[PATCH 6/7] lib/crc: document all the CRC library kconfig options

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Previous commits removed all the original CRC kconfig help text, since
it was oriented towards people configuring the kernel, and the options
are no longer user-selectable.  However, it's still useful for there to
be help text for kernel developers.  Add this.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 lib/Kconfig | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/lib/Kconfig b/lib/Kconfig
index 89470bb24519..4e796eaea2f4 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -138,63 +138,90 @@ config TRACE_MMIO_ACCESS
 
 source "lib/crypto/Kconfig"
 
 config CRC_CCITT
 	tristate
+	help
+	  The CRC-CCITT library functions.  Select this if your module uses any
+	  of the functions from <linux/crc-ccitt.h>.
 
 config CRC16
 	tristate
+	help
+	  The CRC16 library functions.  Select this if your module uses any of
+	  the functions from <linux/crc16.h>.
 
 config CRC_T10DIF
 	tristate
+	help
+	  The CRC-T10DIF library functions.  Select this if your module uses
+	  any of the functions from <linux/crc-t10dif.h>.
 
 config ARCH_HAS_CRC_T10DIF
 	bool
 
 config CRC_T10DIF_ARCH
 	tristate
 	default CRC_T10DIF if ARCH_HAS_CRC_T10DIF && CRC_OPTIMIZATIONS
 
 config CRC_ITU_T
 	tristate
+	help
+	  The CRC-ITU-T library functions.  Select this if your module uses
+	  any of the functions from <linux/crc-itu-t.h>.
 
 config CRC32
 	tristate
 	select BITREVERSE
+	help
+	  The CRC32 library functions.  Select this if your module uses any of
+	  the functions from <linux/crc32.h> or <linux/crc32c.h>.
 
 config ARCH_HAS_CRC32
 	bool
 
 config CRC32_ARCH
 	tristate
 	default CRC32 if ARCH_HAS_CRC32 && CRC_OPTIMIZATIONS
 
 config CRC64
 	tristate
+	help
+	  The CRC64 library functions.  Select this if your module uses any of
+	  the functions from <linux/crc64.h>.
 
 config ARCH_HAS_CRC64
 	bool
 
 config CRC64_ARCH
 	tristate
 	default CRC64 if ARCH_HAS_CRC64 && CRC_OPTIMIZATIONS
 
 config CRC4
 	tristate
+	help
+	  The CRC4 library functions.  Select this if your module uses any of
+	  the functions from <linux/crc4.h>.
 
 config CRC7
 	tristate
+	help
+	  The CRC7 library functions.  Select this if your module uses any of
+	  the functions from <linux/crc7.h>.
 
 config LIBCRC32C
 	tristate
 	select CRC32
 	help
 	  This option just selects CRC32 and is provided for compatibility
 	  purposes until the users are updated to select CRC32 directly.
 
 config CRC8
 	tristate
+	help
+	  The CRC8 library functions.  Select this if your module uses any of
+	  the functions from <linux/crc8.h>.
 
 config CRC_OPTIMIZATIONS
 	bool "Enable optimized CRC implementations" if EXPERT
 	default y
 	help
-- 
2.49.0