Date:	Wed, 14 May 2014 20:42:41 +0100
From:	Javi Merino <javi.merino@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC][PATCH v3] tracing: Add __bitmask() macro to trace events
 to cpumasks and other bitmasks

On Wed, May 14, 2014 at 07:25:00PM +0100, Steven Rostedt wrote:
> Updated version.
> 
> You can test it with the attached trace-cmd patch. I tested it against
> big and little endian machines (each reading their own and the other
> machine's trace.dat file). I did not test against 32bit, but it should
> still work. I will test it before I commit it to traceevent library.
> 
> Can you review this and try it out?

I've tested it in a 32-bit system.  It generates the data and it's
able to read its own trace.dat fine.  However, If I read the
trace.dat on a 64-bit machine I get a random character at the
end of the mask:

$ ./trace-cmd report /tmp/trace.dat | grep thermal_power_limit
trace-cmd: No such file or directory
  bad op token {
  unknown op '{'
  unknown op '{'
  function scsi_trace_parse_cdb not defined
  function scsi_trace_parse_cdb not defined
  function scsi_trace_parse_cdb not defined
  function scsi_trace_parse_cdb not defined
  bad op token {
  bad op token {
  bad op token {
  bad op token {
  Error: expected type 4 but read 0
  bad op token {
  bad op token {
  Error: expected type 4 but read 0
  function jiffies_to_msecs not defined
  function jiffies_to_msecs not defined
  bad op token {
  bad op token {
 test_thermal.sh-2886  [000]    30.035000: thermal_power_limit: cpus=000000f0` freq=1400000 cdev_state=0 power=196
 test_thermal.sh-2886  [000]    30.035000: thermal_power_limit: cpus=0000000fP freq=1900000 cdev_state=0 power=5252
     kworker/0:1-195   [000]    34.265000: thermal_power_limit: cpus=000000f0� freq=1400000 cdev_state=0 power=196
     kworker/0:1-195   [000]    34.265000: thermal_power_limit: cpus=0000000f� freq=1900000 cdev_state=0 power=5252
 test_thermal.sh-2886  [000]    38.375000: thermal_power_limit: cpus=000000f0� freq=1400000 cdev_state=0 power=196
 test_thermal.sh-2886  [000]    38.375000: thermal_power_limit: cpus=0000000f@ freq=1900000 cdev_state=0 power=5252
     kworker/0:1-195   [000]    38.380000: thermal_power_limit: cpus=000000f0freq=500000 cdev_state=9 power=0
     kworker/0:1-195   [000]    38.380000: thermal_power_limit: cpus=0000000f0 freq=1900000 cdev_state=0 power=1745
     kworker/0:1-195   [000]    48.415000: thermal_power_limit: cpus=000000f0� freq=500000 cdev_state=9 power=0
     kworker/0:1-195   [000]    48.415000: thermal_power_limit: cpus=0000000f� freq=1900000 cdev_state=0 power=1740k

It looks like an off-by-one error.  The system that generated the
trace.dat is running a kernel configured with NR_CPUS=5, can that be
the culprit?

FWIW, this is the event I'm using:

TRACE_EVENT(thermal_power_limit,
	TP_PROTO(const struct cpumask *cpus, unsigned int freq, unsigned long cdev_state,
		unsigned long power),

	TP_ARGS(cpus, freq, cdev_state, power),

	TP_STRUCT__entry(
		__bitmask(cpumask, num_possible_cpus())
		__field(unsigned int,  freq      )
		__field(unsigned long, cdev_state)
		__field(unsigned long, power     )
	),

	TP_fast_assign(
		__assign_bitmask(cpumask, cpumask_bits(cpus), num_possible_cpus());
		__entry->freq = freq;
		__entry->cdev_state = cdev_state;
		__entry->power = power;
	),

	TP_printk("cpus=%s freq=%u cdev_state=%lu power=%lu",
		__get_bitmask(cpumask), __entry->freq, __entry->cdev_state,
		__entry->power)
);

