powerpc/mm: protect linear mapping modifications by a mutex

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This code currently relies on mem_hotplug_begin()/mem_hotplug_done() -
create_section_mapping()/remove_section_mapping() implementations
cannot tollerate getting called concurrently.

Let's prepare for callers (memtrace) not holding any such locks (and
don't force them to mess with memory hotplug locks).

Other parts in these functions don't seem to rely on external locking.

Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201111145322.15793-5-david@redhat.com

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David Hildenbrand 2020-11-11 15:53:18 +01:00 • committed by Michael Ellerman

parent 4abb1e5b63

commit e5b2af044f

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arch/powerpc/mm/mem.c

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