[2/4] tracing: Remove check_arg() callbacks from dynevent args
diff mbox series

Message ID c7708d6f177fcbe1a36b6e4e8e150907df0fa5d2.1580506712.git.zanussi@kernel.org
State New
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Series
  • [1/4] tracing: Consolidate some synth_event_trace code
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Commit Message

Tom Zanussi Jan. 31, 2020, 9:55 p.m. UTC
It's kind of strange to have check_arg() callbacks as part of the arg
objects themselves; it makes more sense to just pass these in when the
args are added instead.

Remove the check_arg() callbacks from those objects which also means
removing the check_arg() args from the init functions, adding them to
the add functions and fixing up existing callers.

Signed-off-by: Tom Zanussi <zanussi@kernel.org>
---
 kernel/trace/trace_dynevent.c    | 62 ++++++++++++++++++----------------------
 kernel/trace/trace_dynevent.h    | 11 ++++---
 kernel/trace/trace_events_hist.c | 16 +++++------
 kernel/trace/trace_kprobe.c      | 10 +++----
 4 files changed, 46 insertions(+), 53 deletions(-)

Comments

Masami Hiramatsu Feb. 1, 2020, 7:28 a.m. UTC | #1
On Fri, 31 Jan 2020 15:55:32 -0600
Tom Zanussi <zanussi@kernel.org> wrote:

> It's kind of strange to have check_arg() callbacks as part of the arg
> objects themselves; it makes more sense to just pass these in when the
> args are added instead.
> 
> Remove the check_arg() callbacks from those objects which also means
> removing the check_arg() args from the init functions, adding them to
> the add functions and fixing up existing callers.

Looks good to me.

Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>

Thank you,

> 
> Signed-off-by: Tom Zanussi <zanussi@kernel.org>
> ---
>  kernel/trace/trace_dynevent.c    | 62 ++++++++++++++++++----------------------
>  kernel/trace/trace_dynevent.h    | 11 ++++---
>  kernel/trace/trace_events_hist.c | 16 +++++------
>  kernel/trace/trace_kprobe.c      | 10 +++----
>  4 files changed, 46 insertions(+), 53 deletions(-)
> 
> diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> index 6ffdbc4fda53..f9cfcdc9d1f3 100644
> --- a/kernel/trace/trace_dynevent.c
> +++ b/kernel/trace/trace_dynevent.c
> @@ -228,27 +228,30 @@ fs_initcall(init_dynamic_event);
>   * dynevent_arg_add - Add an arg to a dynevent_cmd
>   * @cmd: A pointer to the dynevent_cmd struct representing the new event cmd
>   * @arg: The argument to append to the current cmd
> + * @check_arg: An (optional) pointer to a function checking arg sanity
>   *
>   * Append an argument to a dynevent_cmd.  The argument string will be
>   * appended to the current cmd string, followed by a separator, if
> - * applicable.  Before the argument is added, the check_arg()
> - * function, if defined, is called.
> + * applicable.  Before the argument is added, the @check_arg function,
> + * if present, will be used to check the sanity of the current arg
> + * string.
>   *
> - * The cmd string, separator, and check_arg() function should be set
> - * using the dynevent_arg_init() before any arguments are added using
> - * this function.
> + * The cmd string and separator should be set using the
> + * dynevent_arg_init() before any arguments are added using this
> + * function.
>   *
>   * Return: 0 if successful, error otherwise.
>   */
>  int dynevent_arg_add(struct dynevent_cmd *cmd,
> -		     struct dynevent_arg *arg)
> +		     struct dynevent_arg *arg,
> +		     dynevent_check_arg_fn_t check_arg)
>  {
>  	int ret = 0;
>  	int delta;
>  	char *q;
>  
> -	if (arg->check_arg) {
> -		ret = arg->check_arg(arg);
> +	if (check_arg) {
> +		ret = check_arg(arg);
>  		if (ret)
>  			return ret;
>  	}
> @@ -269,6 +272,7 @@ int dynevent_arg_add(struct dynevent_cmd *cmd,
>   * dynevent_arg_pair_add - Add an arg pair to a dynevent_cmd
>   * @cmd: A pointer to the dynevent_cmd struct representing the new event cmd
>   * @arg_pair: The argument pair to append to the current cmd
> + * @check_arg: An (optional) pointer to a function checking arg sanity
>   *
>   * Append an argument pair to a dynevent_cmd.  An argument pair
>   * consists of a left-hand-side argument and a right-hand-side
> @@ -278,24 +282,26 @@ int dynevent_arg_add(struct dynevent_cmd *cmd,
>   *
>   * The lhs argument string will be appended to the current cmd string,
>   * followed by an operator, if applicable, followd by the rhs string,
> - * followed finally by a separator, if applicable.  Before anything is
> - * added, the check_arg() function, if defined, is called.
> + * followed finally by a separator, if applicable.  Before the
> + * argument is added, the @check_arg function, if present, will be
> + * used to check the sanity of the current arg strings.
>   *
> - * The cmd strings, operator, separator, and check_arg() function
> - * should be set using the dynevent_arg_pair_init() before any arguments
> - * are added using this function.
> + * The cmd strings, operator, and separator should be set using the
> + * dynevent_arg_pair_init() before any arguments are added using this
> + * function.
>   *
>   * Return: 0 if successful, error otherwise.
>   */
>  int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
> -			  struct dynevent_arg_pair *arg_pair)
> +			  struct dynevent_arg_pair *arg_pair,
> +			  dynevent_check_arg_fn_t check_arg)
>  {
>  	int ret = 0;
>  	int delta;
>  	char *q;
>  
> -	if (arg_pair->check_arg) {
> -		ret = arg_pair->check_arg(arg_pair);
> +	if (check_arg) {
> +		ret = check_arg(arg_pair);
>  		if (ret)
>  			return ret;
>  	}
> @@ -385,20 +391,16 @@ void dynevent_cmd_init(struct dynevent_cmd *cmd, char *buf, int maxlen,
>  /**
>   * dynevent_arg_init - Initialize a dynevent_arg object
>   * @arg: A pointer to the dynevent_arg struct representing the arg
> - * @check_arg: An (optional) pointer to a function checking arg sanity
>   * @separator: An (optional) separator, appended after adding the arg
>   *
>   * Initialize a dynevent_arg object.  A dynevent_arg represents an
>   * object used to append single arguments to the current command
> - * string.  The @check_arg function, if present, will be used to check
> - * the sanity of the current arg string (which is directly set by the
> - * caller).  After the arg string is successfully appended to the
> + * string.  After the arg string is successfully appended to the
>   * command string, the optional @separator is appended.  If no
>   * separator was specified when initializing the arg, a space will be
>   * appended.
>   */
>  void dynevent_arg_init(struct dynevent_arg *arg,
> -		       dynevent_check_arg_fn_t check_arg,
>  		       char separator)
>  {
>  	memset(arg, '\0', sizeof(*arg));
> @@ -406,14 +408,11 @@ void dynevent_arg_init(struct dynevent_arg *arg,
>  	if (!separator)
>  		separator = ' ';
>  	arg->separator = separator;
> -
> -	arg->check_arg = check_arg;
>  }
>  
>  /**
>   * dynevent_arg_pair_init - Initialize a dynevent_arg_pair object
>   * @arg_pair: A pointer to the dynevent_arg_pair struct representing the arg
> - * @check_arg: An (optional) pointer to a function checking arg sanity
>   * @operator: An (optional) operator, appended after adding the first arg
>   * @separator: An (optional) separator, appended after adding the second arg
>   *
> @@ -422,16 +421,13 @@ void dynevent_arg_init(struct dynevent_arg *arg,
>   * variable_name;' or 'x+y' to the current command string.  An
