[PATCH v3 3/4] arch, mm: restore dependency of __kernel_map_pages() of DEBUG_PAGEALLOC

[David Hildenbrand]

>   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.

Acked-by: David Hildenbrand <david at redhat.com>

-- 
Thanks,

David / dhildenb