linux-kernel - [PATCH v2 2/2] trace: remove kretprobed checks

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Message-Id: <20181031152543.12138-3-cyphar@cyphar.com>
Date:   Thu,  1 Nov 2018 02:25:43 +1100
From:   Aleksa Sarai <cyphar@...har.com>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Aleksa Sarai <cyphar@...har.com>, Aleksa Sarai <asarai@...e.de>,
        Christian Brauner <christian@...uner.io>,
        Brendan Gregg <bgregg@...flix.com>, netdev@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH v2 2/2] trace: remove kretprobed checks

This is effectively a reversion of commit 76094a2cf46e ("ftrace:
distinguish kretprobe'd functions in trace logs"), as the checking of
kretprobe_trampoline *for tracing* is no longer necessary with the new
kretprobe stack trace changes.

Signed-off-by: Aleksa Sarai <cyphar@...har.com>
---
 kernel/trace/trace_output.c | 34 ++++------------------------------
 1 file changed, 4 insertions(+), 30 deletions(-)

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 6e6cc64faa38..951de16bd4fd 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -321,36 +321,14 @@ int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
 }
 EXPORT_SYMBOL_GPL(trace_output_call);
 
-#ifdef CONFIG_KRETPROBES
-static inline const char *kretprobed(const char *name)
-{
-	static const char tramp_name[] = "kretprobe_trampoline";
-	int size = sizeof(tramp_name);
-
-	if (strncmp(tramp_name, name, size) == 0)
-		return "[unknown/kretprobe'd]";
-	return name;
-}
-#else
-static inline const char *kretprobed(const char *name)
-{
-	return name;
-}
-#endif /* CONFIG_KRETPROBES */
-
 static void
 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 {
 	char str[KSYM_SYMBOL_LEN];
 #ifdef CONFIG_KALLSYMS
-	const char *name;
-
 	kallsyms_lookup(address, NULL, NULL, NULL, str);
-
-	name = kretprobed(str);
-
-	if (name && strlen(name)) {
-		trace_seq_printf(s, fmt, name);
+	if (strlen(str)) {
+		trace_seq_printf(s, fmt, str);
 		return;
 	}
 #endif
@@ -364,13 +342,9 @@ seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 {
 	char str[KSYM_SYMBOL_LEN];
 #ifdef CONFIG_KALLSYMS
-	const char *name;
-
 	sprint_symbol(str, address);
-	name = kretprobed(str);
-
-	if (name && strlen(name)) {
-		trace_seq_printf(s, fmt, name);
+	if (strlen(str)) {
+		trace_seq_printf(s, fmt, str);
 		return;
 	}
 #endif
-- 
2.19.1