[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 PERCPU_RWSEM
	boolean

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 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
22b361d1 ON	45	config PERCPU_RWSEM
	46	boolean
	47
1da177e4 LT	48	config CRC_CCITT
	49	tristate "CRC-CCITT functions"
	50	help
	51	This option is provided for the case where no in-kernel-tree
	52	modules require CRC-CCITT functions, but a module built outside
	53	the kernel tree does. Such modules that use library CRC-CCITT
	54	functions require M here.
	55
7657ec1f EP	56	config CRC16
	57	tristate "CRC16 functions"
	58	help
	59	This option is provided for the case where no in-kernel-tree
	60	modules require CRC16 functions, but a module built outside
	61	the kernel tree does. Such modules that use library CRC16
	62	functions require M here.
	63
f11f594e MP	64	config CRC_T10DIF
	65	tristate "CRC calculation for the T10 Data Integrity Field"
	66	help
	67	This option is only needed if a module that's not in the
	68	kernel tree needs to calculate CRC checks for use with the
	69	SCSI data integrity subsystem.
	70
3e7cbae7 ID	71	config CRC_ITU_T
	72	tristate "CRC ITU-T V.41 functions"
	73	help
	74	This option is provided for the case where no in-kernel-tree
	75	modules require CRC ITU-T V.41 functions, but a module built outside
	76	the kernel tree does. Such modules that use library CRC ITU-T V.41
	77	functions require M here.
	78
1da177e4	79	config CRC32
46c5801e	80	tristate "CRC32/CRC32c functions"
1da177e4	81	default y
906d66df	82	select BITREVERSE
1da177e4 LT	83	help
1da177e4 LT	84	This option is provided for the case where no in-kernel-tree
46c5801e DW	85	modules require CRC32/CRC32c functions, but a module built outside
	86	the kernel tree does. Such modules that use library CRC32/CRC32c
	87	functions require M here.
1da177e4	88
3863ef31 BP	89	config CRC32_SELFTEST
	90	bool "CRC32 perform self test on init"
	91	default n
	92	depends on CRC32
	93	help
	94	This option enables the CRC32 library functions to perform a
	95	self test on initialization. The self test computes crc32_le
	96	and crc32_be over byte strings with random alignment and length
	97	and computes the total elapsed time and number of bytes processed.
	98
5cde7656 DW	99	choice
	100	prompt "CRC32 implementation"
	101	depends on CRC32
	102	default CRC32_SLICEBY8
82edb4ba DW	103	help
	104	This option allows a kernel builder to override the default choice
	105	of CRC32 algorithm. Choose the default ("slice by 8") unless you
	106	know that you need one of the others.
5cde7656 DW	107
	108	config CRC32_SLICEBY8
	109	bool "Slice by 8 bytes"
	110	help
	111	Calculate checksum 8 bytes at a time with a clever slicing algorithm.
	112	This is the fastest algorithm, but comes with a 8KiB lookup table.
	113	Most modern processors have enough cache to hold this table without
	114	thrashing the cache.
	115
	116	This is the default implementation choice. Choose this one unless
	117	you have a good reason not to.
	118
	119	config CRC32_SLICEBY4
	120	bool "Slice by 4 bytes"
	121	help
	122	Calculate checksum 4 bytes at a time with a clever slicing algorithm.
	123	This is a bit slower than slice by 8, but has a smaller 4KiB lookup
	124	table.
	125
	126	Only choose this option if you know what you are doing.
	127
	128	config CRC32_SARWATE
	129	bool "Sarwate's Algorithm (one byte at a time)"
	130	help
	131	Calculate checksum a byte at a time using Sarwate's algorithm. This
	132	is not particularly fast, but has a small 256 byte lookup table.
	133
	134	Only choose this option if you know what you are doing.
	135
	136	config CRC32_BIT
	137	bool "Classic Algorithm (one bit at a time)"
	138	help
	139	Calculate checksum one bit at a time. This is VERY slow, but has
	140	no lookup table. This is provided as a debugging option.
	141
	142	Only choose this option if you are debugging crc32.
	143
	144	endchoice
	145
ad241528 JN	146	config CRC7
	147	tristate "CRC7 functions"
	148	help
	149	This option is provided for the case where no in-kernel-tree
	150	modules require CRC7 functions, but a module built outside
	151	the kernel tree does. Such modules that use library CRC7
	152	functions require M here.
