linux-kernel - Re: misc nits Re: [PATCH 1/2] printk: add lockless buffer

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Date:   Mon, 02 Mar 2020 04:17:18 -0800
From:   Joe Perches <joe@...ches.com>
To:     John Ogness <john.ogness@...utronix.de>,
        Petr Mladek <pmladek@...e.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Parri <parri.andrea@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: misc nits Re: [PATCH 1/2] printk: add lockless buffer

On Mon, 2020-03-02 at 11:38 +0100, John Ogness wrote:
> On 2020-02-21, Petr Mladek <pmladek@...e.com> wrote:
> > > diff --git a/kernel/printk/printk_ringbuffer.c b/kernel/printk/printk_ringbuffer.c
[]
> > > +static struct prb_data_block *to_block(struct prb_data_ring *data_ring,
> > > +				       unsigned long begin_lpos)
> > > +{
> > > +	char *data = &data_ring->data[DATA_INDEX(data_ring, begin_lpos)];
> > > +
> > > +	return (struct prb_data_block *)data;
> > 
> > Nit: Please, use "blk" instead of "data". I was slightly confused
> > because "data" is also one member of struct prb_data_block.
> 
> OK.

trivia:

Perhaps use void * instead of char * and a direct return
and avoid the naming altogether.

static struct prb_data_block *to_block(struct prb_data_ring *data_ring, 
				       unsigned long begin_lpos)
{
	return (void *)&data_ring->data[DATA_INDEX(data_ring, begin_lpos)];
}