--- lib/Kconfig
+++ lib/Kconfig
@@ -16,6 +16,12 @@ config BITREVERSE
config RATIONAL
boolean
+config GENERIC_STRNCPY_FROM_USER
+ bool
+
+config GENERIC_STRNLEN_USER
+ bool
+
config GENERIC_FIND_FIRST_BIT
bool
@@ -51,14 +57,59 @@ config CRC_ITU_T
functions require M here.
config CRC32
- tristate "CRC32 functions"
+ tristate "CRC32/CRC32c functions"
default y
select BITREVERSE
help
This option is provided for the case where no in-kernel-tree
- modules require CRC32 functions, but a module built outside the
- kernel tree does. Such modules that use library CRC32 functions
- require M here.
+ 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
+
+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 that this shouldn't be
+ a problem.
+
+ If you don't know which to choose, choose this one.
+
+config CRC32_SLICEBY4
+ bool "Slice by 4 bytes"
+ help
+ Calculate checksum 8 bytes at a time with a clever slicing algorithm.
+ This is reasonably fast, but has a 4KiB lookup table.
+
+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.
+
+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.
+
+endchoice
config CRC7
tristate "CRC7 functions"
projects / ziggy471-sgn2-jb.git / blobdiff