On Mon, Nov 02, 2020 at 10:23:20AM +0100, David Hildenbrand wrote: > > > int __init kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address, > > unsigned numpages, unsigned long page_flags) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > > index 14e397f3752c..ab0ef6bd351d 100644 > > --- a/include/linux/mm.h > > +++ b/include/linux/mm.h > > @@ -2924,7 +2924,11 @@ static inline bool debug_pagealloc_enabled_static(void) > > return static_branch_unlikely(&_debug_pagealloc_enabled); > > } > > -#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_ARCH_HAS_SET_DIRECT_MAP) > > +#ifdef CONFIG_DEBUG_PAGEALLOC > > +/* > > + * To support DEBUG_PAGEALLOC architecture must ensure that > > + * __kernel_map_pages() never fails > > Maybe add here, that this implies mapping everything via PTEs during boot. This is more of an implementation detail, while assumption that __kernel_map_pages() does not fail is somewhat a requirement :) > Acked-by: David Hildenbrand <david@xxxxxxxxxx> Thanks! > -- > Thanks, > > David / dhildenb > -- Sincerely yours, Mike.
