From: David Hildenbrand <david@redhat.com>
To: Sumanth Korikkar <sumanthk@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-s390 <linux-s390@vger.kernel.org>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>
Subject: Re: [PATCH v2 4/4] mm/memory_hotplug: Remove MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers
Date: Thu, 9 Oct 2025 21:03:31 +0200 [thread overview]
Message-ID: <da27231d-e8dc-41f1-b5bd-e32b5eed52f3@redhat.com> (raw)
In-Reply-To: <20251009131839.3739108-5-sumanthk@linux.ibm.com>
On 09.10.25 15:18, Sumanth Korikkar wrote:
> MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE memory notifiers were introduced
> to prepare the transition of memory to and from a physically accessible
> state. This enhancement was crucial for implementing the "memmap on memory"
> feature for s390.
>
> With introduction of dynamic (de)configuration of hotpluggable memory,
> memory can be brought to accessible state before add_memory(). Memory
> can be brought to inaccessible state before remove_memory(). Hence,
> there is no need of MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE memory
> notifiers anymore.
>
> This basically reverts commit
> c5f1e2d18909 ("mm/memory_hotplug: introduce MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers")
> Additionally, apply minor adjustments to the function parameters of
> move_pfn_range_to_zone() and mhp_supports_memmap_on_memory() to ensure
> compatibility with the latest branch.
>
> Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
> ---
Acked-by: David Hildenbrand <david@redhat.com>
--
Cheers
David / dhildenb
next prev parent reply other threads:[~2025-10-09 19:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-09 13:18 [PATCH v2 0/4] Support dynamic (de)configuration of memory Sumanth Korikkar
2025-10-09 13:18 ` [PATCH v2 1/4] s390/mm: Support removal of boot-allocated virtual memory map Sumanth Korikkar
2025-10-09 13:18 ` [PATCH v2 2/4] s390/sclp: Add support for dynamic (de)configuration of memory Sumanth Korikkar
2025-10-09 19:13 ` David Hildenbrand
2025-10-10 8:09 ` Sumanth Korikkar
2025-10-10 8:16 ` David Hildenbrand
2025-10-09 13:18 ` [PATCH v2 3/4] s390/sclp: Remove MHP_OFFLINE_INACCESSIBLE Sumanth Korikkar
2025-10-09 13:18 ` [PATCH v2 4/4] mm/memory_hotplug: Remove MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers Sumanth Korikkar
2025-10-09 19:03 ` David Hildenbrand [this message]
2025-10-10 8:24 ` [PATCH v2 0/4] Support dynamic (de)configuration of memory Heiko Carstens
2025-10-10 9:02 ` David Hildenbrand
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