>   * argument pair consists of a left-hand-side argument and a
>   * right-hand-side argument separated by an operator, which can be
> - * whitespace, all followed by a separator, if applicable. The
> - * @check_arg function, if present, will be used to check the sanity
> - * of the current arg strings (which is directly set by the caller).
> - * After the first arg string is successfully appended to the command
> - * string, the optional @operator is appended, followed by the second
> - * arg and and optional @separator.  If no separator was specified
> - * when initializing the arg, a space will be appended.
> + * whitespace, all followed by a separator, if applicable.  After the
> + * first arg string is successfully appended to the command string,
> + * the optional @operator is appended, followed by the second arg and
> + * and optional @separator.  If no separator was specified when
> + * initializing the arg, a space will be appended.
>   */
>  void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
> -			    dynevent_check_arg_fn_t check_arg,
>  			    char operator, char separator)
>  {
>  	memset(arg_pair, '\0', sizeof(*arg_pair));
> @@ -443,8 +439,6 @@ void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
>  	if (!separator)
>  		separator = ' ';
>  	arg_pair->separator = separator;
> -
> -	arg_pair->check_arg = check_arg;
>  }
>  
>  /**
> diff --git a/kernel/trace/trace_dynevent.h b/kernel/trace/trace_dynevent.h
> index b593fc34c5b1..d6857a254ede 100644
> --- a/kernel/trace/trace_dynevent.h
> +++ b/kernel/trace/trace_dynevent.h
> @@ -126,28 +126,27 @@ typedef int (*dynevent_check_arg_fn_t)(void *data);
>  struct dynevent_arg {
>  	const char		*str;
>  	char			separator; /* e.g. ';', ',', or nothing */
> -	dynevent_check_arg_fn_t	check_arg;
>  };
>  
>  extern void dynevent_arg_init(struct dynevent_arg *arg,
> -			      dynevent_check_arg_fn_t check_arg,
>  			      char separator);
>  extern int dynevent_arg_add(struct dynevent_cmd *cmd,
> -			    struct dynevent_arg *arg);
> +			    struct dynevent_arg *arg,
> +			    dynevent_check_arg_fn_t check_arg);
>  
>  struct dynevent_arg_pair {
>  	const char		*lhs;
>  	const char		*rhs;
>  	char			operator; /* e.g. '=' or nothing */
>  	char			separator; /* e.g. ';', ',', or nothing */
> -	dynevent_check_arg_fn_t	check_arg;
>  };
>  
>  extern void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
> -				   dynevent_check_arg_fn_t check_arg,
>  				   char operator, char separator);
> +
>  extern int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
> -				 struct dynevent_arg_pair *arg_pair);
> +				 struct dynevent_arg_pair *arg_pair,
> +				 dynevent_check_arg_fn_t check_arg);
>  extern int dynevent_str_add(struct dynevent_cmd *cmd, const char *str);
>  
>  #endif
> diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> index 772bd3d7c29f..a566f5d290c1 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -1334,12 +1334,12 @@ int synth_event_add_field(struct dynevent_cmd *cmd, const char *type,
>  	if (!type || !name)
>  		return -EINVAL;
>  
> -	dynevent_arg_pair_init(&arg_pair, synth_event_check_arg_fn, 0, ';');
> +	dynevent_arg_pair_init(&arg_pair, 0, ';');
>  
>  	arg_pair.lhs = type;
>  	arg_pair.rhs = name;
>  
> -	ret = dynevent_arg_pair_add(cmd, &arg_pair);
> +	ret = dynevent_arg_pair_add(cmd, &arg_pair, synth_event_check_arg_fn);
>  	if (ret)
>  		return ret;
>  
> @@ -1377,11 +1377,11 @@ int synth_event_add_field_str(struct dynevent_cmd *cmd, const char *type_name)
>  	if (!type_name)
>  		return -EINVAL;
>  
> -	dynevent_arg_init(&arg, NULL, ';');
> +	dynevent_arg_init(&arg, ';');
>  
>  	arg.str = type_name;
>  
> -	ret = dynevent_arg_add(cmd, &arg);
> +	ret = dynevent_arg_add(cmd, &arg, NULL);
>  	if (ret)
>  		return ret;
>  
> @@ -1472,9 +1472,9 @@ int __synth_event_gen_cmd_start(struct dynevent_cmd *cmd, const char *name,
>  	if (cmd->type != DYNEVENT_TYPE_SYNTH)
>  		return -EINVAL;
>  
> -	dynevent_arg_init(&arg, NULL, 0);
> +	dynevent_arg_init(&arg, 0);
>  	arg.str = name;
> -	ret = dynevent_arg_add(cmd, &arg);
> +	ret = dynevent_arg_add(cmd, &arg, NULL);
>  	if (ret)
>  		return ret;
>  
> @@ -1546,9 +1546,9 @@ int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd, const char *name,
>  	if (n_fields > SYNTH_FIELDS_MAX)
>  		return -EINVAL;
>  
> -	dynevent_arg_init(&arg, NULL, 0);
> +	dynevent_arg_init(&arg, 0);
>  	arg.str = name;
> -	ret = dynevent_arg_add(cmd, &arg);
> +	ret = dynevent_arg_add(cmd, &arg, NULL);
>  	if (ret)
>  		return ret;
>  
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 307abb724a71..fe183d4045d2 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -962,9 +962,9 @@ int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
>  	if (ret)
>  		return ret;
>  
> -	dynevent_arg_init(&arg, NULL, 0);
> +	dynevent_arg_init(&arg, 0);
>  	arg.str = loc;
> -	ret = dynevent_arg_add(cmd, &arg);
> +	ret = dynevent_arg_add(cmd, &arg, NULL);
>  	if (ret)
>  		return ret;
>  
> @@ -982,7 +982,7 @@ int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
>  		}
>  
>  		arg.str = field;
> -		ret = dynevent_arg_add(cmd, &arg);
> +		ret = dynevent_arg_add(cmd, &arg, NULL);
>  		if (ret)
>  			break;
>  	}
> @@ -1017,7 +1017,7 @@ int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...)
>  	if (cmd->type != DYNEVENT_TYPE_KPROBE)
>  		return -EINVAL;
>  
> -	dynevent_arg_init(&arg, NULL, 0);
> +	dynevent_arg_init(&arg, 0);
>  
>  	va_start(args, cmd);
>  	for (;;) {
> @@ -1033,7 +1033,7 @@ int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...)
>  		}
>  
>  		arg.str = field;
> -		ret = dynevent_arg_add(cmd, &arg);
> +		ret = dynevent_arg_add(cmd, &arg, NULL);
>  		if (ret)
>  			break;
>  	}
> -- 
> 2.14.1
>

