[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_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 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 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 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 MPILIB_EXTRA
	bool
	depends on MPILIB
	help
	  Additional sources of multiprecision maths library from GnuPG.
	  This code is unnecessary for RSA digital signature verification,
	  but can be compiled if needed.

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

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
19870def	19	config GENERIC_FIND_FIRST_BIT
9ba16087	20	bool
19870def	21
b923650b MT	22	config NO_GENERIC_PCI_IOPORT_MAP
	23	bool
	24
66eab4df MT	25	config GENERIC_PCI_IOMAP
	26	bool
	27
4673ca8e MT	28	config GENERIC_IOMAP
4673ca8e MT	29	bool
66eab4df	30	select GENERIC_PCI_IOMAP
4673ca8e	31
087fafd1 RW	32	config GENERIC_IO
	33	boolean
	34	default n
	35
1da177e4 LT	36	config CRC_CCITT
	37	tristate "CRC-CCITT functions"
	38	help
	39	This option is provided for the case where no in-kernel-tree
	40	modules require CRC-CCITT functions, but a module built outside
	41	the kernel tree does. Such modules that use library CRC-CCITT
	42	functions require M here.
	43
7657ec1f EP	44	config CRC16
	45	tristate "CRC16 functions"
	46	help
	47	This option is provided for the case where no in-kernel-tree
	48	modules require CRC16 functions, but a module built outside
	49	the kernel tree does. Such modules that use library CRC16
	50	functions require M here.
	51
f11f594e MP	52	config CRC_T10DIF
	53	tristate "CRC calculation for the T10 Data Integrity Field"
	54	help
	55	This option is only needed if a module that's not in the
	56	kernel tree needs to calculate CRC checks for use with the
	57	SCSI data integrity subsystem.
	58
3e7cbae7 ID	59	config CRC_ITU_T
	60	tristate "CRC ITU-T V.41 functions"
	61	help
	62	This option is provided for the case where no in-kernel-tree
	63	modules require CRC ITU-T V.41 functions, but a module built outside
	64	the kernel tree does. Such modules that use library CRC ITU-T V.41
	65	functions require M here.
	66
1da177e4	67	config CRC32
46c5801e	68	tristate "CRC32/CRC32c functions"
1da177e4	69	default y
906d66df	70	select BITREVERSE
1da177e4 LT	71	help
1da177e4 LT	72	This option is provided for the case where no in-kernel-tree
46c5801e DW	73	modules require CRC32/CRC32c functions, but a module built outside
	74	the kernel tree does. Such modules that use library CRC32/CRC32c
	75	functions require M here.
1da177e4	76
3863ef31 BP	77	config CRC32_SELFTEST
	78	bool "CRC32 perform self test on init"
	79	default n
	80	depends on CRC32
	81	help
	82	This option enables the CRC32 library functions to perform a
	83	self test on initialization. The self test computes crc32_le
	84	and crc32_be over byte strings with random alignment and length
	85	and computes the total elapsed time and number of bytes processed.
	86
5cde7656 DW	87	choice
	88	prompt "CRC32 implementation"
	89	depends on CRC32
	90	default CRC32_SLICEBY8
82edb4ba DW	91	help
	92	This option allows a kernel builder to override the default choice
	93	of CRC32 algorithm. Choose the default ("slice by 8") unless you
	94	know that you need one of the others.
5cde7656 DW	95
	96	config CRC32_SLICEBY8
	97	bool "Slice by 8 bytes"
	98	help
	99	Calculate checksum 8 bytes at a time with a clever slicing algorithm.
	100	This is the fastest algorithm, but comes with a 8KiB lookup table.
	101	Most modern processors have enough cache to hold this table without
	102	thrashing the cache.
	103
	104	This is the default implementation choice. Choose this one unless
	105	you have a good reason not to.
	106
	107	config CRC32_SLICEBY4
	108	bool "Slice by 4 bytes"
	109	help
	110	Calculate checksum 4 bytes at a time with a clever slicing algorithm.
	111	This is a bit slower than slice by 8, but has a smaller 4KiB lookup
	112	table.
	113
	114	Only choose this option if you know what you are doing.
	115
	116	config CRC32_SARWATE
	117	bool "Sarwate's Algorithm (one byte at a time)"
	118	help
	119	Calculate checksum a byte at a time using Sarwate's algorithm. This
	120	is not particularly fast, but has a small 256 byte lookup table.
