linux-kernel - [PATCH] fix 32-bit compile warning from printk()

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Date:	Mon, 28 Jan 2013 11:19:39 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: [PATCH] fix 32-bit compile warning from printk()


My patch "Fix kvm's use of __pa() on percpu areas" introduced a
compile warning:

arch/x86/kernel/kvm.c: In function 'kvm_register_steal_time':
arch/x86/kernel/kvm.c:302:3: warning: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'phys_addr_t' [-Wformat]

According to: Documentation/printk-formats.txt

	If <type> is dependent on a config option for its size
	(e.g., phys_addr_t) ... use a format specifier of its
	largest possible type and explicitly cast to it.

So, we'll do just that.  We will consider it an unsigned long
long, and cast to it explicitly.

Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com>
---

 linux-2.6.git-dave/arch/x86/kernel/kvm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN arch/x86/kernel/kvm.c~fix-32-bit-compile-warning arch/x86/kernel/kvm.c
--- linux-2.6.git/arch/x86/kernel/kvm.c~fix-32-bit-compile-warning	2013-01-28 11:16:39.786938232 -0800
+++ linux-2.6.git-dave/arch/x86/kernel/kvm.c	2013-01-28 11:16:39.790938273 -0800
@@ -298,8 +298,8 @@ static void kvm_register_steal_time(void
 	memset(st, 0, sizeof(*st));
 
 	wrmsrl(MSR_KVM_STEAL_TIME, (slow_virt_to_phys(st) | KVM_MSR_ENABLED));
-	printk(KERN_INFO "kvm-stealtime: cpu %d, msr %lx\n",
-		cpu, slow_virt_to_phys(st));
+	printk(KERN_INFO "kvm-stealtime: cpu %d, msr %llx\n",
+		cpu, (unsigned long long)slow_virt_to_phys(st));
 }
 
 static DEFINE_PER_CPU(unsigned long, kvm_apic_eoi) = KVM_PV_EOI_DISABLED;
_

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