Picked some outdated address from Masahiro, so once again:
On Tue, May 23, 2023 at 11:40:34AM +0200, Ahmad Fatoum wrote:
> 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>
> ---
> common/efi/payload/iomem.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/common/efi/payload/iomem.c b/common/efi/payload/iomem.c
> index 6b92ca993aa7..550d832668ed 100644
> --- a/common/efi/payload/iomem.c
> +++ b/common/efi/payload/iomem.c
> @@ -3,6 +3,7 @@
>
> #define pr_fmt(fmt) "efi-iomem: " fmt
>
> +// #define DEBUG 1
I don't like this very much.
Generally being able to do this is really appealing:
if (__is_defined(DEBUG))
...
Indeed this is so appealing that others may copy this. Having to
remember then that there's a subtle difference between __is_defined() and
#ifdef is not so nice though.
We could add
#define __ARG_PLACEHOLDER_ 0,
to include/linux/kconfig.h. With this __is_defined() and #ifdef should
do the same thing. It would even better to add this to the Linux
upstream version of this file. I am not sure though if that has any
unwanted side effects. Masahiro, do you have an opinion about this?
Another option would be to add this somewhere:
#ifdef DEBUG
#undef DEBUG
#define DEBUG 1
#endif
Sascha
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