[linux.git] / lib / Kconfig

#
# Library configuration
#

config BINARY_PRINTF
	def_bool n

menu "Library routines"

config RAID6_PQ
	tristate

config BITREVERSE
	tristate

config RATIONAL
	boolean

config GENERIC_STRNCPY_FROM_USER
	bool

config GENERIC_STRNLEN_USER
	bool

config GENERIC_FIND_FIRST_BIT
	bool

config NO_GENERIC_PCI_IOPORT_MAP
	bool

config GENERIC_PCI_IOMAP
	bool

config GENERIC_IOMAP
	bool
	select GENERIC_PCI_IOMAP

config GENERIC_IO
	boolean
	default n

config STMP_DEVICE
	bool

config CRC_CCITT
	tristate "CRC-CCITT functions"
	help
	  This option is provided for the case where no in-kernel-tree
	  modules require CRC-CCITT functions, but a module built outside
	  the kernel tree does. Such modules that use library CRC-CCITT
	  functions require M here.

config CRC16
	tristate "CRC16 functions"
	help
	  This option is provided for the case where no in-kernel-tree
	  modules require CRC16 functions, but a module built outside
	  the kernel tree does. Such modules that use library CRC16
	  functions require M here.

config CRC_T10DIF
	tristate "CRC calculation for the T10 Data Integrity Field"
	help
	  This option is only needed if a module that's not in the
	  kernel tree needs to calculate CRC checks for use with the
	  SCSI data integrity subsystem.

config CRC_ITU_T
	tristate "CRC ITU-T V.41 functions"
	help
	  This option is provided for the case where no in-kernel-tree
	  modules require CRC ITU-T V.41 functions, but a module built outside
	  the kernel tree does. Such modules that use library CRC ITU-T V.41
	  functions require M here.

config CRC32
	tristate "CRC32/CRC32c functions"
	default y
	select BITREVERSE
	help
	  This option is provided for the case where no in-kernel-tree
	  modules require CRC32/CRC32c functions, but a module built outside
	  the kernel tree does. Such modules that use library CRC32/CRC32c
	  functions require M here.

config CRC32_SELFTEST
	bool "CRC32 perform self test on init"
	default n
	depends on CRC32
	help
	  This option enables the CRC32 library functions to perform a
	  self test on initialization. The self test computes crc32_le
	  and crc32_be over byte strings with random alignment and length
	  and computes the total elapsed time and number of bytes processed.

choice
	prompt "CRC32 implementation"
	depends on CRC32
	default CRC32_SLICEBY8
	help
	  This option allows a kernel builder to override the default choice
	  of CRC32 algorithm.  Choose the default ("slice by 8") unless you
	  know that you need one of the others.

config CRC32_SLICEBY8
	bool "Slice by 8 bytes"
	help
	  Calculate checksum 8 bytes at a time with a clever slicing algorithm.
	  This is the fastest algorithm, but comes with a 8KiB lookup table.
	  Most modern processors have enough cache to hold this table without
	  thrashing the cache.

	  This is the default implementation choice.  Choose this one unless
	  you have a good reason not to.

config CRC32_SLICEBY4
	bool "Slice by 4 bytes"
	help
	  Calculate checksum 4 bytes at a time with a clever slicing algorithm.
	  This is a bit slower than slice by 8, but has a smaller 4KiB lookup
	  table.

	  Only choose this option if you know what you are doing.

config CRC32_SARWATE
	bool "Sarwate's Algorithm (one byte at a time)"
	help
	  Calculate checksum a byte at a time using Sarwate's algorithm.  This
	  is not particularly fast, but has a small 256 byte lookup table.

	  Only choose this option if you know what you are doing.

config CRC32_BIT
	bool "Classic Algorithm (one bit at a time)"
	help
	  Calculate checksum one bit at a time.  This is VERY slow, but has
	  no lookup table.  This is provided as a debugging option.

