linux-kernel - Re: [PATCH v2 2/6] crypto: crc64

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Message-ID: <20230811042423.GA1295@sol.localdomain>
Date:   Thu, 10 Aug 2023 21:24:23 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Kamlesh Gurudasani <kamlesh@...com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH v2 2/6] crypto: crc64 - add crc64-iso framework

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