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ACPI: NUMA: Process hotpluggable memblocks when !CONFIG_MEMORY_HOTPLUG

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Some systems (e.g. Hyper-V guests) have all their memory marked as
hotpluggable in SRAT. acpi_numa_memory_affinity_init(), however,
ignores all such regions when !CONFIG_MEMORY_HOTPLUG and this is
unfortunate as memory affinity (NUMA) information gets lost.

'Hot Pluggable' flag in SRAT only means that "system hardware supports
hot-add and hot-remove of this memory region", it doesn't prevent
memory from being cold-plugged there.

Ignore 'Hot Pluggable' bit instead of skipping the whole memory
affinity information when !CONFIG_MEMORY_HOTPLUG.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Vitaly Kuznetsov 2021-12-16 10:58:26 +01:00 committed by Rafael J. Wysocki
parent 2585cf9dfa
commit bcf6f1759a
1 changed files with 2 additions and 3 deletions
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5
drivers/acpi/numa/srat.c
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@ -254,9 +254,8 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
}
if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
goto out_err;
hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
if (hotpluggable && !IS_ENABLED(CONFIG_MEMORY_HOTPLUG))
goto out_err;
hotpluggable = IS_ENABLED(CONFIG_MEMORY_HOTPLUG) &&
(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE);
start = ma->base_address;
end = start + ma->length;