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-rw-r--r--lib/Kconfig17
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index e86975bfca6a..f323b85ad11c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -18,6 +18,23 @@ config RAID6_PQ_BENCHMARK
Benchmark all available RAID6 PQ functions on init and choose the
fastest one.
+config PACKING
+ bool "Generic bitfield packing and unpacking"
+ default n
+ help
+ This option provides the packing() helper function, which permits
+ converting bitfields between a CPU-usable representation and a
+ memory representation that can have any combination of these quirks:
+ - Is little endian (bytes are reversed within a 32-bit group)
+ - The least-significant 32-bit word comes first (within a 64-bit
+ group)
+ - The most significant bit of a byte is at its right (bit 0 of a
+ register description is numerically 2^7).
+ Drivers may use these helpers to match the bit indices as described
+ in the data sheets of the peripherals they are in control of.
+
+ When in doubt, say N.
+
config BITREVERSE
tristate