	  Only choose this option if you are debugging crc32.

endchoice

config CRC7
	tristate "CRC7 functions"
	help
	  This option is provided for the case where no in-kernel-tree
	  modules require CRC7 functions, but a module built outside
	  the kernel tree does. Such modules that use library CRC7
	  functions require M here.

config LIBCRC32C
	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
	select CRYPTO
	select CRYPTO_CRC32C
	help
	  This option is provided for the case where no in-kernel-tree
	  modules require CRC32c functions, but a module built outside the
	  kernel tree does. Such modules that use library CRC32c functions
	  require M here.  See Castagnoli93.
	  Module will be libcrc32c.

config CRC8
	tristate "CRC8 function"
	help
	  This option provides CRC8 function. Drivers may select this
	  when they need to do cyclic redundancy check according CRC8
	  algorithm. Module will be called crc8.

config AUDIT_GENERIC
	bool
	depends on AUDIT && !AUDIT_ARCH
	default y

#
# compression support is select'ed if needed
#
config ZLIB_INFLATE
	tristate

config ZLIB_DEFLATE
	tristate

config LZO_COMPRESS
	tristate

config LZO_DECOMPRESS
	tristate

source "lib/xz/Kconfig"

#
# These all provide a common interface (hence the apparent duplication with
# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
#
config DECOMPRESS_GZIP
	select ZLIB_INFLATE
	tristate

config DECOMPRESS_BZIP2
	tristate

config DECOMPRESS_LZMA
	tristate

config DECOMPRESS_XZ
	select XZ_DEC
	tristate

config DECOMPRESS_LZO
	select LZO_DECOMPRESS
	tristate

#
# Generic allocator support is selected if needed
#
config GENERIC_ALLOCATOR
	boolean

#
# reed solomon support is select'ed if needed
#
config REED_SOLOMON
	tristate
	
config REED_SOLOMON_ENC8
	boolean

config REED_SOLOMON_DEC8
	boolean

config REED_SOLOMON_ENC16
	boolean

config REED_SOLOMON_DEC16
	boolean

#
# BCH support is selected if needed
#
config BCH
	tristate

config BCH_CONST_PARAMS
	boolean
	help
	  Drivers may select this option to force specific constant
	  values for parameters 'm' (Galois field order) and 't'
	  (error correction capability). Those specific values must
	  be set by declaring default values for symbols BCH_CONST_M
	  and BCH_CONST_T.
	  Doing so will enable extra compiler optimizations,
	  improving encoding and decoding performance up to 2x for
	  usual (m,t) values (typically such that m*t < 200).
	  When this option is selected, the BCH library supports
	  only a single (m,t) configuration. This is mainly useful
	  for NAND flash board drivers requiring known, fixed BCH
	  parameters.

config BCH_CONST_M
	int
	range 5 15
	help
	  Constant value for Galois field order 'm'. If 'k' is the
	  number of data bits to protect, 'm' should be chosen such
	  that (k + m*t) <= 2**m - 1.
	  Drivers should declare a default value for this symbol if
	  they select option BCH_CONST_PARAMS.

config BCH_CONST_T
	int
	help
	  Constant value for error correction capability in bits 't'.
	  Drivers should declare a default value for this symbol if
	  they select option BCH_CONST_PARAMS.

#
# Textsearch support is select'ed if needed
#
config TEXTSEARCH
	boolean

config TEXTSEARCH_KMP
	tristate

config TEXTSEARCH_BM
	tristate

config TEXTSEARCH_FSM
	tristate

config BTREE
	boolean

config HAS_IOMEM
	boolean
	depends on !NO_IOMEM
	select GENERIC_IO
	default y

config HAS_IOPORT
	boolean
	depends on HAS_IOMEM && !NO_IOPORT
	default y

config HAS_DMA
	boolean
	depends on !NO_DMA
	default y

config CHECK_SIGNATURE
	bool

config CPUMASK_OFFSTACK
	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
	help
	  Use dynamic allocation for cpumask_var_t, instead of putting
	  them on the stack.  This is a bit more expensive, but avoids
	  stack overflow.

