Through a labyrinthian sequence of includes, usage of virt_to_phys() 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/misc/vmw_balloon.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index 5e6be1527571..b837e7eba5f7 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -17,6 +17,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/types.h> +#include <linux/io.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/vmalloc.h> -- 2.24.0
