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tracing: Use alignof__(struct {type b;}) instead of offsetof()

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commit 09794a5a6c 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@AcuMS.aculab.com/
Link: https://lkml.kernel.org/r/20220802154412.513c50e3@gandalf.local.home

Suggested-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Google)
2022-08-02 15:44:12 -04:00
committed by Greg Kroah-Hartman
parent 03ba86bb38
commit c6e3c12ff9
1 changed files with 1 additions and 1 deletions
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2
include/trace/trace_events.h
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@@ -400,7 +400,7 @@ static struct trace_event_functions trace_event_type_funcs_##call = { \
#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) { \