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From: John Ogness <john.ogness@linutronix.de>
Subject: Re: [PATCH][next] printk: ringbuffer: support dataless records
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Date: Tue, 21 Jul 2020 12:36:55 +0206
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To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Petr Mladek <pmladek@suse.com>, Marco Elver <elver@google.com>, Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>, Peter Zijlstra <peterz@infradead.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>, Sergey Senozhatsky <sergey.senozhatsky@gmail.com>, Thomas Gleixner <tglx@linutronix.de>, Linus Torvalds <torvalds@linux-foundation.org>

On 2020-07-21, Sergey Senozhatsky <sergey.senozhatsky@gmail.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

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