linux-kernel - Re: [PATCH v4 7/7] kernel.h: drop trace

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Message-ID: <aVOTbArAxmbT5LY9@smile.fi.intel.com>
Date: Tue, 30 Dec 2025 10:55:08 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Yury Norov (NVIDIA)" <yury.norov@...il.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Christophe Leroy <chleroy@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	David Laight <david.laight@...box.com>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Daniel Gomez <da.gomez@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.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 v4 7/7] kernel.h: drop trace_printk.h

On Mon, Dec 29, 2025 at 05:25:08PM -0500, Mathieu Desnoyers wrote:

...

> One possible compromise would be to move it to its own header file,
> and introduce a CONFIG_TRACE_PRINTK Kconfig option (default Y) that
> would surround an include from linux/kernel.h with a preprocessor
> conditional. But please make sure the default stays as it is today:
> include the trace printk header by default.

"by default" where exactly? The problem is that kernel.h is a total mess and
it's included in a lot of mysterious ways (indirectly), and in C you _must_
include a header anyway for a custom API, just define *which* one.

Based on the Steven's first replies I see a compromise in having it inside
printk.h. If you want to debug something with printf() (in general) the same
header should provide all species. Do you agree?

-- 
With Best Regards,
Andy Shevchenko