x86/xen: Remove undefined behavior in setup_features()

[ Upstream commit ecb6237fa397b7b810d798ad19322eca466dbab1 ]

1 << 31 is undefined. So switch to 1U << 31.

Fixes: 5ead97c84fa7 ("xen: Core Xen implementation")
Signed-off-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20220617103037.57828-1-julien@xen.org
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/xen/features.c b/drivers/xen/features.c
index 7b59144..87f1828 100644 (file)
--- a/drivers/xen/features.c
+++ b/drivers/xen/features.c
@@ -42,7 +42,7 @@ void xen_setup_features(void)
                if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0)
                        break;
                for (j = 0; j < 32; j++)
-                       xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
+                       xen_features[i * 32 + j] = !!(fi.submap & 1U << j);
        }
 
        if (xen_pv_domain()) {