linux-kernel - Re: [PATCH][next] printk: ringbuffer: support dataless records

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Date:   Tue, 21 Jul 2020 12:36:55 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        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>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marco Elver <elver@...gle.com>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] printk: ringbuffer: support dataless records

On 2020-07-21, Sergey Senozhatsky <sergey.senozhatsky@...il.com> wrote:
>> @@ -1402,7 +1396,9 @@ static int prb_read(struct printk_ringbuffer *rb, u64 seq,
>>  	/* Copy text data. If it fails, this is a data-less record. */
>>  	if (!copy_data(&rb->text_data_ring, &desc.text_blk_lpos, desc.info.text_len,
>>  		       r->text_buf, r->text_buf_size, line_count)) {
>> -		return -ENOENT;
>> +		/* Report an error if there should have been data. */
>> +		if (desc.info.text_len != 0)
>> +			return -ENOENT;
>>  	}
>
> If this is a dataless record then should copy_data() return error?

You are correct. That makes more sense. I will send a v2.

John Ogness