config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
       bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
       depends on EXPERIMENTAL && BROKEN

config CPU_RMAP
	bool
	depends on SMP

config DQL
	bool

#
# Netlink attribute parsing support is select'ed if needed
#
config NLATTR
	bool

#
# Generic 64-bit atomic support is selected if needed
#
config GENERIC_ATOMIC64
       bool

config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	def_bool y if GENERIC_ATOMIC64

config LRU_CACHE
	tristate

config AVERAGE
	bool "Averaging functions"
	help
	  This option is provided for the case where no in-kernel-tree
	  modules require averaging functions, but a module built outside
	  the kernel tree does. Such modules that use library averaging
	  functions require Y here.

	  If unsure, say N.

config CLZ_TAB
	bool

config CORDIC
	tristate "CORDIC algorithm"
	help
	  This option provides an implementation of the CORDIC algorithm;
	  calculations are in fixed point. Module will be called cordic.

config DDR
	bool "JEDEC DDR data"
	help
	  Data from JEDEC specs for DDR SDRAM memories,
	  particularly the AC timing parameters and addressing
	  information. This data is useful for drivers handling
	  DDR SDRAM controllers.

config MPILIB
	tristate
	select CLZ_TAB
	help
	  Multiprecision maths library from GnuPG.
	  It is used to implement RSA digital signature verification,
	  which is used by IMA/EVM digital signature extension.

config SIGNATURE
	tristate
	depends on KEYS && CRYPTO
	select CRYPTO_SHA1
	select MPILIB
	help
	  Digital signature verification. Currently only RSA is supported.
	  Implementation is done using GnuPG MPI library

#
# libfdt files, only selected if needed.
#
config LIBFDT
	bool

config OID_REGISTRY
	tristate
	help
	  Enable fast lookup object identifier registry.

