linux-kernel - Re: [kerneloops] regression in 2.6.27 wrt "lock

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Message-ID: <20081013164000.04fab4c2@lxorguk.ukuu.org.uk>
Date:	Mon, 13 Oct 2008 16:40:00 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Karel Zak <kzak@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [kerneloops] regression in 2.6.27 wrt "lock_page" and the
 "hwclock" program

> The warning occurs because hwclock uses this dubious sequence of
> code to run "atomic" code:

Nobody should be using old versions of hwclock that do this as they are
not SMP safe.

> So instead just enable interrupts in the pagefault path unconditionally
> if we come from user-space, and handle the fault.

This should definitely also log an error to get users to remove that
rubbish from their PC
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