linux-kernel - [PATCH] x86-64: fix HYPERVISOR_update

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Message-Id: <4947A108.76E4.0078.0@novell.com>
Date:	Tue, 16 Dec 2008 11:37:28 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	<mingo@...e.hu>, <tglx@...utronix.de>,
	<linux-kernel@...r.kernel.org>, <hpa@...or.com>
Subject: [PATCH] x86-64: fix HYPERVISOR_update_descriptor()

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 arch/x86/include/asm/xen/hypercall.h |    2 ++
 1 file changed, 2 insertions(+)

--- linux-2.6.28-rc8/arch/x86/include/asm/xen/hypercall.h	2008-12-11 14:45:37.000000000 +0100
+++ 2.6.28-rc8-x86_64-xen-update-descr/arch/x86/include/asm/xen/hypercall.h	2008-12-12 10:25:55.000000000 +0100
@@ -290,6 +290,8 @@ HYPERVISOR_get_debugreg(int reg)
 static inline int
 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 {
+	if (sizeof(u64) == sizeof(long))
+		return _hypercall2(int, update_descriptor, ma, desc);
 	return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 }
 



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