The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x f42ce5f087eb69e47294ababd2e7e6f88a82d308 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023120918-qualify-refutable-6c2a@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
f42ce5f087eb ("mm/memory_hotplug: fix error handling in add_memory_resource()") 1a8c64e11043 ("mm/memory_hotplug: embed vmem_altmap details in memory block") 2d1f649c7c08 ("mm/memory_hotplug: support memmap_on_memory when memmap is not aligned to pageblocks") 85a2b4b08f20 ("mm/memory_hotplug: allow architecture to override memmap on memory support check") e3c2bfdd33a3 ("mm/memory_hotplug: allow memmap on memory hotplug request to fallback")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From f42ce5f087eb69e47294ababd2e7e6f88a82d308 Mon Sep 17 00:00:00 2001 From: Sumanth Korikkar sumanthk@linux.ibm.com Date: Mon, 20 Nov 2023 15:53:53 +0100 Subject: [PATCH] mm/memory_hotplug: fix error handling in add_memory_resource()
In add_memory_resource(), creation of memory block devices occurs after successful call to arch_add_memory(). However, creation of memory block devices could fail. In that case, arch_remove_memory() is called to perform necessary cleanup.
Currently with or without altmap support, arch_remove_memory() is always passed with altmap set to NULL during error handling. This leads to freeing of struct pages using free_pages(), eventhough the allocation might have been performed with altmap support via altmap_alloc_block_buf().
Fix the error handling by passing altmap in arch_remove_memory(). This ensures the following: * When altmap is disabled, deallocation of the struct pages array occurs via free_pages(). * When altmap is enabled, deallocation occurs via vmem_altmap_free().
Link: https://lkml.kernel.org/r/20231120145354.308999-3-sumanthk@linux.ibm.com Fixes: a08a2ae34613 ("mm,memory_hotplug: allocate memmap from the added memory range") Signed-off-by: Sumanth Korikkar sumanthk@linux.ibm.com Reviewed-by: Gerald Schaefer gerald.schaefer@linux.ibm.com Acked-by: David Hildenbrand david@redhat.com Cc: Alexander Gordeev agordeev@linux.ibm.com Cc: Aneesh Kumar K.V aneesh.kumar@linux.ibm.com Cc: Anshuman Khandual anshuman.khandual@arm.com Cc: Heiko Carstens hca@linux.ibm.com Cc: kernel test robot lkp@intel.com Cc: Michal Hocko mhocko@suse.com Cc: Oscar Salvador osalvador@suse.de Cc: Vasily Gorbik gor@linux.ibm.com Cc: stable@vger.kernel.org [5.15+] Signed-off-by: Andrew Morton akpm@linux-foundation.org
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index bb908289679e..7a5fc89a8652 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1458,7 +1458,7 @@ int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) /* create memory block devices after memory was added */ ret = create_memory_block_devices(start, size, params.altmap, group); if (ret) { - arch_remove_memory(start, size, NULL); + arch_remove_memory(start, size, params.altmap); goto error_free; }