[PATCH 6.6 075/122] tracing: hide unused ftrace_event_id_fops

Greg Kroah-Hartman
2024-04-15T14:35:58Z

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 5281ec83454d70d98b71f1836fb16512566c01cd ]

When CONFIG_PERF_EVENTS, a 'make W=1' build produces a warning about the
unused ftrace_event_id_fops variable:

kernel/trace/trace_events.c:2155:37: error: 'ftrace_event_id_fops' defined but not used [-Werror=unused-const-variable=]
2155 | static const struct file_operations ftrace_event_id_fops = {

Hide this in the same #ifdef as the reference to it.

Link: https://lore.kernel.org/linux-trace-kernel/20240403080702.3509288-7-arnd@kernel.org

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Zheng Yejian <zhengyejian1@huawei.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ajay Kaher <akaher@vmware.com>
Cc: Jinjie Ruan <ruanjinjie@huawei.com>
Cc: Clément Léger <cleger@rivosinc.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Cc: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
Fixes: 620a30e97feb ("tracing: Don't pass file_operations array to event_create_dir()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/trace/trace_events.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 941a394d39118..99f1308122866 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1668,6 +1668,7 @@ static int trace_format_open(struct inode *inode, struct file *file)
return 0;
}

+#ifdef CONFIG_PERF_EVENTS
static ssize_t
event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
{
@@ -1682,6 +1683,7 @@ event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)

return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
}
+#endif

static ssize_t
event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
@@ -2126,10 +2128,12 @@ static const struct file_operations ftrace_event_format_fops = {
.release = seq_release,
};

+#ifdef CONFIG_PERF_EVENTS
static const struct file_operations ftrace_event_id_fops = {
.read = event_id_read,
.llseek = default_llseek,
};
+#endif

static const struct file_operations ftrace_event_filter_fops = {
.open = tracing_open_file_tr,
--
2.43.0