linux-kernel - Re: [PATCH printk v1 02/13] printk: cpu sync always disable interrupts

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Message-ID: <Ygn4aw7NObuVf2Lu@google.com>
Date:   Mon, 14 Feb 2022 15:36:27 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     John Ogness <john.ogness@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH printk v1 02/13] printk: cpu sync always disable
 interrupts

On (22/02/11 13:58), Petr Mladek wrote:
> On Mon 2022-02-07 20:49:12, John Ogness wrote:
> > The CPU sync functions are a NOP for !CONFIG_SMP. But for
> > !CONFIG_SMP they still need to disable interrupts in order to
> > preserve context within the CPU sync sections.
> > 
> > Signed-off-by: John Ogness <john.ogness@...utronix.de>
> 
> Good catch!
> 
> It is interesting that the original code did not disable interrupts
> around __dump_stack() on non-SMP, see the commit 766c268bc6d39b8124
> ("lib/dump_stack: move cpu lock to printk.c"). But it was rather
> a bug. The patch makes perfect sense.
> 
> Reviewed-by: Petr Mladek <pmladek@...e.com>

Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org>