On Thu, Jun 4, 2020 at 9:58 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > but if we ever lose the 1 then the above will silently compile the code > within the IS_ENABLED() section out. Yeah, I believe `IS_ENABLED()` is only meant for Kconfig symbols, not macro defs in general. A better option would be `__is_defined()` which works for defined-to-nothing too. Cheers, Miguel