = tracing_open_generic,
.read = tracing_ctrl_read,
.write = tracing_ctrl_write,
+ .llseek = generic_file_llseek,
};

static const struct file_operations set_tracer_fops = {
.open = tracing_open_generic,
.read = tracing_set_trace_read,
.write = tracing_set_trace_write,
+ .llseek = generic_file_llseek,
};

static const struct file_operations tracing_pipe_fops = {
@@ -3610,17 +3618,20 @@ static const struct file_operations tracing_pipe_fops = {
.read = tracing_read_pipe,
.splice_read = tracing_splice_read_pipe,
.release = tracing_release_pipe,
+ .llseek = no_llseek,
};

static const struct file_operations tracing_entries_fops = {
.open = tracing_open_generic,
.read = tracing_entries_read,
.write = tracing_entries_write,
+ .llseek = generic_file_llseek,
};

static const struct file_operations tracing_mark_fops = {
.open = tracing_open_generic,
.write = tracing_mark_write,
+ .llseek = generic_file_llseek,
};

static const struct file_operations trace_clock_fops = {
@@ -3926,6 +3937,7 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
static const struct file_operations tracing_stats_fops = {
.open = tracing_open_generic,
.read = tracing_stats_read,
+ .llseek = generic_file_llseek,
};

#ifdef CONFIG_DYNAMIC_FTRACE
@@ -3962,6 +3974,7 @@ tracing_read_dyn_info(struct file *filp, char __user *ubuf,
static const struct file_operations tracing_dyn_info_fops = {
.open = tracing_open_generic,
.read = tracing_read_dyn_info,
+ .llseek = generic_file_llseek,
};
#endif

@@ -4115,6 +4128,7 @@ static const struct file_operations trace_options_fops = {
.open = tracing_open_generic,
.read = trace_options_read,
.write = trace_options_write,
+ .llseek = generic_file_llseek,
};

static ssize_t
@@ -4166,6 +4180,7 @@ static const struct file_operations trace_options_core_fops = {
.open = tracing_open_generic,
.read = trace_options_core_read,
.write = trace_options_core_write,
+ .llseek = generic_file_llseek,
};

struct dentry *trace_create_file(const char *name,
--
1.7.1

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