linux-kernel - Re: [PATCH] mm, page_alloc: really disable DEBUG

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Message-ID: <b0cf875b-6ff5-2b5c-8b3d-6dc6c75b8be8@redhat.com>
Date:   Wed, 19 May 2021 17:30:35 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Akinobu Mita <akinobu.mita@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Andrea Righi <andrea.righi@...onical.com>,
        Guilherme Piccoli <gpiccoli@...onical.com>
Subject: Re: [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with
 hibernation

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@...onical.com>
> ---
>   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