x86, xen: Initialize cx to suppress warning

Initialize cx before calling xen_cpuid(), in order to suppress the
"may be used uninitialized in this function" warning.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 0b755cd..eb33aaa 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -215,6 +215,7 @@ static __init void xen_init_cpuid_mask(void)
                          (1 << X86_FEATURE_ACPI));  /* disable ACPI */
 
        ax = 1;
+       cx = 0;
        xen_cpuid(&ax, &bx, &cx, &dx);
 
        /* cpuid claims we support xsave; try enabling it to see what happens */