Thanks!
Javi

> From be2f29847428f5a290496d1c44ad938f2c2ad040 Mon Sep 17 00:00:00 2001
> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> Date: Tue, 6 May 2014 13:10:24 -0400
> Subject: [PATCH] tracing: Add __bitmask() macro to trace events to cpumasks
>  and other bitmasks
> 
> Being able to show a cpumask of events can be useful as some events
> may affect only some CPUs. There is no standard way to record the
> cpumask and converting it to a string is rather expensive during
> the trace as traces happen in hotpaths. It would be better to record
> the raw event mask and be able to parse it at print time.
> 
> The following macros were added for use with the TRACE_EVENT() macro:
> 
>   __bitmask()
>   __assign_bitmask()
>   __get_bitmask()
> 
> To test this, I added this to the sched_migrate_task event, which
> looked like this:
> 
> TRACE_EVENT(sched_migrate_task,
> 
> 	TP_PROTO(struct task_struct *p, int dest_cpu, const struct cpumask *cpus),
> 
> 	TP_ARGS(p, dest_cpu, cpus),
> 
> 	TP_STRUCT__entry(
> 		__array(	char,	comm,	TASK_COMM_LEN	)
> 		__field(	pid_t,	pid			)
> 		__field(	int,	prio			)
> 		__field(	int,	orig_cpu		)
> 		__field(	int,	dest_cpu		)
> 		__bitmask(	cpumask, num_possible_cpus()	)
> 	),
> 
> 	TP_fast_assign(
> 		memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
> 		__entry->pid		= p->pid;
> 		__entry->prio		= p->prio;
> 		__entry->orig_cpu	= task_cpu(p);
> 		__entry->dest_cpu	= dest_cpu;
> 		__assign_bitmask(cpumask, cpumask_bits(cpus), num_possible_cpus());
> 	),
> 
> 	TP_printk("comm=%s pid=%d prio=%d orig_cpu=%d dest_cpu=%d cpumask=%s",
> 		  __entry->comm, __entry->pid, __entry->prio,
> 		  __entry->orig_cpu, __entry->dest_cpu,
> 		  __get_bitmask(cpumask))
> );
> 
> With the output of:
> 
>         ksmtuned-3613  [003] d..2   485.220508: sched_migrate_task: comm=ksmtuned pid=3615 prio=120 orig_cpu=3 dest_cpu=2 cpumask=00000000,0000000f
>      migration/1-13    [001] d..5   485.221202: sched_migrate_task: comm=ksmtuned pid=3614 prio=120 orig_cpu=1 dest_cpu=0 cpumask=00000000,0000000f
>              awk-3615  [002] d.H5   485.221747: sched_migrate_task: comm=rcu_preempt pid=7 prio=120 orig_cpu=0 dest_cpu=1 cpumask=00000000,000000ff
>      migration/2-18    [002] d..5   485.222062: sched_migrate_task: comm=ksmtuned pid=3615 prio=120 orig_cpu=2 dest_cpu=3 cpumask=00000000,0000000f
> 
> Link: http://lkml.kernel.org/r/1399377998-14870-6-git-send-email-javi.merino@arm.com
> 
> Suggested-by: Javi Merino <javi.merino@....com>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  include/linux/ftrace_event.h |  3 +++
>  include/linux/trace_seq.h    | 10 ++++++++
>  include/trace/ftrace.h       | 57 +++++++++++++++++++++++++++++++++++++++++++-
>  kernel/trace/trace_output.c  | 41 +++++++++++++++++++++++++++++++
>  4 files changed, 110 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
> index d16da3e..cff3106 100644
> --- a/include/linux/ftrace_event.h
> +++ b/include/linux/ftrace_event.h
> @@ -38,6 +38,9 @@ const char *ftrace_print_symbols_seq_u64(struct trace_seq *p,
>  								 *symbol_array);
>  #endif
>  
> +const char *ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
> +				     unsigned int bitmask_size);
> +
>  const char *ftrace_print_hex_seq(struct trace_seq *p,
>  				 const unsigned char *buf, int len);
>  
> diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h
> index a32d86e..1361169 100644
> --- a/include/linux/trace_seq.h
> +++ b/include/linux/trace_seq.h
> @@ -46,6 +46,9 @@ extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
>  extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
>  extern int trace_seq_path(struct trace_seq *s, const struct path *path);
>  
> +extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
> +			     int nmaskbits);
> +
>  #else /* CONFIG_TRACING */
>  static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
>  {
> @@ -57,6 +60,13 @@ trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
>  	return 0;
>  }
>  
> +static inline int
> +trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
> +		  int nmaskbits)
> +{
> +	return 0;
> +}
> +
>  static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
>  {
>  	return 0;
> diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
> index 0a1a4f7..9b7a989 100644
> --- a/include/trace/ftrace.h
> +++ b/include/trace/ftrace.h
> @@ -53,6 +53,9 @@
>  #undef __string
>  #define __string(item, src) __dynamic_array(char, item, -1)
>  
> +#undef __bitmask
> +#define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
> +
>  #undef TP_STRUCT__entry
>  #define TP_STRUCT__entry(args...) args
>  
> @@ -128,6 +131,9 @@
>  #undef __string
>  #define __string(item, src) __dynamic_array(char, item, -1)
>  
> +#undef __bitmask
> +#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
> +
>  #undef DECLARE_EVENT_CLASS
>  #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
>  	struct ftrace_data_offsets_##call {				\
> @@ -200,6 +206,15 @@
>  #undef __get_str
>  #define __get_str(field) (char *)__get_dynamic_array(field)
>  
