linux-kernel - [PATCH] Fix lguest w/ lockdep

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Message-Id: <1183037519.6211.2.camel@localhost.localdomain>
Date:	Thu, 28 Jun 2007 23:31:59 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Matt Mackall <mpm@...enic.com>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>
Subject: [PATCH] Fix lguest w/ lockdep

On Wed, 2007-06-27 at 19:14 -0500, Matt Mackall wrote:
> lguest: unhandled trap 14 at 0xc01362f7 (0x0)
> Dump of assembler code for function __lock_acquire:

Thanks for the bug report Matt!  I wonder if other
paravirt_disable_iospace users have the same issue...
===

Fix "lguest: unhandled trap 14 at 0xc013630f (0x0)" with CONFIG_LOCKDEP=y

paravirt_disable_iospace -> request_resource -> write_lock -> __lock_acquire()

lockdep_init() is already idempotent: simply call it before
paravirt_disable_iospace().

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff -r bea2b8147985 drivers/lguest/lguest.c
--- a/drivers/lguest/lguest.c	Thu Jun 07 22:50:36 2007 +1000
+++ b/drivers/lguest/lguest.c	Thu Jun 28 23:21:26 2007 +1000
@@ -593,6 +593,8 @@ __init void lguest_init(void *boot)
 
 	reserve_top_address(lguest_data.reserve_mem);
 
+	lockdep_init();
+
 	paravirt_disable_iospace();
 
 	cpu_detect(&new_cpu_data);


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