	153
1da177e4 LT	154	config LIBCRC32C
1da177e4 LT	155	tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
93027354	156	select CRYPTO
69c35efc	157	select CRYPTO_CRC32C
1da177e4 LT	158	help
	159	This option is provided for the case where no in-kernel-tree
	160	modules require CRC32c functions, but a module built outside the
	161	kernel tree does. Such modules that use library CRC32c functions
	162	require M here. See Castagnoli93.
	163	Module will be libcrc32c.
	164
7150962d AS	165	config CRC8
	166	tristate "CRC8 function"
	167	help
	168	This option provides CRC8 function. Drivers may select this
	169	when they need to do cyclic redundancy check according CRC8
	170	algorithm. Module will be called crc8.
	171
e65e1fc2 AV	172	config AUDIT_GENERIC
	173	bool
	174	depends on AUDIT && !AUDIT_ARCH
	175	default y
	176
1da177e4 LT	177	#
	178	# compression support is select'ed if needed
	179	#
	180	config ZLIB_INFLATE
	181	tristate
	182
	183	config ZLIB_DEFLATE
	184	tristate
	185
64c70b1c RP	186	config LZO_COMPRESS
	187	tristate
	188
	189	config LZO_DECOMPRESS
	190	tristate
	191
24fa0402 LC	192	source "lib/xz/Kconfig"
24fa0402 LC	193
c8531ab3 PA	194	#
	195	# These all provide a common interface (hence the apparent duplication with
	196	# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
	197	#
	198	config DECOMPRESS_GZIP
7856a16e	199	select ZLIB_INFLATE
c8531ab3 PA	200	tristate
	201
	202	config DECOMPRESS_BZIP2
	203	tristate
	204
	205	config DECOMPRESS_LZMA
	206	tristate
	207
3ebe1243 LC	208	config DECOMPRESS_XZ
	209	select XZ_DEC
	210	tristate
	211
cacb246f AT	212	config DECOMPRESS_LZO
	213	select LZO_DECOMPRESS
	214	tristate
	215
f14f75b8 JS	216	#
	217	# Generic allocator support is selected if needed
	218	#
	219	config GENERIC_ALLOCATOR
	220	boolean
	221
1da177e4 LT	222	#
	223	# reed solomon support is select'ed if needed
	224	#
	225	config REED_SOLOMON
	226	tristate
	227
	228	config REED_SOLOMON_ENC8
	229	boolean
	230
	231	config REED_SOLOMON_DEC8
	232	boolean
	233
	234	config REED_SOLOMON_ENC16
	235	boolean
	236
	237	config REED_SOLOMON_DEC16
	238	boolean
	239
437aa565 ID	240	#
	241	# BCH support is selected if needed
	242	#
	243	config BCH
	244	tristate
	245
	246	config BCH_CONST_PARAMS
	247	boolean
	248	help
	249	Drivers may select this option to force specific constant
	250	values for parameters 'm' (Galois field order) and 't'
	251	(error correction capability). Those specific values must
	252	be set by declaring default values for symbols BCH_CONST_M
	253	and BCH_CONST_T.
	254	Doing so will enable extra compiler optimizations,
	255	improving encoding and decoding performance up to 2x for
	256	usual (m,t) values (typically such that m*t < 200).
	257	When this option is selected, the BCH library supports
	258	only a single (m,t) configuration. This is mainly useful
	259	for NAND flash board drivers requiring known, fixed BCH
	260	parameters.
	261
	262	config BCH_CONST_M
	263	int
	264	range 5 15
	265	help
	266	Constant value for Galois field order 'm'. If 'k' is the
	267	number of data bits to protect, 'm' should be chosen such
	268	that (k + mt) <= 2*m - 1.
	269	Drivers should declare a default value for this symbol if
	270	they select option BCH_CONST_PARAMS.
	271
	272	config BCH_CONST_T
	273	int
	274	help
	275	Constant value for error correction capability in bits 't'.
	276	Drivers should declare a default value for this symbol if
	277	they select option BCH_CONST_PARAMS.
