linux-kernel - [PATCH 1/8] KVM: Use boot_cpu_data instead of current_cpu

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Message-Id: <20061228100817.3B6042500F7@il.qumranet.com>
Date:	Thu, 28 Dec 2006 10:08:17 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, mingo@...e.hu
Subject: [PATCH 1/8] KVM: Use boot_cpu_data instead of current_cpu_data

current_cpu_data invokes smp_processor_id(), which is inadvisable when
preemption is enabled.  Switch to boot_cpu_data instead.

Resolves sourceforge bug 1621401.

Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/svm.c
===================================================================
--- linux-2.6.orig/drivers/kvm/svm.c
+++ linux-2.6/drivers/kvm/svm.c
@@ -246,7 +246,7 @@ static int has_svm(void)
 {
 	uint32_t eax, ebx, ecx, edx;
 
-	if (current_cpu_data.x86_vendor != X86_VENDOR_AMD) {
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) {
 		printk(KERN_INFO "has_svm: not amd\n");
 		return 0;
 	}
-
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