[PATCH 5.15 105/117] tracing: Use alignof__(struct {type b;}) instead of offsetof()

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From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>

commit 09794a5a6c348f629b35fc1687071a1622ef4265 upstream.

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@xxxxxxxxxxxxxxxx/
Link: https://lkml.kernel.org/r/20220802154412.513c50e3@xxxxxxxxxxxxxxxxxx

Suggested-by: David Laight <David.Laight@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 include/trace/trace_events.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/trace/trace_events.h
+++ b/include/trace/trace_events.h
@@ -479,7 +479,7 @@ static struct trace_event_functions trac
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
-#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) {			\





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