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lib/crc7: unexport crc7_be_syndrome_table

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Since neither crc7_be_syndrome_table nor crc7_be_byte() are used outside
lib/crc7.c, fold them into lib/crc7.c.

Link: https://lore.kernel.org/r/20250304224052.157915-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers
2025-03-04 14:40:52 -08:00
parent 415999ea30
commit f3e5fe4adf
2 changed files with 2 additions and 11 deletions
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7
include/linux/crc7.h
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@@ -3,13 +3,6 @@
#define _LINUX_CRC7_H #define _LINUX_CRC7_H
#include <linux/types.h> #include <linux/types.h>
extern const u8 crc7_be_syndrome_table[256];
static inline u8 crc7_be_byte(u8 crc, u8 data)
{
return crc7_be_syndrome_table[crc ^ data];
}
extern u8 crc7_be(u8 crc, const u8 *buffer, size_t len); extern u8 crc7_be(u8 crc, const u8 *buffer, size_t len);
#endif #endif

6
lib/crc7.c
View File

@@ -7,14 +7,13 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/crc7.h> #include <linux/crc7.h>
/* /*
* Table for CRC-7 (polynomial x^7 + x^3 + 1). * Table for CRC-7 (polynomial x^7 + x^3 + 1).
* This is a big-endian CRC (msbit is highest power of x), * This is a big-endian CRC (msbit is highest power of x),
* aligned so the msbit of the byte is the x^6 coefficient * aligned so the msbit of the byte is the x^6 coefficient
* and the lsbit is not used. * and the lsbit is not used.
*/ */
const u8 crc7_be_syndrome_table[256] = { static const u8 crc7_be_syndrome_table[256] = {
0x00, 0x12, 0x24, 0x36, 0x48, 0x5a, 0x6c, 0x7e, 0x00, 0x12, 0x24, 0x36, 0x48, 0x5a, 0x6c, 0x7e,
0x90, 0x82, 0xb4, 0xa6, 0xd8, 0xca, 0xfc, 0xee, 0x90, 0x82, 0xb4, 0xa6, 0xd8, 0xca, 0xfc, 0xee,
0x32, 0x20, 0x16, 0x04, 0x7a, 0x68, 0x5e, 0x4c, 0x32, 0x20, 0x16, 0x04, 0x7a, 0x68, 0x5e, 0x4c,
@@ -48,7 +47,6 @@ const u8 crc7_be_syndrome_table[256] = {
0x1c, 0x0e, 0x38, 0x2a, 0x54, 0x46, 0x70, 0x62, 0x1c, 0x0e, 0x38, 0x2a, 0x54, 0x46, 0x70, 0x62,
0x8c, 0x9e, 0xa8, 0xba, 0xc4, 0xd6, 0xe0, 0xf2 0x8c, 0x9e, 0xa8, 0xba, 0xc4, 0xd6, 0xe0, 0xf2
}; };
EXPORT_SYMBOL(crc7_be_syndrome_table);
/** /**
* crc7_be - update the CRC7 for the data buffer * crc7_be - update the CRC7 for the data buffer
@@ -65,7 +63,7 @@ EXPORT_SYMBOL(crc7_be_syndrome_table);
u8 crc7_be(u8 crc, const u8 *buffer, size_t len) u8 crc7_be(u8 crc, const u8 *buffer, size_t len)
{ {
while (len--) while (len--)
crc = crc7_be_byte(crc, *buffer++); crc = crc7_be_syndrome_table[crc ^ *buffer++];
return crc; return crc;
} }
EXPORT_SYMBOL(crc7_be); EXPORT_SYMBOL(crc7_be);