Re: [PATCH v8 1/2] kho: fix deferred initialization of scratch areas

[Mike Rapoport <rppt@kernel.org>]

On Thu, Apr 16, 2026 at 05:06:10PM +0200, Michał Cłapiński wrote:
> On Thu, Apr 16, 2026 at 4:45 PM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > Hi Michal,
> >
> > On Thu, Apr 16, 2026 at 01:06:53PM +0200, Michal Clapinski wrote:
> > > @@ -2262,6 +2253,12 @@ static void __init memmap_init_reserved_range(phys_addr_t start,
> > >                * access it yet.
> > >                */
> > >               __SetPageReserved(page);
> > > +
> > > +#ifdef CONFIG_MEMBLOCK_KHO_SCRATCH
> >
> > No need for #ifdef here, there's a stub returning false for
> > CONFIG_MEMBLOCK_KHO_SCRATCH=n case.
> 
> In all 3 places the #ifdef is there because MIGRATE_CMA might be
> undefined. I already broke mm-new branch in the past because of that.

Hmm, that hurts :/

The best I can think of is to add a static inline in memblock.h and ifdefs
around it.

> > > +             if (memblock_is_kho_scratch_memory(PFN_PHYS(pfn)) &&
> > > +                 pageblock_aligned(pfn))
> > > +                     init_pageblock_migratetype(page, MIGRATE_CMA, false);
> > > +#endif
> > >       }
> > >  }

-- 
Sincerely yours,
Mike.