tracing: Change strlen to sizeof for hist trigger static strings

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.

Link: http://lkml.kernel.org/r/e3e754f2bd18e56eaa8baf79bee619316ebf4cfc.1545161087.git.tom.zanussi@linux.intel.com
Acked-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index d29bf8a..25d06b3 100644 (file)
--- 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;
                }