The code uses __is_defined, which only works for undefined macros and defined ones with a value. This is different than the debugging prints that accept empty defined DEBUG, so add a commented out #define DEBUG 1 to alert those seeking to debug the code. Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> --- drivers/block/efi-block-io.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/block/efi-block-io.c b/drivers/block/efi-block-io.c index eb4981e86298..668eac9d75f0 100644 --- a/drivers/block/efi-block-io.c +++ b/drivers/block/efi-block-io.c @@ -1,4 +1,6 @@ // SPDX-License-Identifier: GPL-2.0-only + +// #define DEBUG 1 #include <common.h> #include <driver.h> #include <init.h> -- 2.39.2