powerpc/pseries/cmm: Convert loaned_pages to an atomic_long_t
When switching to balloon compaction, we want to drop the cmm_lock and completely rely on the balloon compaction list lock internally. loaned_pages is currently protected under the cmm_lock. Note: Right now cmm_alloc_pages() and cmm_free_pages() can be called at the same time, e.g., via the thread and a concurrent OOM notifier. Signed-off-by:David Hildenbrand <david@redhat.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191031142933.10779-8-david@redhat.com
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