Re: [PATCH v2 2/6] crypto: crc64 - add crc64-iso framework

[Eric Biggers <ebiggers@kernel.org>]

On Fri, Aug 11, 2023 at 12:58:49AM +0530, Kamlesh Gurudasani wrote:
> diff --git a/lib/crc64-iso.c b/lib/crc64-iso.c
> new file mode 100644
> index 000000000000..d6e803124fa0
[...]
> +u64 crc64_iso_update(u64 crc, const unsigned char *buffer, size_t len)
> +{
> +	struct {
> +		struct shash_desc shash;
> +		u64 crc;
> +	} desc;
> +	int err;
> +
> +	if (static_branch_unlikely(&crc64_iso_fallback))
> +		return crc64_iso_generic(crc, buffer, len);
> +
> +	rcu_read_lock();
> +	desc.shash.tfm = rcu_dereference(crc64_iso_tfm);
> +	desc.crc = crc;
> +	err = crypto_shash_update(&desc.shash, buffer, len);
> +	rcu_read_unlock();
> +
> +	WARN_ON_ONCE(err);
> +
> +	return desc.crc;
> +}
> +EXPORT_SYMBOL_GPL(crc64_iso_update);
> +
> +u64 crc64_iso(const unsigned char *buffer, size_t len)
> +{
> +	return crc64_iso_update(0, buffer, len);
> +}
> +EXPORT_SYMBOL_GPL(crc64_iso);

These functions are never called.

Why are you trying to add unused code to the kernel?

- Eric