linux-kernel - Re: [PATCH v4 1/2] mm/memory_hotplug: Add support to accept memory during hot-add

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Message-ID: <d07cbb96-ba30-4dcf-ad14-0479d6a989f2@kernel.org>
Date: Wed, 4 Feb 2026 21:00:36 +0100
From: "David Hildenbrand (arm)" <david@...nel.org>
To: "Pratik R. Sampat" <prsampat@....com>, linux-mm@...ck.org,
 linux-coco@...ts.linux.dev, x86@...nel.org, linux-kernel@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, kas@...nel.org, ardb@...nel.org,
 akpm@...ux-foundation.org, osalvador@...e.de, thomas.lendacky@....com,
 michael.roth@....com
Subject: Re: [PATCH v4 1/2] mm/memory_hotplug: Add support to accept memory
 during hot-add

>   #endif
>   
>   static inline bool pfn_is_unaccepted_memory(unsigned long pfn)
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index a63ec679d861..549ccfd190ee 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1567,6 +1567,8 @@ int add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
>   	if (!strcmp(res->name, "System RAM"))
>   		firmware_map_add_hotplug(start, start + size, "System RAM");
>   
> +	accept_hotplug_memory(start, size);
> +
>   	/* device_online() will take the lock when calling online_pages() */
>   	mem_hotplug_done();
>   

I really hate that accepting (and un-accepting) hotplugged memory is 
different to accepting ordinary boot memory.

Is there really no way we can get a reasonable implementation where we 
just call a generic accept_memory() and it will know what to do?

-- 
Cheers,

David