> +#undef __get_bitmask
> +#define __get_bitmask(field)						\
> +	({								\
> +		void *__bitmask = __get_dynamic_array(field);		\
> +		unsigned int __bitmask_size;				\
> +		__bitmask_size = (__entry->__data_loc_##field >> 16) & 0xffff; \
> +		ftrace_print_bitmask_seq(p, __bitmask, __bitmask_size);	\
> +	})
> +
>  #undef __print_flags
>  #define __print_flags(flag, delim, flag_array...)			\
>  	({								\
> @@ -322,6 +337,9 @@ static struct trace_event_functions ftrace_event_type_funcs_##call = {	\
>  #undef __string
>  #define __string(item, src) __dynamic_array(char, item, -1)
>  
> +#undef __bitmask
> +#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
> +
>  #undef DECLARE_EVENT_CLASS
>  #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)	\
>  static int notrace __init						\
> @@ -372,6 +390,29 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call)	\
>  #define __string(item, src) __dynamic_array(char, item,			\
>  		    strlen((src) ? (const char *)(src) : "(null)") + 1)
>  
> +/*
> + * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
> + * num_possible_cpus().
> + */
> +#define __bitmask_size_in_bytes_raw(nr_bits)	\
> +	(((nr_bits) + 7) / 8)
> +
> +#define __bitmask_size_in_longs(nr_bits)			\
> +	((__bitmask_size_in_bytes_raw(nr_bits) +		\
> +	  ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
> +
> +/*
> + * __bitmask_size_in_bytes is the number of bytes needed to hold
> + * num_possible_cpus() padded out to the nearest long. This is what
> + * is saved in the buffer, just to be consistent.
> + */
> +#define __bitmask_size_in_bytes(nr_bits)				\
> +	(__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
> +
> +#undef __bitmask
> +#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,	\
> +					 __bitmask_size_in_longs(nr_bits))
> +
>  #undef DECLARE_EVENT_CLASS
>  #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
>  static inline notrace int ftrace_get_offsets_##call(			\
> @@ -513,12 +554,22 @@ static inline notrace int ftrace_get_offsets_##call(			\
>  	__entry->__data_loc_##item = __data_offsets.item;
>  
>  #undef __string
> -#define __string(item, src) __dynamic_array(char, item, -1)       	\
> +#define __string(item, src) __dynamic_array(char, item, -1)
>  
>  #undef __assign_str
>  #define __assign_str(dst, src)						\
>  	strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
>  
> +#undef __bitmask
> +#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
> +
> +#undef __get_bitmask
> +#define __get_bitmask(field) (char *)__get_dynamic_array(field)
> +
> +#undef __assign_bitmask
> +#define __assign_bitmask(dst, src, nr_bits)					\
> +	memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
> +
>  #undef TP_fast_assign
>  #define TP_fast_assign(args...) args
>  
> @@ -586,6 +637,7 @@ static inline void ftrace_test_probe_##call(void)			\
>  #undef __print_hex
>  #undef __get_dynamic_array
>  #undef __get_str
> +#undef __get_bitmask
>  
>  #undef TP_printk
>  #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
> @@ -651,6 +703,9 @@ __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
>  #undef __get_str
>  #define __get_str(field) (char *)__get_dynamic_array(field)
>  
> +#undef __get_bitmask
> +#define __get_bitmask(field) (char *)__get_dynamic_array(field)
> +
>  #undef __perf_addr
>  #define __perf_addr(a)	(__addr = (a))
>  
> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
> index a436de1..f3dad80 100644
> --- a/kernel/trace/trace_output.c
> +++ b/kernel/trace/trace_output.c
> @@ -126,6 +126,34 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
>  EXPORT_SYMBOL_GPL(trace_seq_printf);
>  
>  /**
> + * trace_seq_bitmask - put a list of longs as a bitmask print output
> + * @s:		trace sequence descriptor
> + * @maskp:	points to an array of unsigned longs that represent a bitmask
> + * @nmaskbits:	The number of bits that are valid in @maskp
> + *
> + * It returns 0 if the trace oversizes the buffer's free
> + * space, 1 otherwise.
> + *
> + * Writes a ASCII representation of a bitmask string into @s.
> + */
> +int
> +trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
> +		  int nmaskbits)
> +{
> +	int len = (PAGE_SIZE - 1) - s->len;
> +	int ret;
> +
> +	if (s->full || !len)
> +		return 0;
> +
> +	ret = bitmap_scnprintf(s->buffer, len, maskp, nmaskbits);
> +	s->len += ret;
> +
> +	return 1;
> +}
> +EXPORT_SYMBOL_GPL(trace_seq_bitmask);
> +
> +/**
>   * trace_seq_vprintf - sequence printing of trace information
>   * @s: trace sequence descriptor
>   * @fmt: printf format string
> @@ -399,6 +427,19 @@ EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
>  #endif
>  
>  const char *
> +ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
> +			 unsigned int bitmask_size)
> +{
> +	const char *ret = p->buffer + p->len;
> +
> +	trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
> +	trace_seq_putc(p, 0);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(ftrace_print_bitmask_seq);
> +
> +const char *
>  ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
>  {
>  	int i;
> -- 
> 1.8.1.4
> 

