Re: [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation

[David Hildenbrand]

On 19.05.21 17:28, Krzysztof Kozlowski wrote:
> The documentation of DEBUG_PAGEALLOC states that it cannot be used with
> hibernation, however the Kconfig entry would allow it if
> ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC.
>
> Fixes: ee3b4290aec0 ("generic debug pagealloc: build fix")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
> ---
>   mm/Kconfig.debug | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
> index 1e73717802f8..0ace5b2a9d04 100644
> --- a/mm/Kconfig.debug
> +++ b/mm/Kconfig.debug
> @@ -11,7 +11,7 @@ config PAGE_EXTENSION
>   config DEBUG_PAGEALLOC
>   	bool "Debug page memory allocations"
>   	depends on DEBUG_KERNEL
> -	depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
> +	depends on !HIBERNATION && ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
>   	select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
>   	help
>   	  Unmap pages from the kernel linear mapping after free_pages().

I remember this should be working now, as we temporarily map the pages 
in the direct map when hibernating?

--
Thanks,

David / dhildenb