linux-kernel - [PATCH 2/7] tracing: Change strlen to sizeof for hist trigger static strings

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Message-Id: <e3e754f2bd18e56eaa8baf79bee619316ebf4cfc.1545161087.git.tom.zanussi@linux.intel.com>
Date:   Tue, 18 Dec 2018 14:33:21 -0600
From:   Tom Zanussi <zanussi@...nel.org>
To:     rostedt@...dmis.org
Cc:     tglx@...utronix.de, mhiramat@...nel.org, namhyung@...nel.org,
        vedang.patel@...el.com, bigeasy@...utronix.de,
        joel@...lfernandes.org, mathieu.desnoyers@...icios.com,
        julia@...com, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org
Subject: [PATCH 2/7] tracing: Change strlen to sizeof for hist trigger static strings

From: Tom Zanussi <tom.zanussi@...ux.intel.com>

There's no need to use strlen() for static strings when the length is
already known, so update trace_events_hist.c with sizeof() for those
cases.

Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
---
 kernel/trace/trace_events_hist.c | 38 +++++++++++++++++++-------------------
 1 file changed, 19 insertions(+), 19 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index d29bf8a8e1dd..25d06b3ae1f6 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -507,7 +507,7 @@ static int synth_field_string_size(char *type)
 	start = strstr(type, "char[");
 	if (start == NULL)
 		return -EINVAL;
-	start += strlen("char[");
+	start += sizeof("char[") - 1;
 
 	end = strchr(type, ']');
 	if (!end || end < start)
@@ -1843,8 +1843,8 @@ static int parse_action(char *str, struct hist_trigger_attrs *attrs)
 	if (attrs->n_actions >= HIST_ACTIONS_MAX)
 		return ret;
 
-	if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0) ||
-	    (strncmp(str, "onmax(", strlen("onmax(")) == 0)) {
+	if ((strncmp(str, "onmatch(", sizeof("onmatch(") - 1) == 0) ||
+	    (strncmp(str, "onmax(", sizeof("onmax(") - 1) == 0)) {
 		attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
 		if (!attrs->action_str[attrs->n_actions]) {
 			ret = -ENOMEM;
@@ -1861,34 +1861,34 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
 {
 	int ret = 0;
 
-	if ((strncmp(str, "key=", strlen("key=")) == 0) ||
-	    (strncmp(str, "keys=", strlen("keys=")) == 0)) {
+	if ((strncmp(str, "key=", sizeof("key=") - 1) == 0) ||
+	    (strncmp(str, "keys=", sizeof("keys=") - 1) == 0)) {
 		attrs->keys_str = kstrdup(str, GFP_KERNEL);
 		if (!attrs->keys_str) {
 			ret = -ENOMEM;
 			goto out;
 		}
-	} else if ((strncmp(str, "val=", strlen("val=")) == 0) ||
-		 (strncmp(str, "vals=", strlen("vals=")) == 0) ||
-		 (strncmp(str, "values=", strlen("values=")) == 0)) {
+	} else if ((strncmp(str, "val=", sizeof("val=") - 1) == 0) ||
+		 (strncmp(str, "vals=", sizeof("vals=") - 1) == 0) ||
+		 (strncmp(str, "values=", sizeof("values=") - 1) == 0)) {
 		attrs->vals_str = kstrdup(str, GFP_KERNEL);
 		if (!attrs->vals_str) {
 			ret = -ENOMEM;
 			goto out;
 		}
-	} else if (strncmp(str, "sort=", strlen("sort=")) == 0) {
+	} else if (strncmp(str, "sort=", sizeof("sort=") - 1) == 0) {
 		attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
 		if (!attrs->sort_key_str) {
 			ret = -ENOMEM;
 			goto out;
 		}
-	} else if (strncmp(str, "name=", strlen("name=")) == 0) {
+	} else if (strncmp(str, "name=", sizeof("name=") - 1) == 0) {
 		attrs->name = kstrdup(str, GFP_KERNEL);
 		if (!attrs->name) {
 			ret = -ENOMEM;
 			goto out;
 		}
-	} else if (strncmp(str, "clock=", strlen("clock=")) == 0) {
+	} else if (strncmp(str, "clock=", sizeof("clock=") - 1) == 0) {
 		strsep(&str, "=");
 		if (!str) {
 			ret = -EINVAL;
@@ -1901,7 +1901,7 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
 			ret = -ENOMEM;
 			goto out;
 		}
-	} else if (strncmp(str, "size=", strlen("size=")) == 0) {
+	} else if (strncmp(str, "size=", sizeof("size=") - 1) == 0) {
 		int map_bits = parse_map_size(str);
 
 		if (map_bits < 0) {
@@ -3497,7 +3497,7 @@ static struct action_data *onmax_parse(char *str)
 	if (!onmax_fn_name || !str)
 		goto free;
 
-	if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) {
+	if (strncmp(onmax_fn_name, "save", sizeof("save") - 1) == 0) {
 		char *params = strsep(&str, ")");
 
 		if (!params) {
@@ -4302,8 +4302,8 @@ static int parse_actions(struct hist_trigger_data *hist_data)
 	for (i = 0; i < hist_data->attrs->n_actions; i++) {
 		str = hist_data->attrs->action_str[i];
 
-		if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) {
-			char *action_str = str + strlen("onmatch(");
+		if (strncmp(str, "onmatch(", sizeof("onmatch(") - 1) == 0) {
+			char *action_str = str + sizeof("onmatch(") - 1;
 
 			data = onmatch_parse(tr, action_str);
 			if (IS_ERR(data)) {
@@ -4311,8 +4311,8 @@ static int parse_actions(struct hist_trigger_data *hist_data)
 				break;
 			}
 			data->fn = action_trace;
-		} else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) {
-			char *action_str = str + strlen("onmax(");
+		} else if (strncmp(str, "onmax(", sizeof("onmax(") - 1) == 0) {
+			char *action_str = str + sizeof("onmax(") - 1;
 
 			data = onmax_parse(action_str);
 			if (IS_ERR(data)) {
@@ -5548,9 +5548,9 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
 			p++;
 			continue;
 		}
-		if (p >= param + strlen(param) - strlen("if") - 1)
+		if (p >= param + strlen(param) - (sizeof("if") - 1) - 1)
 			return -EINVAL;
-		if (*(p + strlen("if")) != ' ' && *(p + strlen("if")) != '\t') {
+		if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
 			p++;
 			continue;
 		}
-- 
2.14.1