linux-kernel - [PATCH v3 10/12] tracing: Change trace_boot to use kprobe

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Message-Id: <a96424e4849ef2f1bd3f74e86a46c517724dc8c6.1579904761.git.zanussi@kernel.org>
Date:   Fri, 24 Jan 2020 16:56:21 -0600
From:   Tom Zanussi <zanussi@...nel.org>
To:     rostedt@...dmis.org
Cc:     artem.bityutskiy@...ux.intel.com, mhiramat@...nel.org,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        ndesaulniers@...gle.com
Subject: [PATCH v3 10/12] tracing: Change trace_boot to use kprobe_event interface

Have trace_boot_add_kprobe_event() use the kprobe_event interface.

Also, rename kprobe_event_run_cmd() to kprobe_event_run_command() now
that trace_boot's version is gone.

Signed-off-by: Tom Zanussi <zanussi@...nel.org>
---
 kernel/trace/trace_boot.c   | 35 +++++++++++++++--------------------
 kernel/trace/trace_kprobe.c |  9 ++-------
 2 files changed, 17 insertions(+), 27 deletions(-)

diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 33665718008c..76ffa8e198ff 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -91,37 +91,32 @@ trace_boot_enable_events(struct trace_array *tr, struct xbc_node *node)
 }
 
 #ifdef CONFIG_KPROBE_EVENTS
-extern int trace_kprobe_run_command(const char *command);
-
 static int __init
 trace_boot_add_kprobe_event(struct xbc_node *node, const char *event)
 {
+	struct dynevent_cmd cmd;
 	struct xbc_node *anode;
 	char buf[MAX_BUF_LEN];
 	const char *val;
-	char *p;
-	int len;
+	int ret;
 
-	len = snprintf(buf, ARRAY_SIZE(buf) - 1, "p:kprobes/%s ", event);
-	if (len >= ARRAY_SIZE(buf)) {
-		pr_err("Event name is too long: %s\n", event);
-		return -E2BIG;
-	}
-	p = buf + len;
-	len = ARRAY_SIZE(buf) - len;
+	kprobe_event_cmd_init(&cmd, buf, MAX_BUF_LEN);
+
+	ret = kprobe_event_gen_cmd_start(&cmd, event, NULL);
+	if (ret)
+		return ret;
 
 	xbc_node_for_each_array_value(node, "probes", anode, val) {
-		if (strlcpy(p, val, len) >= len) {
-			pr_err("Probe definition is too long: %s\n", val);
-			return -E2BIG;
-		}
-		if (trace_kprobe_run_command(buf) < 0) {
-			pr_err("Failed to add probe: %s\n", buf);
-			return -EINVAL;
-		}
+		ret = kprobe_event_add_field(&cmd, val);
+		if (ret)
+			return ret;
 	}
 
-	return 0;
+	ret = kprobe_event_gen_cmd_end(&cmd);
+	if (ret)
+		pr_err("Failed to add probe: %s\n", buf);
+
+	return ret;
 }
 #else
 static inline int __init
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index f43548b466d0..307abb724a71 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -901,12 +901,7 @@ static int create_or_delete_trace_kprobe(int argc, char **argv)
 	return ret == -ECANCELED ? -EINVAL : ret;
 }
 
-int trace_kprobe_run_command(const char *command)
-{
-	return trace_run_command(command, create_or_delete_trace_kprobe);
-}
-
-static int trace_kprobe_run_cmd(struct dynevent_cmd *cmd)
+static int trace_kprobe_run_command(struct dynevent_cmd *cmd)
 {
 	return trace_run_command(cmd->buf, create_or_delete_trace_kprobe);
 }
@@ -923,7 +918,7 @@ static int trace_kprobe_run_cmd(struct dynevent_cmd *cmd)
 void kprobe_event_cmd_init(struct dynevent_cmd *cmd, char *buf, int maxlen)
 {
 	dynevent_cmd_init(cmd, buf, maxlen, DYNEVENT_TYPE_KPROBE,
-			  trace_kprobe_run_cmd);
+			  trace_kprobe_run_command);
 }
 EXPORT_SYMBOL_GPL(kprobe_event_cmd_init);
 
-- 
2.14.1