endmenu
Commit	Line	Data
1da177e4 LT	1	#
	2	# Library configuration
	3	#
	4
4370aa4a LJ	5	config BINARY_PRINTF
	6	def_bool n
	7
1da177e4 LT	8	menu "Library routines"
1da177e4 LT	9
f5e70d0f DW	10	config RAID6_PQ
	11	tristate
	12
a5cfc1ec AM	13	config BITREVERSE
	14	tristate
	15
8759ef32 OS	16	config RATIONAL
	17	boolean
	18
2922585b DM	19	config GENERIC_STRNCPY_FROM_USER
	20	bool
	21
a08c5356 LT	22	config GENERIC_STRNLEN_USER
	23	bool
	24
19870def	25	config GENERIC_FIND_FIRST_BIT
9ba16087	26	bool
19870def	27
b923650b MT	28	config NO_GENERIC_PCI_IOPORT_MAP
	29	bool
	30
66eab4df MT	31	config GENERIC_PCI_IOMAP
	32	bool
	33
4673ca8e MT	34	config GENERIC_IOMAP
4673ca8e MT	35	bool
66eab4df	36	select GENERIC_PCI_IOMAP
4673ca8e	37
087fafd1 RW	38	config GENERIC_IO
	39	boolean
	40	default n
	41
4ccf4bea WS	42	config STMP_DEVICE
	43	bool
	44
1da177e4 LT	45	config CRC_CCITT
	46	tristate "CRC-CCITT functions"
	47	help
	48	This option is provided for the case where no in-kernel-tree
	49	modules require CRC-CCITT functions, but a module built outside
	50	the kernel tree does. Such modules that use library CRC-CCITT
	51	functions require M here.
	52
7657ec1f EP	53	config CRC16
	54	tristate "CRC16 functions"
	55	help
	56	This option is provided for the case where no in-kernel-tree
	57	modules require CRC16 functions, but a module built outside
	58	the kernel tree does. Such modules that use library CRC16
	59	functions require M here.
	60
f11f594e MP	61	config CRC_T10DIF
	62	tristate "CRC calculation for the T10 Data Integrity Field"
	63	help
	64	This option is only needed if a module that's not in the
	65	kernel tree needs to calculate CRC checks for use with the
	66	SCSI data integrity subsystem.
	67
3e7cbae7 ID	68	config CRC_ITU_T
	69	tristate "CRC ITU-T V.41 functions"
	70	help
	71	This option is provided for the case where no in-kernel-tree
	72	modules require CRC ITU-T V.41 functions, but a module built outside
	73	the kernel tree does. Such modules that use library CRC ITU-T V.41
	74	functions require M here.
	75
1da177e4	76	config CRC32
46c5801e	77	tristate "CRC32/CRC32c functions"
1da177e4	78	default y
906d66df	79	select BITREVERSE
1da177e4 LT	80	help
1da177e4 LT	81	This option is provided for the case where no in-kernel-tree
46c5801e DW	82	modules require CRC32/CRC32c functions, but a module built outside
	83	the kernel tree does. Such modules that use library CRC32/CRC32c
	84	functions require M here.
1da177e4	85
3863ef31 BP	86	config CRC32_SELFTEST
	87	bool "CRC32 perform self test on init"
	88	default n
	89	depends on CRC32
	90	help
	91	This option enables the CRC32 library functions to perform a
	92	self test on initialization. The self test computes crc32_le
	93	and crc32_be over byte strings with random alignment and length
	94	and computes the total elapsed time and number of bytes processed.
	95
5cde7656 DW	96	choice
	97	prompt "CRC32 implementation"
	98	depends on CRC32
	99	default CRC32_SLICEBY8
82edb4ba DW	100	help
	101	This option allows a kernel builder to override the default choice
	102	of CRC32 algorithm. Choose the default ("slice by 8") unless you
	103	know that you need one of the others.
5cde7656 DW	104
	105	config CRC32_SLICEBY8
	106	bool "Slice by 8 bytes"
	107	help
	108	Calculate checksum 8 bytes at a time with a clever slicing algorithm.
	109	This is the fastest algorithm, but comes with a 8KiB lookup table.
	110	Most modern processors have enough cache to hold this table without
	111	thrashing the cache.
	112
	113	This is the default implementation choice. Choose this one unless
	114	you have a good reason not to.
	115
	116	config CRC32_SLICEBY4
	117	bool "Slice by 4 bytes"
	118	help
	119	Calculate checksum 4 bytes at a time with a clever slicing algorithm.
	120	This is a bit slower than slice by 8, but has a smaller 4KiB lookup
	121	table.
	122
	123	Only choose this option if you know what you are doing.
	124
	125	config CRC32_SARWATE
