linux-kernel - Re: [RFC PATCH v5 1/3] printk-rb: new printk ringbuffer implementation (writer)

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Message-ID: <20191209074249.GC88619@google.com>
Date:   Mon, 9 Dec 2019 16:42:50 +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>,
        kexec@...ts.infradead.org
Subject: Re: [RFC PATCH v5 1/3] printk-rb: new printk ringbuffer
 implementation (writer)

On (19/11/28 02:58), John Ogness wrote:
[..]
> +
> +#define _DATA_SIZE(sz_bits)		(1UL << (sz_bits))
> +#define _DESCS_COUNT(ct_bits)		(1U << (ct_bits))
> +#define DESC_SV_BITS			(sizeof(int) * 8)
> +#define DESC_COMMITTED_MASK		(1U << (DESC_SV_BITS - 1))

What does SV state for? State Value?

	-ss