linux-kernel - Re: [PATCH 3/3] tracing: move tracing declarations from kernel.h to a dedicated header

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Message-ID: <aStX3242e3mo5H05@smile.fi.intel.com>
Date: Sat, 29 Nov 2025 22:30:23 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: "Yury Norov (NVIDIA)" <yury.norov@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Daniel Gomez <da.gomez@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-modules@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] tracing: move tracing declarations from kernel.h to
 a dedicated header

On Sat, Nov 29, 2025 at 02:53:02PM -0500, Yury Norov (NVIDIA) wrote:
> Tracing is a half of the kernel.h in terms of LOCs, although it's a
> self-consistent part. Move it to a separate header.
> 
> This is a pure move, except for removing a few 'extern's.

Yeah, I also have something similar (but half-baked) locally, the Q I wanted to
ask is why a separate header? We have already some of tracing headers. Doesn't
suit well?

...

> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -27,6 +27,7 @@
>  #include <linux/math.h>
>  #include <linux/minmax.h>
>  #include <linux/typecheck.h>

> +#include <linux/tracing.h>

There is better place for t*.h, i.e. after static_call_types.h.

Btw, have you tried to sort alphabetically the bulk in the kernel.h after
your series. Does it still build? (Just wondering about state of affairs
with the possible cyclic dependencies.)

>  #include <linux/panic.h>
>  #include <linux/printk.h>
>  #include <linux/build_bug.h>

-- 
With Best Regards,
Andy Shevchenko