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Stub out vm_get_page_prot() if there's no MMU. This was added by commit804af2cf6e("[AGPGART] remove private page protection map") and is used in commitc07fbfd17e("fbmem: VM_IO set, but not propagated") in the fbmem video driver, but the function doesn't exist on NOMMU, resulting in an undefined symbol at link time. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>