linux-kernel - Re: [PATCH v2 02/32] kho: mm: Don't allow deferred struct page with KHO

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Message-ID: <aIdNh-qqSqSUIr2V@kernel.org>
Date: Mon, 28 Jul 2025 13:14:31 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: Re: [PATCH v2 02/32] kho: mm: Don't allow deferred struct page with
 KHO

On Wed, Jul 23, 2025 at 02:46:15PM +0000, Pasha Tatashin wrote:
> KHO uses struct pages for the preserved memory early in boot, however,
> with deferred struct page initialization, only a small portion of
> memory has properly initialized struct pages.
> 
> This problem was detected where vmemmap is poisoned, and illegal flag
> combinations are detected.
> 
> Don't allow them to be enabled together, and later we will have to
> teach KHO to work properly with deferred struct page init kernel
> feature.
> 
> Fixes: 990a950fe8fd ("kexec: add config option for KHO")
> 
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>

Acked-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

> ---
>  kernel/Kconfig.kexec | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
> index 2ee603a98813..1224dd937df0 100644
> --- a/kernel/Kconfig.kexec
> +++ b/kernel/Kconfig.kexec
> @@ -97,6 +97,7 @@ config KEXEC_JUMP
>  config KEXEC_HANDOVER
>  	bool "kexec handover"
>  	depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE
> +	depends on !DEFERRED_STRUCT_PAGE_INIT
>  	select MEMBLOCK_KHO_SCRATCH
>  	select KEXEC_FILE
>  	select DEBUG_FS
> -- 
> 2.50.0.727.gbf7dc18ff4-goog
> 

-- 
Sincerely yours,
Mike.