Patch
diff mbox series

diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
index 6ffdbc4fda53..f9cfcdc9d1f3 100644
--- a/kernel/trace/trace_dynevent.c
+++ b/kernel/trace/trace_dynevent.c
@@ -228,27 +228,30 @@  fs_initcall(init_dynamic_event);
  * dynevent_arg_add - Add an arg to a dynevent_cmd
  * @cmd: A pointer to the dynevent_cmd struct representing the new event cmd
  * @arg: The argument to append to the current cmd
+ * @check_arg: An (optional) pointer to a function checking arg sanity
  *
  * Append an argument to a dynevent_cmd.  The argument string will be
  * appended to the current cmd string, followed by a separator, if
- * applicable.  Before the argument is added, the check_arg()
- * function, if defined, is called.
+ * applicable.  Before the argument is added, the @check_arg function,
+ * if present, will be used to check the sanity of the current arg
+ * string.
  *
- * The cmd string, separator, and check_arg() function should be set
- * using the dynevent_arg_init() before any arguments are added using
- * this function.
+ * The cmd string and separator should be set using the
+ * dynevent_arg_init() before any arguments are added using this
+ * function.
  *
  * Return: 0 if successful, error otherwise.
  */
 int dynevent_arg_add(struct dynevent_cmd *cmd,
-		     struct dynevent_arg *arg)
+		     struct dynevent_arg *arg,
+		     dynevent_check_arg_fn_t check_arg)
 {
 	int ret = 0;
 	int delta;
 	char *q;
 
-	if (arg->check_arg) {
-		ret = arg->check_arg(arg);
+	if (check_arg) {
+		ret = check_arg(arg);
 		if (ret)
 			return ret;
 	}
@@ -269,6 +272,7 @@  int dynevent_arg_add(struct dynevent_cmd *cmd,
  * dynevent_arg_pair_add - Add an arg pair to a dynevent_cmd
  * @cmd: A pointer to the dynevent_cmd struct representing the new event cmd
  * @arg_pair: The argument pair to append to the current cmd
+ * @check_arg: An (optional) pointer to a function checking arg sanity
  *
  * Append an argument pair to a dynevent_cmd.  An argument pair
  * consists of a left-hand-side argument and a right-hand-side
@@ -278,24 +282,26 @@  int dynevent_arg_add(struct dynevent_cmd *cmd,
  *
  * The lhs argument string will be appended to the current cmd string,
  * followed by an operator, if applicable, followd by the rhs string,
- * followed finally by a separator, if applicable.  Before anything is
- * added, the check_arg() function, if defined, is called.
+ * followed finally by a separator, if applicable.  Before the
+ * argument is added, the @check_arg function, if present, will be
+ * used to check the sanity of the current arg strings.
  *
- * The cmd strings, operator, separator, and check_arg() function
- * should be set using the dynevent_arg_pair_init() before any arguments
- * are added using this function.
+ * The cmd strings, operator, and separator should be set using the
+ * dynevent_arg_pair_init() before any arguments are added using this
+ * function.
  *
  * Return: 0 if successful, error otherwise.
  */
 int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
-			  struct dynevent_arg_pair *arg_pair)
+			  struct dynevent_arg_pair *arg_pair,
+			  dynevent_check_arg_fn_t check_arg)
 {
 	int ret = 0;
 	int delta;
 	char *q;
 
