Through a labyrinthian sequence of includes, usage of page_to_phys(), virt_to_phys() and out*() is dependent on the include of asm/io.h in x86's asm/realmode.h, which is included in x86's asm/acpi.h and thus by linux/acpi.h. Explicitly include linux/io.h to break the dependency on realmode.h so that a future patch can remove the realmode.h include from acpi.h without breaking the build. Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> --- drivers/virt/vboxguest/vboxguest_core.c | 1 + drivers/virt/vboxguest/vboxguest_utils.c | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/virt/vboxguest/vboxguest_core.c b/drivers/virt/vboxguest/vboxguest_core.c index 2307b0329aec..d823d558c0c4 100644 --- a/drivers/virt/vboxguest/vboxguest_core.c +++ b/drivers/virt/vboxguest/vboxguest_core.c @@ -6,6 +6,7 @@ */ #include <linux/device.h> +#include <linux/io.h> #include <linux/mm.h> #include <linux/sched.h> #include <linux/sizes.h> diff --git a/drivers/virt/vboxguest/vboxguest_utils.c b/drivers/virt/vboxguest/vboxguest_utils.c index 75fd140b02ff..80e0f1254476 100644 --- a/drivers/virt/vboxguest/vboxguest_utils.c +++ b/drivers/virt/vboxguest/vboxguest_utils.c @@ -7,6 +7,7 @@ */ #include <linux/errno.h> +#include <linux/io.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> -- 2.24.0
