ubuntu下编译android4.0.3内核时报错怎么解决

drivers/misc/pmem.c: In function ‘flush_pmem_file’:
drivers/misc/pmem.c:806: error: implicit declaration of function ‘dmac_flush_range’
drivers/misc/pmem.c: In function ‘debug_read’:
drivers/misc/pmem.c:1183: warning: cast from pointer to integer of different size
drivers/misc/pmem.c: At top level:
drivers/misc/pmem.c:1218: warning: initialization from incompatible pointer type
drivers/misc/pmem.c: In function ‘pmem_setup’:
drivers/misc/pmem.c:1276: error: implicit declaration of function ‘ioremap_cached’
drivers/misc/pmem.c:1277: warning: assignment makes pointer from integer without a cast
drivers/misc/pmem.c:1294: warning: cast to pointer from integer of different size
make[2]: *** [drivers/misc/pmem.o] 错误 1
make[1]: *** [drivers/misc] 错误 2
make: *** [drivers] 错误 2