linux-kernel - [PATCH 1/2] tracing/probes: Fix to return NULL and keep using current argc

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Message-ID:  <168584574094.2056209.2694238431743782342.stgit@mhiramat.roam.corp.google.com>
Date:   Sun,  4 Jun 2023 11:29:00 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     linux-trace-kernel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        mhiramat@...nel.org, Florent Revest <revest@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Will Deacon <will@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Martin KaFai Lau <martin.lau@...ux.dev>, bpf@...r.kernel.org,
        Bagas Sanjaya <bagasdotme@...il.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH 1/2] tracing/probes: Fix to return NULL and keep using current argc

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Fix to return NULL and keep using current argc when there is
$argN and the BTF is not available.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202306030940.Cej2JoUx-lkp@intel.com/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 kernel/trace/trace_probe.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index ba1c6e059b51..473e1c43bc57 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -1273,7 +1273,8 @@ const char **traceprobe_expand_meta_args(int argc, const char *argv[],
 			trace_probe_log_err(0, NOSUP_BTFARG);
 			return (const char **)params;
 		}
-		return 0;
+		*new_argc = argc;
+		return NULL;
 	}
 	ctx->params = params;
 	ctx->nr_params = nr_params;