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tracing: Add __print_dynamic_array() helper

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When printing a dynamic array in a trace event, the method is rather ugly.
It has the format of:

  __print_array(__get_dynamic_array(array),
            __get_dynmaic_array_len(array) / el_size, el_size)

Since dynamic arrays are known to the tracing infrastructure, create a
helper macro that does the above for you.

  __print_dynamic_array(array, el_size)

Which would expand to the same output.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Avadhut Naik <avadhut.naik@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Link: https://lore.kernel.org/r/20241022194158.110073-3-avadhut.naik@amd.com
This commit is contained in:
Steven Rostedt 2024-10-22 19:36:28 +00:00 committed by Borislav Petkov (AMD)
parent 750fd23926
commit e52750fb14
3 changed files with 15 additions and 1 deletions
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8
include/trace/stages/stage3_trace_output.h
View File

@ -119,6 +119,14 @@
trace_print_array_seq(p, array, count, el_size); \
})
#undef __print_dynamic_array
#define __print_dynamic_array(array, el_size) \
({ \
__print_array(__get_dynamic_array(array), \
__get_dynamic_array_len(array) / (el_size), \
(el_size)); \
})
#undef __print_hex_dump
#define __print_hex_dump(prefix_str, prefix_type, \
rowsize, groupsize, buf, len, ascii) \

1
include/trace/stages/stage7_class_define.h
View File

@ -22,6 +22,7 @@
#undef __get_rel_cpumask
#undef __get_rel_sockaddr
#undef __print_array
#undef __print_dynamic_array
#undef __print_hex_dump
#undef __get_buf

7
samples/trace_events/trace-events-sample.h
View File

@ -319,7 +319,7 @@ TRACE_EVENT(foo_bar,
__assign_cpumask(cpum, cpumask_bits(mask));
),
TP_printk("foo %s %d %s %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
TP_printk("foo %s %d %s %s %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
/*
* Notice here the use of some helper functions. This includes:
@ -363,6 +363,11 @@ TRACE_EVENT(foo_bar,
__print_array(__get_dynamic_array(list),
__get_dynamic_array_len(list) / sizeof(int),
sizeof(int)),
/* A shortcut is to use __print_dynamic_array for dynamic arrays */
__print_dynamic_array(list, sizeof(int)),
__get_str(str), __get_str(lstr),
__get_bitmask(cpus), __get_cpumask(cpum),
__get_str(vstr))