From: Konrad Rzeszutek Wilk Date: Thu, 29 Sep 2011 17:06:42 +0000 (-0400) Subject: xen/enlighten: Fix compile warnings and set cx to known value. X-Git-Tag: firefly_0821_release~3680^2~4337^2~2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5e287830136a8edb76e9f9c432b264d99833172f;p=firefly-linux-kernel-4.4.55.git xen/enlighten: Fix compile warnings and set cx to known value. We get: linux/arch/x86/xen/enlighten.c: In function ‘xen_start_kernel’: linux/arch/x86/xen/enlighten.c:226: warning: ‘cx’ may be used uninitialized in this function linux/arch/x86/xen/enlighten.c:240: note: ‘cx’ was declared here and the cx is really not set but passed in the xen_cpuid instruction which masks the value with returned masked_ecx from cpuid. This can potentially lead to invalid data being stored in cx. Signed-off-by: Konrad Rzeszutek Wilk --- diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 2d69617950f7..da8afd576a6b 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -251,6 +251,7 @@ static void __init xen_init_cpuid_mask(void) ~((1 << X86_FEATURE_APIC) | /* disable local APIC */ (1 << X86_FEATURE_ACPI)); /* disable ACPI */ ax = 1; + cx = 0; xen_cpuid(&ax, &bx, &cx, &dx); xsave_mask =