linux-kernel - Re: [PATCH] tracing/synthetic: use union instead of casts

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Date:   Tue, 8 Aug 2023 16:05:47 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sven Schnelle <svens@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing/synthetic: use union instead of casts

On Tue, 08 Aug 2023 19:33:06 +0200
Sven Schnelle <svens@...ux.ibm.com> wrote:

> Steven Rostedt <rostedt@...dmis.org> writes:
> 
> > The "dynamic" I was using wasn't about the fields were dynamic (union), but
> > because the field the offset/len combo represents is of dynamic size. It's
> > used all over the trace_events code.
> >
> > I would have in include/linux/trace_events.h (right above struct trace_entry):
> >
> > /* Used to find the offset and length of dynamic fields in trace events */
> > struct trace_dynamic_info {
> > #ifdef CONFIG_CPU_BIG_ENDIAN
> > 	u16 offset;
> > 	u16 len;
> > #else
> > 	u16 len;
> > 	u16 offset;
> > #endif
> > };
> >
> > And then it kernel/trace/trace.h:
> >
> > union trace_synthetic_field {
> > 	u8				as_u8;
> > 	u16				as_u16;
> > 	u32				as_u32;
> > 	u64				as_u64;
> > 	struct trace_dynamic_info	as_dynamic;
> > };  
> 
> Ok.
> 
> > I could work on the part of the trace_dynamic_info if you want.  
> 
> Whatever you prefer. Should i update my patch and send it again, or do
> you want to adjust it?
>

How quickly do you need it. I can hopefully start working on it this week.

-- Steve