	126	bool "Sarwate's Algorithm (one byte at a time)"
	127	help
	128	Calculate checksum a byte at a time using Sarwate's algorithm. This
	129	is not particularly fast, but has a small 256 byte lookup table.
	130
	131	Only choose this option if you know what you are doing.
	132
	133	config CRC32_BIT
	134	bool "Classic Algorithm (one bit at a time)"
	135	help
	136	Calculate checksum one bit at a time. This is VERY slow, but has
	137	no lookup table. This is provided as a debugging option.
	138
	139	Only choose this option if you are debugging crc32.
	140
	141	endchoice
	142
ad241528 JN	143	config CRC7
	144	tristate "CRC7 functions"
	145	help
	146	This option is provided for the case where no in-kernel-tree
	147	modules require CRC7 functions, but a module built outside
	148	the kernel tree does. Such modules that use library CRC7
	149	functions require M here.
	150
1da177e4 LT	151	config LIBCRC32C
1da177e4 LT	152	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
93027354	153	select CRYPTO
69c35efc	154	select CRYPTO_CRC32C
1da177e4 LT	155	help
	156	This option is provided for the case where no in-kernel-tree
	157	modules require CRC32c functions, but a module built outside the
	158	kernel tree does. Such modules that use library CRC32c functions
	159	require M here. See Castagnoli93.
	160	Module will be libcrc32c.
	161
7150962d AS	162	config CRC8
	163	tristate "CRC8 function"
	164	help
	165	This option provides CRC8 function. Drivers may select this
	166	when they need to do cyclic redundancy check according CRC8
	167	algorithm. Module will be called crc8.
	168
e65e1fc2 AV	169	config AUDIT_GENERIC
	170	bool
	171	depends on AUDIT && !AUDIT_ARCH
	172	default y
	173
1da177e4 LT	174	#
	175	# compression support is select'ed if needed
	176	#
	177	config ZLIB_INFLATE
	178	tristate
	179
	180	config ZLIB_DEFLATE
	181	tristate
	182
64c70b1c RP	183	config LZO_COMPRESS
	184	tristate
	185
	186	config LZO_DECOMPRESS
	187	tristate
	188
24fa0402 LC	189	source "lib/xz/Kconfig"
24fa0402 LC	190
c8531ab3 PA	191	#
	192	# These all provide a common interface (hence the apparent duplication with
	193	# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
	194	#
	195	config DECOMPRESS_GZIP
7856a16e	196	select ZLIB_INFLATE
c8531ab3 PA	197	tristate
	198
	199	config DECOMPRESS_BZIP2
	200	tristate
	201
	202	config DECOMPRESS_LZMA
	203	tristate
	204
3ebe1243 LC	205	config DECOMPRESS_XZ
	206	select XZ_DEC
	207	tristate
	208
cacb246f AT	209	config DECOMPRESS_LZO
	210	select LZO_DECOMPRESS
	211	tristate
	212
f14f75b8 JS	213	#
	214	# Generic allocator support is selected if needed
	215	#
	216	config GENERIC_ALLOCATOR
	217	boolean
	218
1da177e4 LT	219	#
	220	# reed solomon support is select'ed if needed
	221	#
	222	config REED_SOLOMON
	223	tristate
	224
	225	config REED_SOLOMON_ENC8
	226	boolean
	227
	228	config REED_SOLOMON_DEC8
	229	boolean
	230
	231	config REED_SOLOMON_ENC16
	232	boolean
	233
	234	config REED_SOLOMON_DEC16
	235	boolean
	236
437aa565 ID	237	#
	238	# BCH support is selected if needed
	239	#
	240	config BCH
	241	tristate
	242
	243	config BCH_CONST_PARAMS
	244	boolean
	245	help
	246	Drivers may select this option to force specific constant
	247	values for parameters 'm' (Galois field order) and 't'
	248	(error correction capability). Those specific values must
	249	be set by declaring default values for symbols BCH_CONST_M
	250	and BCH_CONST_T.
	251	Doing so will enable extra compiler optimizations,
	252	improving encoding and decoding performance up to 2x for
	253	usual (m,t) values (typically such that m*t < 200).
	254	When this option is selected, the BCH library supports
	255	only a single (m,t) configuration. This is mainly useful
	256	for NAND flash board drivers requiring known, fixed BCH
	257	parameters.
	258
	259	config BCH_CONST_M
	260	int
	261	range 5 15
	262	help
	263	Constant value for Galois field order 'm'. If 'k' is the