> diff --git a/event-parse.c b/event-parse.c
> index 114b41b..ca0d1fe 100644
> --- a/event-parse.c
> +++ b/event-parse.c
> @@ -753,6 +753,9 @@ static void free_arg(struct print_arg *arg)
>  	case PRINT_BSTRING:
>  		free(arg->string.string);
>  		break;
> +	case PRINT_BITMASK:
> +		free(arg->bitmask.bitmask);
> +		break;
>  	case PRINT_DYNAMIC_ARRAY:
>  		free(arg->dynarray.index);
>  		break;
> @@ -2256,6 +2259,7 @@ static int arg_num_eval(struct print_arg *arg, long long *val)
>  	case PRINT_FIELD ... PRINT_SYMBOL:
>  	case PRINT_STRING:
>  	case PRINT_BSTRING:
> +	case PRINT_BITMASK:
>  	default:
>  		do_warning("invalid eval type %d", arg->type);
>  		ret = 0;
> @@ -2284,6 +2288,7 @@ static char *arg_eval (struct print_arg *arg)
>  	case PRINT_FIELD ... PRINT_SYMBOL:
>  	case PRINT_STRING:
>  	case PRINT_BSTRING:
> +	case PRINT_BITMASK:
>  	default:
>  		do_warning("invalid eval type %d", arg->type);
>  		break;
> @@ -2670,6 +2675,35 @@ process_str(struct event_format *event __maybe_unused, struct print_arg *arg,
>  	return EVENT_ERROR;
>  }
>  
> +static enum event_type
> +process_bitmask(struct event_format *event __maybe_unused, struct print_arg *arg,
> +	    char **tok)
> +{
> +	enum event_type type;
> +	char *token;
> +
> +	if (read_expect_type(EVENT_ITEM, &token) < 0)
> +		goto out_free;
> +
> +	arg->type = PRINT_BITMASK;
> +	arg->bitmask.bitmask = token;
> +	arg->bitmask.offset = -1;
> +
> +	if (read_expected(EVENT_DELIM, ")") < 0)
> +		goto out_err;
> +
> +	type = read_token(&token);
> +	*tok = token;
> +
> +	return type;
> +
> + out_free:
> +	free_token(token);
> + out_err:
> +	*tok = NULL;
> +	return EVENT_ERROR;
> +}
> +
>  static struct pevent_function_handler *
>  find_func_handler(struct pevent *pevent, char *func_name)
>  {
> @@ -2781,6 +2815,10 @@ process_function(struct event_format *event, struct print_arg *arg,
>  		free_token(token);
>  		return process_str(event, arg, tok);
>  	}
> +	if (strcmp(token, "__get_bitmask") == 0) {
> +		free_token(token);
> +		return process_bitmask(event, arg, tok);
> +	}
>  	if (strcmp(token, "__get_dynamic_array") == 0) {
>  		free_token(token);
>  		return process_dynamic_array(event, arg, tok);
> @@ -3307,6 +3345,7 @@ eval_num_arg(void *data, int size, struct event_format *event, struct print_arg
>  		return eval_type(val, arg, 0);
>  	case PRINT_STRING:
>  	case PRINT_BSTRING:
> +	case PRINT_BITMASK:
>  		return 0;
>  	case PRINT_FUNC: {
>  		struct trace_seq s;
> @@ -3538,6 +3577,60 @@ static void print_str_to_seq(struct trace_seq *s, const char *format,
>  		trace_seq_printf(s, format, str);
>  }
>  
> +static void print_bitmask_to_seq(struct pevent *pevent,
> +				 struct trace_seq *s, const char *format,
> +				 int len_arg, const void *data, int size)
> +{
> +	int nr_bits = size * 8;
> +	int str_size = (nr_bits + 3) / 4;
> +	int len = 0;
> +	char buf[3];
> +	char *str;
> +	int index;
> +	int i;
> +
> +	/*
> +	 * The kernel likes to put in commas every 32 bits, we
> +	 * can do the same.
> +	 */
