linux-kernel - [PATCH] tracing: Remove redundant assignment to event

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Date:   Fri,  7 May 2021 18:23:50 +0800
From:   Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
To:     rostedt@...dmis.org
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Subject: [PATCH] tracing: Remove redundant assignment to event_var

Variable event_var is set to 'ERR_PTR(-EINVAL)', but this value
is never read as it is overwritten or not used later on, hence
it is a redundant assignment and can be removed.

Clean up the following clang-analyzer warning:

kernel/trace/trace_events_hist.c:2437:21: warning: Value stored to
'event_var' during its initialization is never read
[clang-analyzer-deadcode.DeadStores].

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
---
 kernel/trace/trace_events_hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index c1abd63..b37342c 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -2434,7 +2434,7 @@ static struct trace_event_file *event_file(struct trace_array *tr,
 		      char *subsys_name, char *event_name, char *field_name)
 {
 	struct trace_array *tr = target_hist_data->event_file->tr;
-	struct hist_field *event_var = ERR_PTR(-EINVAL);
+	struct hist_field *event_var;
 	struct hist_trigger_data *hist_data;
 	unsigned int i, n, first = true;
 	struct field_var_hist *var_hist;
-- 
1.8.3.1