	264	number of data bits to protect, 'm' should be chosen such
	265	that (k + mt) <= 2*m - 1.
	266	Drivers should declare a default value for this symbol if
	267	they select option BCH_CONST_PARAMS.
	268
	269	config BCH_CONST_T
	270	int
	271	help
	272	Constant value for error correction capability in bits 't'.
	273	Drivers should declare a default value for this symbol if
	274	they select option BCH_CONST_PARAMS.
	275
f7704347 DM	276	#
	277	# Textsearch support is select'ed if needed
	278	#
2de4ff7b	279	config TEXTSEARCH
f7704347	280	boolean
1da177e4	281
df3fb93a	282	config TEXTSEARCH_KMP
f7704347	283	tristate
df3fb93a	284
8082e4ed	285	config TEXTSEARCH_BM
29cb9f9c	286	tristate
8082e4ed	287
6408f79c	288	config TEXTSEARCH_FSM
f7704347	289	tristate
6408f79c	290
5db53f3e JE	291	config BTREE
	292	boolean
	293
5ea81769	294	config HAS_IOMEM
ee36c2bf	295	boolean
5ea81769	296	depends on !NO_IOMEM
087fafd1	297	select GENERIC_IO
5ea81769 AV	298	default y
	299
	300	config HAS_IOPORT
	301	boolean
	302	depends on HAS_IOMEM && !NO_IOPORT
ee36c2bf AV	303	default y
ee36c2bf AV	304
411f0f3e HC	305	config HAS_DMA
	306	boolean
	307	depends on !NO_DMA
	308	default y
	309
928923c7 GU	310	config CHECK_SIGNATURE
	311	bool
	312
aab46da0 RR	313	config CPUMASK_OFFSTACK
	314	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
	315	help
	316	Use dynamic allocation for cpumask_var_t, instead of putting
	317	them on the stack. This is a bit more expensive, but avoids
	318	stack overflow.
	319
8c384cde RR	320	config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
	321	bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
	322	depends on EXPERIMENTAL && BROKEN
	323
c39649c3 BH	324	config CPU_RMAP
	325	bool
	326	depends on SMP
	327
75957ba3 TH	328	config DQL
	329	bool
	330
e9cc8bdd GU	331	#
	332	# Netlink attribute parsing support is select'ed if needed
	333	#
	334	config NLATTR
	335	bool
	336
09d4e0ed PM	337	#
	338	# Generic 64-bit atomic support is selected if needed
	339	#
	340	config GENERIC_ATOMIC64
	341	bool
	342
7463449b CM	343	config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	344	def_bool y if GENERIC_ATOMIC64
	345
b411b363 PR	346	config LRU_CACHE
	347	tristate
	348
c5485a7e	349	config AVERAGE
a7a9a24d MB	350	bool "Averaging functions"
	351	help
	352	This option is provided for the case where no in-kernel-tree
	353	modules require averaging functions, but a module built outside
	354	the kernel tree does. Such modules that use library averaging
	355	functions require Y here.
	356
	357	If unsure, say N.
c5485a7e	358
c6df4b17 DM	359	config CLZ_TAB
	360	bool
	361
10f8113e	362	config CORDIC
d89ce936	363	tristate "CORDIC algorithm"
10f8113e	364	help
435a95c5 MW	365	This option provides an implementation of the CORDIC algorithm;
435a95c5 MW	366	calculations are in fixed point. Module will be called cordic.
10f8113e	367
9c1c21a0 A	368	config DDR
	369	bool "JEDEC DDR data"
	370	help
	371	Data from JEDEC specs for DDR SDRAM memories,
	372	particularly the AC timing parameters and addressing
	373	information. This data is useful for drivers handling
	374	DDR SDRAM controllers.
	375
d9c46b18	376	config MPILIB
2e5f094b	377	tristate
c6df4b17	378	select CLZ_TAB
d9c46b18 DK	379	help
	380	Multiprecision maths library from GnuPG.
	381	It is used to implement RSA digital signature verification,
	382	which is used by IMA/EVM digital signature extension.
	383
5e8898e9	384	config SIGNATURE
2e5f094b	385	tristate
be440ec7 DK	386	depends on KEYS && CRYPTO
be440ec7 DK	387	select CRYPTO_SHA1
051dbb91 DK	388	select MPILIB
	389	help
	390	Digital signature verification. Currently only RSA is supported.
	391	Implementation is done using GnuPG MPI library
	392
ab253839 DD	393	#
	394	# libfdt files, only selected if needed.
	395	#
	396	config LIBFDT
	397	bool
	398
a77ad6ea DH	399	config OID_REGISTRY
	400	tristate
	401	help
	402	Enable fast lookup object identifier registry.
	403
2de4ff7b	404	endmenu