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 for kexec@lists.infradead.org; Mon, 29 Mar 2021 15:13:57 +0000
From: John Ogness <john.ogness@linutronix.de>
Subject: Re: [PATCH next v1 2/3] printk: remove safe buffers
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Date: Mon, 29 Mar 2021 17:13:30 +0200
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To: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>, Sergey Senozhatsky <sergey.senozhatsky@gmail.com>, Steven Rostedt <rostedt@goodmis.org>, Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Eric Biederman <ebiederm@xmission.com>, Nicholas Piggin <npiggin@gmail.com>, Christophe Leroy <christophe.leroy@csgroup.eu>, Alistair Popple <alistair@popple.id.au>, Jordan Niethe <jniethe5@gmail.com>, Peter Zijlstra <peterz@infradead.org>, =?utf-8?Q?C?= =?utf-8?Q?=C3=A9dric?= Le Goater <clg@kaod.org>, Andrew Morton <akpm@linux-foundation.org>, Kees Cook <keescook@chromium.org>, Yue Hu <huyue2@yulong.com>, Alexey Kardashevskiy <aik@ozlabs.ru>, Rafael Aquini <aquini@redhat.com>, Tiezhu Yang <yangtiezhu@loongson.cn>, "Guilherme G.
 Piccoli" <gpiccoli@canonical.com>, "Paul E. McKenney" <paulmck@kernel.org>, linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org

On 2021-03-29, John Ogness <john.ogness@linutronix.de> wrote:
>> Will you call console write() callback with irq enabled from the
>> kthread?
>
> No. That defeats the fundamental purpose of this entire rework
> excercise. ;-)

Sorry, I misread your question. The answer is "yes". We want to avoid a
local_irq_save() when calling into console->write().

John Ogness

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