linux-kernel - [PATCH 0/3] mm/memory_hotplug: fixes for memory hotplug altmap support

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Message-Id: <20231120072317.3169630-1-sumanthk@linux.ibm.com>
Date:   Mon, 20 Nov 2023 08:23:14 +0100
From:   Sumanth Korikkar <sumanthk@...ux.ibm.com>
To:     linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>
Cc:     Oscar Salvador <osalvador@...e.de>, Michal Hocko <mhocko@...e.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        linux-s390 <linux-s390@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/3] mm/memory_hotplug: fixes for memory hotplug altmap support

Patch 1  adds  the missing lock  in memory hotplug operations,
ensuring that the mem_hotplug_lock is held during critical operations
like mhp_init_memmap_on_memory() and mhp_deinit_memmap_on_memory()

Patch 2 deals with error handling in add_memory_resource() and considers
the possibility of altmap support. This ensures proper deallocation of
struct pages, aligning with the allocation strategy.

Patch 3 relocates the vmem_altmap code to sparse-vmemmap.c, enabling the
utilization of vmem_altmap_free() and vmem_altmap_offset() without the
dependency on CONFIG_ZONE_DEVICE.

Changes since patch series "implement "memmap on memory" feature on
s390":
Feedback from David:
Patch 1:
* Fixed subject for memory hotplug lock.
* Added locking comments before
  memory_block_online()/memory_block_offline().
Patch 2:
* Fixed Fixes-by commit.

lkp report:
Patch 3:
* when CONFIG_SPARSEMEM_VMEMMAP is disabled, resolve
  undefined reference to `vmem_altmap_offset' error.
* Request for Reviewed-by once again due to the change in patch3.

Thank you

Sumanth Korikkar (3):
  mm/memory_hotplug: add missing mem_hotplug_lock
  mm/memory_hotplug: fix error handling in add_memory_resource()
  mm: use vmem_altmap code without CONFIG_ZONE_DEVICE

 drivers/base/memory.c    | 18 +++++++++++++++---
 include/linux/memremap.h | 12 ------------
 include/linux/mm.h       | 15 +++++++++++++++
 mm/memory_hotplug.c      | 15 +++++++--------
 mm/memremap.c            | 14 +-------------
 mm/sparse-vmemmap.c      | 13 +++++++++++++
 6 files changed, 51 insertions(+), 36 deletions(-)

-- 
2.41.0