linux-kernel - Re: [RFC PATCH v5 2/3] printk-rb: new printk ringbuffer implementation (reader)

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Message-ID: <87a788fcdr.fsf@linutronix.de>
Date:   Wed, 04 Dec 2019 14:28:48 +0100
From:   John Ogness <john.ogness@...utronix.de>
To:     Petr Mladek <pmladek@...e.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        kexec@...ts.infradead.org
Subject: Re: [RFC PATCH v5 2/3] printk-rb: new printk ringbuffer implementation (reader)

On 2019-12-04, Petr Mladek <pmladek@...e.com> wrote:
>> +	} else if ((DATA_WRAPS(data_ring, blk_lpos->begin) + 1 ==
>> +		    DATA_WRAPS(data_ring, blk_lpos->next)) ||
>> +		   ((DATA_WRAPS(data_ring, blk_lpos->begin) ==
>> +		     DATA_WRAPS(data_ring, -1UL)) &&
>> +		    (DATA_WRAPS(data_ring, blk_lpos->next) == 0))) {
>
> I wonder if the following might be easier to understand even for
> people like me ;-)
>
> 	} else if (DATA_WRAPS(data_ring, blk_lpos->begin + DATA_SIZE(data_ring)) ==
> 		    DATA_WRAPS(data_ring, blk_lpos->next)) {

Yes, this is clear and covers both cases. Thanks.

John