#ifndef __ASM_GENERIC_PGALLOC_H#define __ASM_GENERIC_PGALLOC_H/* * an empty file is enough for a nommu architecture */#ifdef CONFIG_MMU#error need to implement an architecture specific asm/pgalloc.h#endif #define check_pgt_cache()          do { } while (0) #endif /* __ASM_GENERIC_PGALLOC_H */