From patchwork series 420255

https://patchwork.ozlabs.org//project/linuxppc-dev/list/?series=420255

Author: Fox Snowpatch

arch/powerpc/mm/book3s64/hash_utils.c

@@ -125,7 +125,7 @@ int mmu_ci_restrictions;
 #endif
 static u8 *linear_map_hash_slots;
 static unsigned long linear_map_hash_count;
-struct mmu_hash_ops mmu_hash_ops;
+struct mmu_hash_ops mmu_hash_ops __ro_after_init;
 EXPORT_SYMBOL(mmu_hash_ops);
 
 /*