2.5.21 make allnoconfig errors

[Keith Owens <kaos@ocs.com.au>]

namespace.h, dcache.h do not cope with make allnoconfig.

In file included from kernel/fork.c:22:
include/linux/namespace.h:9: field `sem' has incomplete type
include/linux/namespace.h: In function `put_namespace':
include/linux/namespace.h:18: `dcache_lock' undeclared (first use in this function)
include/linux/namespace.h:18: (Each undeclared identifier is reported only once
include/linux/namespace.h:18: for each function it appears in.)
include/linux/namespace.h: In function `exit_namespace':
include/linux/namespace.h:28: dereferencing pointer to incomplete type
include/linux/namespace.h:31: dereferencing pointer to incomplete type
In file included from include/linux/fs.h:19,
                 from kernel/fork.c:26:
include/linux/dcache.h: At top level:
include/linux/dcache.h:136: `dcache_lock' used prior to declaration

In file included from include/linux/highmem.h:5,
                 from mm/vmalloc.c:13:
include/linux/bio.h:90: parse error before `atomic_t'
include/linux/bio.h:95: parse error before `}'

CONFIG_X86=y
CONFIG_ISA=y
CONFIG_UID16=y
CONFIG_M686=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_X86_L1_CACHE_SHIFT=5
CONFIG_X86_TSC=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_PPRO_FENCE=y
CONFIG_NOHIGHMEM=y
CONFIG_SOUND_GAMEPORT=y
CONFIG_RAMFS=y
CONFIG_MSDOS_PARTITION=y