linux-kernel - Re: [PATCH] Using Intel CRC32 instruction to accelerate CRC32c algorithm by new crypto API.

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Date:	Mon, 4 Aug 2008 22:18:22 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Austin Zhang <austin_zhang@...ux.intel.com>
Cc:	davem@...emloft.net, linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH] Using Intel CRC32 instruction to accelerate CRC32c algorithm by new crypto API.

On Mon, Aug 04, 2008 at 05:35:07AM -0400, Austin Zhang wrote:
>
> +static int crc32c_intel_cra_init(struct crypto_tfm *tfm)
> +{
> +	u32 *key = crypto_tfm_ctx(tfm);
> +
> +	*key = ~0;
> +
> +	tfm->crt_ahash.reqsize = sizeof(u32);
> +
> +	if (cpu_has_xmm4_2)
> +		return 0;
> +	else
> +		return -1;
> +}

This check needs to be moved to the module init function and
if it fails the module should not register the algorithm.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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