	121
	122	Only choose this option if you know what you are doing.
	123
	124	config CRC32_BIT
	125	bool "Classic Algorithm (one bit at a time)"
	126	help
	127	Calculate checksum one bit at a time. This is VERY slow, but has
	128	no lookup table. This is provided as a debugging option.
	129
	130	Only choose this option if you are debugging crc32.
	131
	132	endchoice
	133
ad241528 JN	134	config CRC7
	135	tristate "CRC7 functions"
	136	help
	137	This option is provided for the case where no in-kernel-tree
	138	modules require CRC7 functions, but a module built outside
	139	the kernel tree does. Such modules that use library CRC7
	140	functions require M here.
	141
1da177e4 LT	142	config LIBCRC32C
1da177e4 LT	143	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
93027354	144	select CRYPTO
69c35efc	145	select CRYPTO_CRC32C
1da177e4 LT	146	help
	147	This option is provided for the case where no in-kernel-tree
	148	modules require CRC32c functions, but a module built outside the
	149	kernel tree does. Such modules that use library CRC32c functions
	150	require M here. See Castagnoli93.
	151	Module will be libcrc32c.
	152
7150962d AS	153	config CRC8
	154	tristate "CRC8 function"
	155	help
	156	This option provides CRC8 function. Drivers may select this
	157	when they need to do cyclic redundancy check according CRC8
	158	algorithm. Module will be called crc8.
	159
e65e1fc2 AV	160	config AUDIT_GENERIC
	161	bool
	162	depends on AUDIT && !AUDIT_ARCH
	163	default y
	164
1da177e4 LT	165	#
	166	# compression support is select'ed if needed
	167	#
	168	config ZLIB_INFLATE
	169	tristate
	170
	171	config ZLIB_DEFLATE
	172	tristate
	173
64c70b1c RP	174	config LZO_COMPRESS
	175	tristate
	176
	177	config LZO_DECOMPRESS
	178	tristate
	179
24fa0402 LC	180	source "lib/xz/Kconfig"
24fa0402 LC	181
c8531ab3 PA	182	#
	183	# These all provide a common interface (hence the apparent duplication with
	184	# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
	185	#
	186	config DECOMPRESS_GZIP
7856a16e	187	select ZLIB_INFLATE
c8531ab3 PA	188	tristate
	189
	190	config DECOMPRESS_BZIP2
	191	tristate
	192
	193	config DECOMPRESS_LZMA
	194	tristate
	195
3ebe1243 LC	196	config DECOMPRESS_XZ
	197	select XZ_DEC
	198	tristate
	199
cacb246f AT	200	config DECOMPRESS_LZO
	201	select LZO_DECOMPRESS
	202	tristate
	203
f14f75b8 JS	204	#
	205	# Generic allocator support is selected if needed
	206	#
	207	config GENERIC_ALLOCATOR
	208	boolean
	209
1da177e4 LT	210	#
	211	# reed solomon support is select'ed if needed
	212	#
	213	config REED_SOLOMON
	214	tristate
	215
	216	config REED_SOLOMON_ENC8
	217	boolean
	218
	219	config REED_SOLOMON_DEC8
	220	boolean
	221
	222	config REED_SOLOMON_ENC16
	223	boolean
	224
	225	config REED_SOLOMON_DEC16
	226	boolean
	227
437aa565 ID	228	#
	229	# BCH support is selected if needed
	230	#
	231	config BCH
	232	tristate
	233
	234	config BCH_CONST_PARAMS
	235	boolean
	236	help
	237	Drivers may select this option to force specific constant
	238	values for parameters 'm' (Galois field order) and 't'
	239	(error correction capability). Those specific values must
	240	be set by declaring default values for symbols BCH_CONST_M
	241	and BCH_CONST_T.
	242	Doing so will enable extra compiler optimizations,
	243	improving encoding and decoding performance up to 2x for
	244	usual (m,t) values (typically such that m*t < 200).
	245	When this option is selected, the BCH library supports
	246	only a single (m,t) configuration. This is mainly useful
	247	for NAND flash board drivers requiring known, fixed BCH
	248	parameters.
	249
	250	config BCH_CONST_M
	251	int
	252	range 5 15
	253	help
	254	Constant value for Galois field order 'm'. If 'k' is the
	255	number of data bits to protect, 'm' should be chosen such
	256	that (k + mt) <= 2*m - 1.
