linux-kernel - Re: [RFC][PATCH 6/7] printk: use alternative printk buffers

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Date:   Mon, 3 Oct 2016 16:53:15 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Jan Kara <jack@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Calvin Owens <calvinowens@...com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 6/7] printk: use alternative printk buffers

On (09/30/16 13:15), Petr Mladek wrote:
[..]
> > and the decision was to keep `unsigned long flags' on stack in the
> > alt_enter/exit caller. besides in most of the cases we already have
> > it (in vprintk_emit() and console_unlock()).
> 
> I would pass the pointer to flags as alt_enter() parameter.

I think I'll do something like this

--

void __alt_printk_enter(void);
void __alt_printk_exit(void);

#define alt_printk_enter(flags)			\
	do {					\
		local_irq_save(flags);		\
		__alt_printk_enter();		\
	} while (0)

#define alt_printk_exit(flags) 			\
	do { 					\
		__alt_printk_exit();		\
		local_irq_restore(flags);	\
	} while (0)

--

seems that this mostly will fit our needs in printk().
for anything that does not fit -- we have __alt_printk_enter()/exit().


and I'll also extend alt_printk more, some additional paths.

I'm also thinking about your rename proposal, but didn't find
a perfect name yet.

	-ss