linux-kernel - [PATCH printk v2 0/1] allow unsafe write

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Message-ID: <20251027161212.334219-1-john.ogness@linutronix.de>
Date: Mon, 27 Oct 2025 17:18:02 +0106
From: John Ogness <john.ogness@...utronix.de>
To: Petr Mladek <pmladek@...e.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Breno Leitao <leitao@...ian.org>,
	Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH printk v2 0/1] allow unsafe write_atomic()

This is v2 of a series to allow unsafe write_atomic() console
callback implementations. This will allow console drivers to
move to the nbcon API, even if they are not capable of NMI-safe
atomic writing. The primary motivation for this series is to
support netconsole. v1 is here [0].

This version is based on the rework/nbcon-in-kdb branch of the
printk git in order to avoid conflicts due to the
console_is_usable() relocation.

The changes since v1:

- Use a global variable to track exactly when it is allowed to
  flush using an unsafe write_atomic() rather than sprinkling
  around similar checks based on states and code paths.

- Remove evil and incorrect WARN_ON() detection in
  nbcon_emit_next_record().

John Ogness

[0] https://lore.kernel.org/lkml/20250912121852.2666874-1-john.ogness@linutronix.de

John Ogness (1):
  printk: nbcon: Allow unsafe write_atomic() for panic

 include/linux/console.h | 19 ++++++++++++++---
 kernel/printk/nbcon.c   | 45 ++++++++++++++++++++++++++++-------------
 2 files changed, 47 insertions(+), 17 deletions(-)


base-commit: 62627bf0cadf6eae87d92fecf604c42160fe16ef
-- 
2.47.3