linux-kernel - Re: [PATCH/RFC v5 4/5]: core: Add dump device to call on oopses and panics

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Date:	Mon, 30 Nov 2009 10:27:27 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	dedekind1@...il.com
Cc:	Jörn Engel <joern@...fs.org>,
	Simon Kagstrom <simon.kagstrom@...insight.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Koskinen Aaro (Nokia-D/Helsinki)" <aaro.koskinen@...ia.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH/RFC v5 4/5]: core: Add dump device to call on oopses
 and panics

On Mon, 2009-11-30 at 10:23 +0000, David Woodhouse wrote:
> +       /* Theoretically, the log could move on after we do this, but
> +          there's not a log we can do about that. The new messages
> +          will overwrite the start of what we dump. */
> +       spin_lock_irqsave(&logbuf_lock, flags);
> +       end = log_end & LOG_BUF_MASK;
> +       chars = logged_chars;
> +       spin_unlock_irqrestore(&logbuf_lock, flags); 

Actually that's not true -- we _could_ hold the logbuf_lock until the
end of the function. Not entirely sure we _want_ to though...

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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