	278
f7704347 DM	279	#
	280	# Textsearch support is select'ed if needed
	281	#
2de4ff7b	282	config TEXTSEARCH
f7704347	283	boolean
1da177e4	284
df3fb93a	285	config TEXTSEARCH_KMP
f7704347	286	tristate
df3fb93a	287
8082e4ed	288	config TEXTSEARCH_BM
29cb9f9c	289	tristate
8082e4ed	290
6408f79c	291	config TEXTSEARCH_FSM
f7704347	292	tristate
6408f79c	293
5db53f3e JE	294	config BTREE
	295	boolean
	296
5ea81769	297	config HAS_IOMEM
ee36c2bf	298	boolean
5ea81769	299	depends on !NO_IOMEM
087fafd1	300	select GENERIC_IO
5ea81769 AV	301	default y
	302
	303	config HAS_IOPORT
	304	boolean
	305	depends on HAS_IOMEM && !NO_IOPORT
ee36c2bf AV	306	default y
ee36c2bf AV	307
411f0f3e HC	308	config HAS_DMA
	309	boolean
	310	depends on !NO_DMA
	311	default y
	312
928923c7 GU	313	config CHECK_SIGNATURE
	314	bool
	315
aab46da0 RR	316	config CPUMASK_OFFSTACK
	317	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
	318	help
	319	Use dynamic allocation for cpumask_var_t, instead of putting
	320	them on the stack. This is a bit more expensive, but avoids
	321	stack overflow.
	322
8c384cde RR	323	config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
8c384cde RR	324	bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
525c1f92	325	depends on BROKEN
8c384cde	326
c39649c3 BH	327	config CPU_RMAP
	328	bool
	329	depends on SMP
	330
75957ba3 TH	331	config DQL
	332	bool
	333
e9cc8bdd GU	334	#
	335	# Netlink attribute parsing support is select'ed if needed
	336	#
	337	config NLATTR
	338	bool
	339
09d4e0ed PM	340	#
	341	# Generic 64-bit atomic support is selected if needed
	342	#
	343	config GENERIC_ATOMIC64
	344	bool
	345
7463449b CM	346	config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	347	def_bool y if GENERIC_ATOMIC64
	348
b411b363 PR	349	config LRU_CACHE
	350	tristate
	351
c5485a7e	352	config AVERAGE
a7a9a24d MB	353	bool "Averaging functions"
	354	help
	355	This option is provided for the case where no in-kernel-tree
	356	modules require averaging functions, but a module built outside
	357	the kernel tree does. Such modules that use library averaging
	358	functions require Y here.
	359
	360	If unsure, say N.
c5485a7e	361
c6df4b17 DM	362	config CLZ_TAB
	363	bool
	364
10f8113e	365	config CORDIC
d89ce936	366	tristate "CORDIC algorithm"
10f8113e	367	help
435a95c5 MW	368	This option provides an implementation of the CORDIC algorithm;
435a95c5 MW	369	calculations are in fixed point. Module will be called cordic.
10f8113e	370
9c1c21a0 A	371	config DDR
	372	bool "JEDEC DDR data"
	373	help
	374	Data from JEDEC specs for DDR SDRAM memories,
	375	particularly the AC timing parameters and addressing
	376	information. This data is useful for drivers handling
	377	DDR SDRAM controllers.
	378
d9c46b18	379	config MPILIB
2e5f094b	380	tristate
c6df4b17	381	select CLZ_TAB
d9c46b18 DK	382	help
	383	Multiprecision maths library from GnuPG.
	384	It is used to implement RSA digital signature verification,
	385	which is used by IMA/EVM digital signature extension.
	386
5e8898e9	387	config SIGNATURE
2e5f094b	388	tristate
be440ec7 DK	389	depends on KEYS && CRYPTO
be440ec7 DK	390	select CRYPTO_SHA1
051dbb91 DK	391	select MPILIB
	392	help
	393	Digital signature verification. Currently only RSA is supported.
	394	Implementation is done using GnuPG MPI library
	395
ab253839 DD	396	#
	397	# libfdt files, only selected if needed.
	398	#
	399	config LIBFDT
	400	bool
	401
a77ad6ea DH	402	config OID_REGISTRY
	403	tristate
	404	help
	405	Enable fast lookup object identifier registry.
	406
2de4ff7b	407	endmenu