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Message-ID: <20250424192613.183589150@goodmis.org>
Date: Thu, 24 Apr 2025 15:25:01 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Josh Poimboeuf <jpoimboe@...nel.org>,
x86@...nel.org,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Indu Bhagat <indu.bhagat@...cle.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-perf-users@...r.kernel.org,
Mark Brown <broonie@...nel.org>,
linux-toolchains@...r.kernel.org,
Jordan Rome <jordalgo@...a.com>,
Sam James <sam@...too.org>,
Andrii Nakryiko <andrii.nakryiko@...il.com>,
Jens Remus <jremus@...ux.ibm.com>,
Florian Weimer <fweimer@...hat.com>,
Andy Lutomirski <luto@...nel.org>,
Weinan Liu <wnliu@...gle.com>,
Blake Jones <blakejones@...gle.com>,
Beau Belgrave <beaub@...ux.microsoft.com>,
"Jose E. Marchesi" <jemarch@....org>,
Alexander Aring <aahringo@...hat.com>
Subject: [PATCH v5 5/9] tracing: Rename __dynamic_array() to __dynamic_field() for ftrace
events
From: Steven Rostedt <rostedt@...dmis.org>
The ftrace events (like function, trace_print, etc) are created somewhat
manually and not via the TRACE_EVENT() or tracepoint magic macros. It has
its own macros.
The dynamic fields used __dynamic_array() to be created, but the output is
different than the __dynamic_array() used by TRACE_EVENT().
The TRACE_EVENT() __dynamic_array() creates the field like:
field:__data_loc u8[] v_data; offset:120; size:4; signed:0;
Whereas the ftrace event is created as:
field:char buf[]; offset:12; size:0; signed:0;
The difference is that the ftrace field is defined as the rest of the size
of the event saved in the ring buffer. TRACE_EVENT() doesn't have such a
dynamic field, and its version saves a word that holds the offset into the
event that the field is stored, as well as the size.
For consistency rename the ftrace event macro to __dynamic_field(). This
way the ftrace event can also include a __dynamic_array() later that works
the same as the TRACE_EVENT() dynamic array.
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
kernel/trace/trace.h | 4 ++--
kernel/trace/trace_entries.h | 10 +++++-----
kernel/trace/trace_export.c | 12 ++++++------
3 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 79be1995db44..3c733b9e7b32 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -92,8 +92,8 @@ enum trace_type {
#undef __array_desc
#define __array_desc(type, container, item, size)
-#undef __dynamic_array
-#define __dynamic_array(type, item) type item[];
+#undef __dynamic_field
+#define __dynamic_field(type, item) type item[];
#undef __rel_dynamic_array
#define __rel_dynamic_array(type, item) type item[];
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index 4ef4df6623a8..7100d8f86011 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -63,7 +63,7 @@ FTRACE_ENTRY_REG(function, ftrace_entry,
F_STRUCT(
__field_fn( unsigned long, ip )
__field_fn( unsigned long, parent_ip )
- __dynamic_array( unsigned long, args )
+ __dynamic_field( unsigned long, args )
),
F_printk(" %ps <-- %ps",
@@ -81,7 +81,7 @@ FTRACE_ENTRY(funcgraph_entry, ftrace_graph_ent_entry,
__field_struct( struct ftrace_graph_ent, graph_ent )
__field_packed( unsigned long, graph_ent, func )
__field_packed( unsigned int, graph_ent, depth )
- __dynamic_array(unsigned long, args )
+ __dynamic_field(unsigned long, args )
),
F_printk("--> %ps (%u)", (void *)__entry->func, __entry->depth)
@@ -259,7 +259,7 @@ FTRACE_ENTRY(bprint, bprint_entry,
F_STRUCT(
__field( unsigned long, ip )
__field( const char *, fmt )
- __dynamic_array( u32, buf )
+ __dynamic_field( u32, buf )
),
F_printk("%ps: %s",
@@ -272,7 +272,7 @@ FTRACE_ENTRY_REG(print, print_entry,
F_STRUCT(
__field( unsigned long, ip )
- __dynamic_array( char, buf )
+ __dynamic_field( char, buf )
),
F_printk("%ps: %s",
@@ -287,7 +287,7 @@ FTRACE_ENTRY(raw_data, raw_data_entry,
F_STRUCT(
__field( unsigned int, id )
- __dynamic_array( char, buf )
+ __dynamic_field( char, buf )
),
F_printk("id:%04x %08x",
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 1698fc22afa0..d9d41e3ba379 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -57,8 +57,8 @@ static int ftrace_event_register(struct trace_event_call *call,
#undef __array_desc
#define __array_desc(type, container, item, size) type item[size];
-#undef __dynamic_array
-#define __dynamic_array(type, item) type item[];
+#undef __dynamic_field
+#define __dynamic_field(type, item) type item[];
#undef F_STRUCT
#define F_STRUCT(args...) args
@@ -123,8 +123,8 @@ static void __always_unused ____ftrace_check_##name(void) \
#undef __array_desc
#define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len)
-#undef __dynamic_array
-#define __dynamic_array(_type, _item) { \
+#undef __dynamic_field
+#define __dynamic_field(_type, _item) { \
.type = #_type "[]", .name = #_item, \
.size = 0, .align = __alignof__(_type), \
is_signed_type(_type), .filter_type = FILTER_OTHER },
@@ -161,8 +161,8 @@ static struct trace_event_fields ftrace_event_fields_##name[] = { \
#undef __array_desc
#define __array_desc(type, container, item, len)
-#undef __dynamic_array
-#define __dynamic_array(type, item)
+#undef __dynamic_field
+#define __dynamic_field(type, item)
#undef F_printk
#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
--
2.47.2
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