linux-kernel - Re: [RFC PATCH v4 8/9] printk-rb: new functionality to support printk

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Date:   Tue, 20 Aug 2019 18:59:18 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        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>
Subject: Re: [RFC PATCH v4 8/9] printk-rb: new functionality to support printk

On (08/08/19 00:32), John Ogness wrote:
[..]
> +void prb_init(struct printk_ringbuffer *rb, char *data, int data_size_bits,
> +	      struct prb_desc *descs, int desc_count_bits,
> +	      struct wait_queue_head *waitq)
> +{
> +	struct dataring *dr = &rb->dr;
> +	struct numlist *nl = &rb->nl;
> +
> +	rb->desc_count_bits = desc_count_bits;
> +	rb->descs = descs;
> +	atomic_long_set(&descs[0].id, 0);
> +	descs[0].desc.begin_lpos = 1;
> +	descs[0].desc.next_lpos = 1;

dataring_desc_init(), perhaps?

> +	atomic_set(&rb->desc_next_unused, 1);
> +
> +	atomic_long_set(&nl->head_id, 0);
> +	atomic_long_set(&nl->tail_id, 0);
> +	nl->node = prb_desc_node;
> +	nl->node_arg = rb;
> +	nl->busy = prb_desc_busy;
> +	nl->busy_arg = rb;
> +
> +	dr->size_bits = data_size_bits;
> +	dr->data = data;
> +	atomic_long_set(&dr->head_lpos, -111 * sizeof(long));
> +	atomic_long_set(&dr->tail_lpos, -111 * sizeof(long));
> +	dr->getdesc = prb_getdesc;
> +	dr->getdesc_arg = rb;
> +
> +	atomic_long_set(&rb->fail, 0);
> +
> +	rb->wq = waitq;
> +}
> +EXPORT_SYMBOL(prb_init);

	-ss