-	if (arg_pair->check_arg) {
-		ret = arg_pair->check_arg(arg_pair);
+	if (check_arg) {
+		ret = check_arg(arg_pair);
 		if (ret)
 			return ret;
 	}
@@ -385,20 +391,16 @@  void dynevent_cmd_init(struct dynevent_cmd *cmd, char *buf, int maxlen,
 /**
  * dynevent_arg_init - Initialize a dynevent_arg object
  * @arg: A pointer to the dynevent_arg struct representing the arg
- * @check_arg: An (optional) pointer to a function checking arg sanity
  * @separator: An (optional) separator, appended after adding the arg
  *
  * Initialize a dynevent_arg object.  A dynevent_arg represents an
  * object used to append single arguments to the current command
- * string.  The @check_arg function, if present, will be used to check
- * the sanity of the current arg string (which is directly set by the
- * caller).  After the arg string is successfully appended to the
+ * string.  After the arg string is successfully appended to the
  * command string, the optional @separator is appended.  If no
  * separator was specified when initializing the arg, a space will be
  * appended.
  */
 void dynevent_arg_init(struct dynevent_arg *arg,
-		       dynevent_check_arg_fn_t check_arg,
 		       char separator)
 {
 	memset(arg, '\0', sizeof(*arg));
@@ -406,14 +408,11 @@  void dynevent_arg_init(struct dynevent_arg *arg,
 	if (!separator)
 		separator = ' ';
 	arg->separator = separator;
-
-	arg->check_arg = check_arg;
 }
 
 /**
  * dynevent_arg_pair_init - Initialize a dynevent_arg_pair object
  * @arg_pair: A pointer to the dynevent_arg_pair struct representing the arg
- * @check_arg: An (optional) pointer to a function checking arg sanity
  * @operator: An (optional) operator, appended after adding the first arg
  * @separator: An (optional) separator, appended after adding the second arg
  *
@@ -422,16 +421,13 @@  void dynevent_arg_init(struct dynevent_arg *arg,
  * variable_name;' or 'x+y' to the current command string.  An
  * argument pair consists of a left-hand-side argument and a
  * right-hand-side argument separated by an operator, which can be
- * whitespace, all followed by a separator, if applicable. The
- * @check_arg function, if present, will be used to check the sanity
- * of the current arg strings (which is directly set by the caller).
- * After the first arg string is successfully appended to the command
- * string, the optional @operator is appended, followed by the second
- * arg and and optional @separator.  If no separator was specified
- * when initializing the arg, a space will be appended.
+ * whitespace, all followed by a separator, if applicable.  After the
+ * first arg string is successfully appended to the command string,
+ * the optional @operator is appended, followed by the second arg and
+ * and optional @separator.  If no separator was specified when
+ * initializing the arg, a space will be appended.
  */
 void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
-			    dynevent_check_arg_fn_t check_arg,
 			    char operator, char separator)
 {
 	memset(arg_pair, '\0', sizeof(*arg_pair));
@@ -443,8 +439,6 @@  void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
 	if (!separator)
 		separator = ' ';
 	arg_pair->separator = separator;
-
-	arg_pair->check_arg = check_arg;
 }
 
 /**
diff --git a/kernel/trace/trace_dynevent.h b/kernel/trace/trace_dynevent.h
index b593fc34c5b1..d6857a254ede 100644
--- a/kernel/trace/trace_dynevent.h
+++ b/kernel/trace/trace_dynevent.h
@@ -126,28 +126,27 @@  typedef int (*dynevent_check_arg_fn_t)(void *data);
 struct dynevent_arg {
 	const char		*str;
 	char			separator; /* e.g. ';', ',', or nothing */
-	dynevent_check_arg_fn_t	check_arg;
 };
 
 extern void dynevent_arg_init(struct dynevent_arg *arg,
-			      dynevent_check_arg_fn_t check_arg,
 			      char separator);
 extern int dynevent_arg_add(struct dynevent_cmd *cmd,
-			    struct dynevent_arg *arg);
+			    struct dynevent_arg *arg,
+			    dynevent_check_arg_fn_t check_arg);
 
