diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-08-27 13:02:42 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-09-10 16:09:27 +0100 |
| commit | 9784d82db3eb3de7851e5a3f4a2481607de2452c (patch) | |
| tree | 4af04116f41e1e1ca3142f1e5ccb6bb8f015df77 /lib/crc32.c | |
| parent | cbbac1c3e6a80f32a692703d764f432d357378ec (diff) | |
| download | lwn-9784d82db3eb3de7851e5a3f4a2481607de2452c.tar.gz lwn-9784d82db3eb3de7851e5a3f4a2481607de2452c.zip | |
lib/crc32: make core crc32() routines weak so they can be overridden
Allow architectures to drop in accelerated CRC32 routines by making
the crc32_le/__crc32c_le entry points weak, and exposing non-weak
aliases for them that may be used by the accelerated versions as
fallbacks in case the instructions they rely upon are not available.
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'lib/crc32.c')
| -rw-r--r-- | lib/crc32.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/crc32.c b/lib/crc32.c index a6c9afafc8c8..45b1d67a1767 100644 --- a/lib/crc32.c +++ b/lib/crc32.c @@ -183,21 +183,21 @@ static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p, } #if CRC_LE_BITS == 1 -u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) +u32 __pure __weak crc32_le(u32 crc, unsigned char const *p, size_t len) { return crc32_le_generic(crc, p, len, NULL, CRC32_POLY_LE); } -u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) +u32 __pure __weak __crc32c_le(u32 crc, unsigned char const *p, size_t len) { return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE); } #else -u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) +u32 __pure __weak crc32_le(u32 crc, unsigned char const *p, size_t len) { return crc32_le_generic(crc, p, len, (const u32 (*)[256])crc32table_le, CRC32_POLY_LE); } -u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) +u32 __pure __weak __crc32c_le(u32 crc, unsigned char const *p, size_t len) { return crc32_le_generic(crc, p, len, (const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE); @@ -206,6 +206,9 @@ u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) EXPORT_SYMBOL(crc32_le); EXPORT_SYMBOL(__crc32c_le); +u32 crc32_le_base(u32, unsigned char const *, size_t) __alias(crc32_le); +u32 __crc32c_le_base(u32, unsigned char const *, size_t) __alias(__crc32c_le); + /* * This multiplies the polynomials x and y modulo the given modulus. * This follows the "little-endian" CRC convention that the lsbit |