linux-kernel - Re: [for-next][PATCH 21/21] tracing: Use a struct alignof to determine trace event field alignment

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Date:   Mon, 1 Aug 2022 17:08:06 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [for-next][PATCH 21/21] tracing: Use a struct alignof to
 determine trace event field alignment

On Mon, 1 Aug 2022 07:46:22 +0000
David Laight <David.Laight@...LAB.COM> wrote:

> > Define a macro as:
> > 
> >    ALIGN_STRUCTFIELD(type) ((int)(offsetof(struct {char a; type b;}, b)))
> > 
> > which gives the actual alignment of types in a structure.  
> 
> The simpler:
> 	__alignof__(struct {type b;})
> also works.

I'll have to try that out.

For now, as the previous version made it through all my tests, I may be
pushing it, but change it to this for simplicity if that also works and
passes all my test.

Thanks,

-- Steve