linux-kernel - [PATCH 1/9] um: disable CMPXCHG

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Message-Id: <1314634419-24766-2-git-send-email-richard@nod.at>
Date:	Mon, 29 Aug 2011 18:13:31 +0200
From:	Richard Weinberger <richard@....at>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net,
	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>,
	Christoph Lameter <cl@...ux.com>,
	Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>
Subject: [PATCH 1/9] um: disable CMPXCHG_DOUBLE as it breaks UML build

From: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>

Commit b789ef518b2a7231b0668c813f677cee528a9d3f tests for cmpxchg_double
support in the SLUB code and it breaks UML builds with SLUB. Since UML
does not support checking for CPU features, disable CMPXCHG_DOUBLE just
like CMPXCHG_LOCAL is disabled for UML.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Jeff Dike <jdike@...toit.com>
Cc: Richard Weinberger <richard@....at>
Signed-off-by: Richard Weinberger <richard@....at>
---
 arch/um/Kconfig.x86 |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/um/Kconfig.x86 b/arch/um/Kconfig.x86
index d31ecf3..21bebe6 100644
--- a/arch/um/Kconfig.x86
+++ b/arch/um/Kconfig.x86
@@ -10,6 +10,10 @@ config CMPXCHG_LOCAL
 	bool
 	default n
 
+config CMPXCHG_DOUBLE
+	bool
+	default n
+
 source "arch/x86/Kconfig.cpu"
 
 endmenu
-- 
1.7.6.1

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