linux-kernel - [PATCH 1/3] x86: KVM: Fix warnings by returning bool

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Date:	Sun, 27 Jan 2013 17:40:00 +0100
From:	Emil Goode <emilgoode@...il.com>
To:	mtosatti@...hat.com, gleb@...hat.com, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, avi@...hat.com, mst@...hat.com,
	perex@...ex.cz, tiwai@...e.de, crimsun@...ntu.com,
	wfp5p@...ginia.edu, peter.senna@...il.com
Cc:	x86@...nel.org, kvm@...r.kernel.org, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Emil Goode <emilgoode@...il.com>
Subject: [PATCH 1/3] x86: KVM: Fix warnings by returning bool

The function pointer x2apic_available in struct hypervisor_x86 is
supposed to point to functions that return bool. This patch changes
the return type of the kvm_para_available function to bool.

Sparse warnings:

arch/x86/kernel/kvm.c:508:35: warning:
	incorrect type in initializer (different signedness)
	arch/x86/kernel/kvm.c:508:35:
	expected bool ( *x2apic_available )( ... )
	arch/x86/kernel/kvm.c:508:35:
	got int ( static inline [toplevel] *<noident> )( ... )

arch/x86/kernel/kvm.c:508:2: warning:
	initialization from incompatible pointer type [enabled by default]

arch/x86/kernel/kvm.c:508:2: warning:
	(near initialization for ‘x86_hyper_kvm.x2apic_available’)
	[enabled by default]

Signed-off-by: Emil Goode <emilgoode@...il.com>
---
 arch/x86/include/asm/kvm_para.h |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 0be7039..695399f 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -85,13 +85,13 @@ static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
 	return ret;
 }
 
-static inline int kvm_para_available(void)
+static inline bool kvm_para_available(void)
 {
 	unsigned int eax, ebx, ecx, edx;
 	char signature[13];
 
 	if (boot_cpu_data.cpuid_level < 0)
-		return 0;	/* So we don't blow up on old processors */
+		return false;	/* So we don't blow up on old processors */
 
 	if (cpu_has_hypervisor) {
 		cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
@@ -101,10 +101,10 @@ static inline int kvm_para_available(void)
 		signature[12] = 0;
 
 		if (strcmp(signature, "KVMKVMKVM") == 0)
-			return 1;
+			return true;
 	}
 
-	return 0;
+	return false;
 }
 
 static inline unsigned int kvm_arch_para_features(void)
-- 
1.7.10.4

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