	257	Drivers should declare a default value for this symbol if
	258	they select option BCH_CONST_PARAMS.
	259
	260	config BCH_CONST_T
	261	int
	262	help
	263	Constant value for error correction capability in bits 't'.
	264	Drivers should declare a default value for this symbol if
	265	they select option BCH_CONST_PARAMS.
	266
f7704347 DM	267	#
	268	# Textsearch support is select'ed if needed
	269	#
2de4ff7b	270	config TEXTSEARCH
f7704347	271	boolean
1da177e4	272
df3fb93a	273	config TEXTSEARCH_KMP
f7704347	274	tristate
df3fb93a	275
8082e4ed	276	config TEXTSEARCH_BM
29cb9f9c	277	tristate
8082e4ed	278
6408f79c	279	config TEXTSEARCH_FSM
f7704347	280	tristate
6408f79c	281
5db53f3e JE	282	config BTREE
	283	boolean
	284
5ea81769	285	config HAS_IOMEM
ee36c2bf	286	boolean
5ea81769	287	depends on !NO_IOMEM
087fafd1	288	select GENERIC_IO
5ea81769 AV	289	default y
	290
	291	config HAS_IOPORT
	292	boolean
	293	depends on HAS_IOMEM && !NO_IOPORT
ee36c2bf AV	294	default y
ee36c2bf AV	295
411f0f3e HC	296	config HAS_DMA
	297	boolean
	298	depends on !NO_DMA
	299	default y
	300
928923c7 GU	301	config CHECK_SIGNATURE
	302	bool
	303
aab46da0 RR	304	config CPUMASK_OFFSTACK
	305	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
	306	help
	307	Use dynamic allocation for cpumask_var_t, instead of putting
	308	them on the stack. This is a bit more expensive, but avoids
	309	stack overflow.
	310
8c384cde RR	311	config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
	312	bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
	313	depends on EXPERIMENTAL && BROKEN
	314
c39649c3 BH	315	config CPU_RMAP
	316	bool
	317	depends on SMP
	318
75957ba3 TH	319	config DQL
	320	bool
	321
e9cc8bdd GU	322	#
	323	# Netlink attribute parsing support is select'ed if needed
	324	#
	325	config NLATTR
	326	bool
	327
09d4e0ed PM	328	#
	329	# Generic 64-bit atomic support is selected if needed
	330	#
	331	config GENERIC_ATOMIC64
	332	bool
	333
b411b363 PR	334	config LRU_CACHE
	335	tristate
	336
c5485a7e	337	config AVERAGE
a7a9a24d MB	338	bool "Averaging functions"
	339	help
	340	This option is provided for the case where no in-kernel-tree
	341	modules require averaging functions, but a module built outside
	342	the kernel tree does. Such modules that use library averaging
	343	functions require Y here.
	344
	345	If unsure, say N.
c5485a7e	346
c6df4b17 DM	347	config CLZ_TAB
	348	bool
	349
10f8113e	350	config CORDIC
d89ce936	351	tristate "CORDIC algorithm"
10f8113e	352	help
435a95c5 MW	353	This option provides an implementation of the CORDIC algorithm;
435a95c5 MW	354	calculations are in fixed point. Module will be called cordic.
10f8113e	355
d9c46b18	356	config MPILIB
2e5f094b	357	tristate
c6df4b17	358	select CLZ_TAB
d9c46b18 DK	359	help
	360	Multiprecision maths library from GnuPG.
	361	It is used to implement RSA digital signature verification,
	362	which is used by IMA/EVM digital signature extension.
	363
7e8dec91	364	config MPILIB_EXTRA
2e5f094b	365	bool
7e8dec91 DK	366	depends on MPILIB
7e8dec91 DK	367	help
68adcad5 DK	368	Additional sources of multiprecision maths library from GnuPG.
	369	This code is unnecessary for RSA digital signature verification,
	370	but can be compiled if needed.
7e8dec91	371
5e8898e9	372	config SIGNATURE
2e5f094b	373	tristate
be440ec7 DK	374	depends on KEYS && CRYPTO
be440ec7 DK	375	select CRYPTO_SHA1
051dbb91 DK	376	select MPILIB
	377	help
	378	Digital signature verification. Currently only RSA is supported.
	379	Implementation is done using GnuPG MPI library
	380
2de4ff7b	381	endmenu