libcrc32c: Add crc32c_impl function (df91f56a) · Commits · e / devices / android_kernel_fairphone_FP5

This function returns a string with the currently in-use implementation of the crc32c algorithm, i.e crc32c-generic (for unoptimised, generic implementation) or crc32c-intel for the sse optimised version. This will be used by btrfs. Signed-off-by:

Nikolay Borisov <nborisov@suse.com> Acked-by:

Herbert Xu <herbert@gondor.apana.org.au> [ use crypto_shash_driver_name as suggested by Herbert ] Signed-off-by:

David Sterba <dsterba@suse.com>

include/linux/crc32c.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -5,6 +5,7 @@
		#include <linux/types.h>

		extern u32 crc32c(u32 crc, const void *address, unsigned int length);
		extern const char *crc32c_impl(void);

		/* This macro exists for backwards-compatibility. */
		#define crc32c_le crc32c

lib/libcrc32c.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -71,6 +71,12 @@ static void __exit libcrc32c_mod_fini(void)
		crypto_free_shash(tfm);
		}

		const char *crc32c_impl(void)
		{
		return crypto_shash_driver_name(tfm);
		}
		EXPORT_SYMBOL(crc32c_impl);

		module_init(libcrc32c_mod_init);
		module_exit(libcrc32c_mod_fini);