The patch titled
Subject: mm/memory_hotplug: restrict CONFIG_MEMORY_HOTPLUG to 64 bit
has been added to the -mm tree. Its filename is
mm-memory_hotplug-restrict-config_memory_hotplug-to-64-bit.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-restrict-config_memory_hotplug-to-64-bit.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-restrict-config_memory_hotplug-to-64-bit.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/memory_hotplug: restrict CONFIG_MEMORY_HOTPLUG to 64 bit
32 bit support is broken in various ways: for example, we can online
memory that should actually go to ZONE_HIGHMEM to ZONE_MOVABLE or in some
cases even to one of the other kernel zones.
We marked it BROKEN in commit b59d02ed0869 ("mm/memory_hotplug: disable
the functionality for 32b") almost one year ago. According to that commit
it might be broken at least since 2017. Further, there is hardly a sane
use case nowadays.
Let's just depend completely on 64bit, dropping the "BROKEN" dependency to
make clear that we are not going to support it again. Next, we'll remove
some HIGHMEM leftovers from memory hotplug code to clean up.
Link: https://lkml.kernel.org/r/20210929143600.49379-4-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Alex Shi <alexs@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/Kconfig~mm-memory_hotplug-restrict-config_memory_hotplug-to-64-bit
+++ a/mm/Kconfig
@@ -125,7 +125,7 @@ config MEMORY_HOTPLUG
select MEMORY_ISOLATION
depends on SPARSEMEM
depends on ARCH_ENABLE_MEMORY_HOTPLUG
- depends on 64BIT || BROKEN
+ depends on 64BIT
select NUMA_KEEP_MEMINFO if NUMA
config MEMORY_HOTPLUG_DEFAULT_ONLINE
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
memory-hotplugrst-fix-two-instances-of-movablecore-that-should-be-movable_node.patch
memory-hotplugrst-fix-wrong-sys-module-memory_hotplug-parameters-path.patch
memory-hotplugrst-document-the-auto-movable-online-policy.patch
mm-memory_hotplug-remove-config_x86_64_acpi_numa-dependency-from-config_memory_hotplug.patch
mm-memory_hotplug-remove-config_memory_hotplug_sparse.patch
mm-memory_hotplug-restrict-config_memory_hotplug-to-64-bit.patch
mm-memory_hotplug-remove-highmem-leftovers.patch
mm-memory_hotplug-remove-stale-function-declarations.patch
x86-remove-memory-hotplug-support-on-x86_32.patch
kernel-resource-clean-up-and-optimize-iomem_is_exclusive.patch
kernel-resource-disallow-access-to-exclusive-system-ram-regions.patch
virtio-mem-disallow-mapping-virtio-mem-memory-via-dev-mem.patch
