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Date: Tue, 21 Oct 2025 13:55:53 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Doug Anderson <dianders@chromium.org>
Cc: linux-kernel@vger.kernel.org, Andrew Chant <achant@google.com>,
 Alexander Shishkin <alexander.shishkin@linux.intel.com>, Brian Gerst
 <brgerst@gmail.com>, Christian Brauner <brauner@kernel.org>, Francesco
 Valla <francesco@valla.it>, Geert Uytterhoeven <geert+renesas@glider.be>,
 Guo Weikang <guoweikang.kernel@gmail.com>, Huacai Chen
 <chenhuacai@kernel.org>, Jan Hendrik Farr <kernel@jfarr.cc>, Jeff Xu
 <jeffxu@chromium.org>, Kees Cook <kees@kernel.org>, Masahiro Yamada
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 <rdunlap@infradead.org>, Shakeel Butt <shakeel.butt@linux.dev>, Tejun Heo
 <tj@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Thomas
 =?ISO-8859-1?Q?Wei=DFschuh?= <thomas.weissschuh@linutronix.de>,
 "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Subject: Re: [PATCH] init/main.c: Wrap long kernel cmdline when printing to
 logs
Message-Id: <20251021135553.811b77539d2d41fff3c3b992@linux-foundation.org>
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On Mon, 20 Oct 2025 13:00:22 -0700 Doug Anderson <dianders@chromium.org> wrote:

> > And the code would presumably be much simpler if we simply chunked up
> > the printing and spat out one really long line.
> 
> I'm not quite sure what you're suggesting. Before my changes we _do_
> try to spit out one really long line, but then printk() silently
> truncates it for us at 1021 characters. Re-reading your suggestion,
> I'm not sure if you're suggesting that we improve printk() to handle
> lines longer than 1021 characters by chunking them up, or if you're
> suggesting that this code could use "pr_cont()" to chunk things up.
> ...or something totally different. ;-) Can you clarify?

I was suggsting the latter - emit these really long lines via repeated
calls to printk().