 struct dynevent_arg_pair {
 	const char		*lhs;
 	const char		*rhs;
 	char			operator; /* e.g. '=' or nothing */
 	char			separator; /* e.g. ';', ',', or nothing */
-	dynevent_check_arg_fn_t	check_arg;
 };
 
 extern void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,
-				   dynevent_check_arg_fn_t check_arg,
 				   char operator, char separator);
+
 extern int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
-				 struct dynevent_arg_pair *arg_pair);
+				 struct dynevent_arg_pair *arg_pair,
+				 dynevent_check_arg_fn_t check_arg);
 extern int dynevent_str_add(struct dynevent_cmd *cmd, const char *str);
 
 #endif
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 772bd3d7c29f..a566f5d290c1 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1334,12 +1334,12 @@  int synth_event_add_field(struct dynevent_cmd *cmd, const char *type,
 	if (!type || !name)
 		return -EINVAL;
 
-	dynevent_arg_pair_init(&arg_pair, synth_event_check_arg_fn, 0, ';');
+	dynevent_arg_pair_init(&arg_pair, 0, ';');
 
 	arg_pair.lhs = type;
 	arg_pair.rhs = name;
 
-	ret = dynevent_arg_pair_add(cmd, &arg_pair);
+	ret = dynevent_arg_pair_add(cmd, &arg_pair, synth_event_check_arg_fn);
 	if (ret)
 		return ret;
 
@@ -1377,11 +1377,11 @@  int synth_event_add_field_str(struct dynevent_cmd *cmd, const char *type_name)
 	if (!type_name)
 		return -EINVAL;
 
-	dynevent_arg_init(&arg, NULL, ';');
+	dynevent_arg_init(&arg, ';');
 
 	arg.str = type_name;
 
-	ret = dynevent_arg_add(cmd, &arg);
+	ret = dynevent_arg_add(cmd, &arg, NULL);
 	if (ret)
 		return ret;
 
@@ -1472,9 +1472,9 @@  int __synth_event_gen_cmd_start(struct dynevent_cmd *cmd, const char *name,
 	if (cmd->type != DYNEVENT_TYPE_SYNTH)
 		return -EINVAL;
 
-	dynevent_arg_init(&arg, NULL, 0);
+	dynevent_arg_init(&arg, 0);
 	arg.str = name;
-	ret = dynevent_arg_add(cmd, &arg);
+	ret = dynevent_arg_add(cmd, &arg, NULL);
 	if (ret)
 		return ret;
 
@@ -1546,9 +1546,9 @@  int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd, const char *name,
 	if (n_fields > SYNTH_FIELDS_MAX)
 		return -EINVAL;
 
-	dynevent_arg_init(&arg, NULL, 0);
+	dynevent_arg_init(&arg, 0);
 	arg.str = name;
-	ret = dynevent_arg_add(cmd, &arg);
+	ret = dynevent_arg_add(cmd, &arg, NULL);
 	if (ret)
 		return ret;
 
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 307abb724a71..fe183d4045d2 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -962,9 +962,9 @@  int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
 	if (ret)
 		return ret;
 
-	dynevent_arg_init(&arg, NULL, 0);
+	dynevent_arg_init(&arg, 0);
 	arg.str = loc;
-	ret = dynevent_arg_add(cmd, &arg);
+	ret = dynevent_arg_add(cmd, &arg, NULL);
 	if (ret)
 		return ret;
 
@@ -982,7 +982,7 @@  int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
 		}
 
 		arg.str = field;
-		ret = dynevent_arg_add(cmd, &arg);
+		ret = dynevent_arg_add(cmd, &arg, NULL);
 		if (ret)
 			break;
 	}
@@ -1017,7 +1017,7 @@  int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...)
 	if (cmd->type != DYNEVENT_TYPE_KPROBE)
 		return -EINVAL;
 
-	dynevent_arg_init(&arg, NULL, 0);
+	dynevent_arg_init(&arg, 0);
 
 	va_start(args, cmd);
 	for (;;) {
@@ -1033,7 +1033,7 @@  int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...)
 		}
 
 		arg.str = field;
-		ret = dynevent_arg_add(cmd, &arg);
+		ret = dynevent_arg_add(cmd, &arg, NULL);
 		if (ret)
 			break;
 	}