linux-kernel - Re: [RFC][PATCHv3 3/6] printk: introduce per-cpu safe

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Message-ID: <20161018124657.76aef295@gandalf.local.home>
Date:   Tue, 18 Oct 2016 12:46:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, Tejun Heo <tj@...nel.org>,
        Calvin Owens <calvinowens@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [RFC][PATCHv3 3/6] printk: introduce per-cpu safe_print seq
 buffer

On Wed, 19 Oct 2016 00:40:42 +0900
Sergey Senozhatsky <sergey.senozhatsky@...il.com> wrote:


> +
> +/*
> + * Returns with local IRQs disabled.
> + * Can be preempted by NMI.

It does? How does it return with IRQs disabled?

> + */
> +void __printk_safe_enter(void)
> +{
> +	this_cpu_inc(printk_safe_context);
> +}
> +
> +/*
> + * Restores local IRQs state saved in printk_safe_enter().
> + * Can be preempted by NMI.
> + */

How does this return with irqs enabled?

-- Steve

> +void __printk_safe_exit(void)
> +{
> +	this_cpu_dec(printk_safe_context);
> +}
> +