linux-kernel - Re: [PATCH 1/7] vsprintf: Add %pTN to print task name

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Message-ID: <Z1vq2-V7vB5KhBR9@pathway.suse.cz>
Date: Fri, 13 Dec 2024 09:05:47 +0100
From: Petr Mladek <pmladek@...e.com>
To: Yafang Shao <laoar.shao@...il.com>
Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org,
	x86@...nel.org, linux-snps-arc@...ts.infradead.org,
	linux-wireless@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, ocfs2-devel@...ts.linux.dev,
	Steven Rostedt <rostedt@...dmis.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
	Dwaipayan Ray <dwaipayanray1@...il.com>,
	Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: Re: [PATCH 1/7] vsprintf: Add %pTN to print task name

On Fri 2024-12-13 13:46:04, Yafang Shao wrote:
> Since the task->comm is guaranteed to be NUL-ternimated, we can print it
> directly. Add a new vsnprintf format specifier "%pTN" to print task comm,
> where 'p' represents the task Pointer, 'T' stands for Task, and 'N' denots
> Name. With this abstraction, the user no longer needs to care about
> retrieving task name.

What is the advantage, please?

Honestly, I believe that the meaning of

	printk("%s\n", task->comm);

is much more clear than using a cryptic %pXYZ modifier:

	printk("%pTN\n", task);


The %pXYZ modifiers makes sense only when the formatting of the printed
information needs some processing. But this is a plain string.
IMHO, it is not worth it. In fact, I believe that it is a
counter productive.

Best Regards,
Petr