linux-kernel - [for-linus][PATCH 08/10] tracing: Fix smatch warning for do while check in event_hist_trigger

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Message-ID: <20220128162344.722992572@goodmis.org>
Date:   Fri, 28 Jan 2022 11:18:10 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Tom Zanussi <zanussi@...nel.org>
Subject: [for-linus][PATCH 08/10] tracing: Fix smatch warning for do while check in
 event_hist_trigger_parse()

From: Tom Zanussi <zanussi@...nel.org>

The patch ec5ce0987541: "tracing: Allow whitespace to surround hist
trigger filter" from Jan 15, 2018, leads to the following Smatch
static checker warning:

    kernel/trace/trace_events_hist.c:6199 event_hist_trigger_parse()
    warn: 'p' can't be NULL.

Since p is always checked for a NULL value at the top of loop and
nothing in the rest of the loop will set it to NULL, the warning
is correct and might as well be 1 to silence the warning.

Link: https://lkml.kernel.org/r/a1d4c79766c0cf61e20438dc35244d216633fef6.1643319703.git.zanussi@kernel.org

Fixes: ec5ce09875410 ("tracing: Allow whitespace to surround hist trigger filter")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Tom Zanussi <zanussi@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 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 e0860146dd39..b894d68082ea 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -6199,7 +6199,7 @@ static int event_hist_trigger_parse(struct event_command *cmd_ops,
 			continue;
 		}
 		break;
-	} while (p);
+	} while (1);
 
 	if (!p)
 		param = NULL;
-- 
2.33.0