> +	str_size += nr_bits / 32;
> +
> +	str = malloc(str_size + 1);
> +	if (!str) {
> +		do_warning("%s: not enough memory!", __func__);
> +		return;
> +	}
> +	str[str_size] = 0;
> +
> +	/* Start out with -3, 1 for the \0 and two for the byte */
> +	for (i = str_size - 3; i >= 0; i -= 2) {
> +		/*
> +		 * data points to a bit mask of size bytes.
> +		 * In the kernel, this is an array of long words, thus
> +		 * endianess is very important.
> +		 */
> +		if (pevent->file_bigendian)
> +			index = size - (len + 1);
> +		else
> +			index = len;
> +
> +		snprintf(buf, 3, "%02x", *((unsigned char *)data + index));
> +		memcpy(str + i, buf, 2);
> +		len++;
> +		if (!(len & 3) && i > 0) {
> +			i--;
> +			str[i] = ',';
> +		}
> +	}			
> +
> +	if (len_arg >= 0)
> +		trace_seq_printf(s, format, len_arg, str);
> +	else
> +		trace_seq_printf(s, format, str);
> +
> +	free(str);
> +}
> +
>  static void print_str_arg(struct trace_seq *s, void *data, int size,
>  			  struct event_format *event, const char *format,
>  			  int len_arg, struct print_arg *arg)
> @@ -3672,6 +3765,23 @@ static void print_str_arg(struct trace_seq *s, void *data, int size,
>  	case PRINT_BSTRING:
>  		print_str_to_seq(s, format, len_arg, arg->string.string);
>  		break;
> +	case PRINT_BITMASK: {
> +		int bitmask_offset;
> +		int bitmask_size;
> +
> +		if (arg->bitmask.offset == -1) {
> +			struct format_field *f;
> +
> +			f = pevent_find_any_field(event, arg->bitmask.bitmask);
> +			arg->bitmask.offset = f->offset;
> +		}
> +		bitmask_offset = data2host4(pevent, data + arg->string.offset);
> +		bitmask_size = bitmask_offset >> 16;
> +		bitmask_offset &= 0xffff;
> +		print_bitmask_to_seq(pevent, s, format, len_arg,
> +				     data + bitmask_offset, bitmask_size);
> +		break;
> +	}
>  	case PRINT_OP:
>  		/*
>  		 * The only op for string should be ? :
> @@ -4889,6 +4999,9 @@ static void print_args(struct print_arg *args)
>  	case PRINT_BSTRING:
>  		printf("__get_str(%s)", args->string.string);
>  		break;
> +	case PRINT_BITMASK:
> +		printf("__get_bitmask(%s)", args->bitmask.bitmask);
> +		break;
>  	case PRINT_TYPE:
>  		printf("(%s)", args->typecast.type);
>  		print_args(args->typecast.item);
> diff --git a/event-parse.h b/event-parse.h
> index 108a4ef..babd4a4 100644
> --- a/event-parse.h
> +++ b/event-parse.h
> @@ -211,6 +211,11 @@ struct print_arg_string {
>  	int			offset;
>  };
>  
> +struct print_arg_bitmask {
> +	char			*bitmask;
> +	int			offset;
> +};
> +
>  struct print_arg_field {
>  	char			*name;
>  	struct format_field	*field;
> @@ -277,6 +282,7 @@ enum print_arg_type {
>  	PRINT_DYNAMIC_ARRAY,
>  	PRINT_OP,
>  	PRINT_FUNC,
> +	PRINT_BITMASK,
>  };
>  
>  struct print_arg {
> @@ -291,6 +297,7 @@ struct print_arg {
>  		struct print_arg_hex		hex;
>  		struct print_arg_func		func;
>  		struct print_arg_string		string;
> +		struct print_arg_bitmask	bitmask;
>  		struct print_arg_op		op;
>  		struct print_arg_dynarray	dynarray;
>  	};

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