* [PATCH] tracing: Use alignof__(struct {type b;}) instead of offsetof()
@ 2022-08-02 19:44 Steven Rostedt
0 siblings, 0 replies; only message in thread
From: Steven Rostedt @ 2022-08-02 19:44 UTC (permalink / raw)
To: LKML
Cc: Ingo Molnar, Andrew Morton, Peter Zijlstra, Thomas Gleixner,
Masami Hiramatsu, David Laight
From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
Simplify:
#define ALIGN_STRUCTFIELD(type) ((int)(offsetof(struct {char a; type b;}, b)))
with
#define ALIGN_STRUCTFIELD(type) __alignof__(struct {type b;})
Which works just the same.
Link: https://lore.kernel.org/all/a7d202457150472588df0bd3b7334b3f@AcuMS.aculab.com/
Suggested-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
include/trace/stages/stage4_event_fields.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/trace/stages/stage4_event_fields.h b/include/trace/stages/stage4_event_fields.h
index 80d34f396555..a8fb25f39a99 100644
--- a/include/trace/stages/stage4_event_fields.h
+++ b/include/trace/stages/stage4_event_fields.h
@@ -2,7 +2,7 @@
/* Stage 4 definitions for creating trace events */
-#define ALIGN_STRUCTFIELD(type) ((int)(offsetof(struct {char a; type b;}, b)))
+#define ALIGN_STRUCTFIELD(type) ((int)(__alignof__(struct {type b;})))
#undef __field_ext
#define __field_ext(_type, _item, _filter_type) { \
--
2.35.1
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2022-08-02 19:44 [PATCH] tracing: Use alignof__(struct {type b;}) instead of offsetof() Steven Rostedt
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