From: John Ogness <john.ogness@linutronix.de>
To: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Stephen Rothwell <sfr@canb.auug.org.au>,
Andrew Morton <akpm@linux-foundation.org>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Stephen Boyd <swboyd@chromium.org>,
Alexander Potapenko <glider@google.com>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH next v3 1/2] dump_stack: move cpu lock to printk.c
Date: Tue, 15 Jun 2021 23:39:23 +0206 [thread overview]
Message-ID: <8735tiq0d8.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <20210615174947.32057-2-john.ogness@linutronix.de>
On 2021-06-15, John Ogness <john.ogness@linutronix.de> wrote:
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index 114e9963f903..5369d8f33299 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -3532,3 +3532,70 @@ void kmsg_dump_rewind(struct kmsg_dump_iter *iter)
> EXPORT_SYMBOL_GPL(kmsg_dump_rewind);
>
> #endif
> +
> +#ifdef CONFIG_SMP
> +static atomic_t printk_cpulock_owner = ATOMIC_INIT(-1);
> +static bool printk_cpulock_nested;
I just realized that @printk_cpulock_nested will need to be an atomic_t
counter to allow multiple nested levels since nesting can also occur
because of recursion and not only because of an interrupting NMI
context. So a v4 will be needed for that simple change. But please still
comment on the rest.
Thanks.
John Ogness
next prev parent reply other threads:[~2021-06-15 21:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-15 17:49 [PATCH next v3 0/2] introduce printk cpu lock John Ogness
2021-06-15 17:49 ` [PATCH next v3 1/2] dump_stack: move cpu lock to printk.c John Ogness
2021-06-15 21:33 ` John Ogness [this message]
2021-06-16 7:06 ` Sergey Senozhatsky
2021-06-16 7:29 ` John Ogness
2021-06-16 11:21 ` Petr Mladek
2021-06-16 13:40 ` John Ogness
2021-06-16 11:55 ` Sergey Senozhatsky
2021-06-15 17:49 ` [PATCH next v3 2/2] printk: fix cpu lock ordering John Ogness
2021-06-16 11:30 ` Petr Mladek
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