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tracing: Add __get_dynamic_array_len() macro for trace events

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If a trace event uses a dynamic array for something other than a string
then there's currently no way the TP_printk() can figure out what size
it is. A __get_dynamic_array_len() is required to know the length.

This also simplifies the __get_bitmask() macro which required it as well,
but instead just hardcoded it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-06-04 14:29:33 -04:00 committed by Steven Rostedt
parent 195d280201
commit beba4bb096
1 changed files with 10 additions and 1 deletions
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11
include/trace/ftrace.h
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@ -203,6 +203,10 @@
#define __get_dynamic_array(field) \
((void *)__entry + (__entry->__data_loc_##field & 0xffff))
#undef __get_dynamic_array_len
#define __get_dynamic_array_len(field) \
((__entry->__data_loc_##field >> 16) & 0xffff)
#undef __get_str
#define __get_str(field) (char *)__get_dynamic_array(field)
@ -211,7 +215,7 @@
({ \
void *__bitmask = __get_dynamic_array(field); \
unsigned int __bitmask_size; \
__bitmask_size = (__entry->__data_loc_##field >> 16) & 0xffff; \
__bitmask_size = __get_dynamic_array_len(field); \
ftrace_print_bitmask_seq(p, __bitmask, __bitmask_size); \
})
@ -636,6 +640,7 @@ static inline void ftrace_test_probe_##call(void) \
#undef __print_symbolic
#undef __print_hex
#undef __get_dynamic_array
#undef __get_dynamic_array_len
#undef __get_str
#undef __get_bitmask
@ -700,6 +705,10 @@ __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
#define __get_dynamic_array(field) \
((void *)__entry + (__entry->__data_loc_##field & 0xffff))
#undef __get_dynamic_array_len
#define __get_dynamic_array_len(field) \
((__entry->__data_loc_##field >> 16) & 0xffff)
#undef __get_str
#define __get_str(field) (char *)__get_dynamic_array(field)