linux-kernel - Re: [PATCH] Using Intel CRC32 instruction to accelerate CRC32c algorithm by new crypto API -V2.

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Date:	Tue, 5 Aug 2008 20:39:44 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Austin Zhang <austin_zhang@...ux.intel.com>
Cc:	dwmw2@...radead.org, davem@...emloft.net, randy.dunlap@...cle.com,
	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 -V2.

Hi Austin:

On Tue, Aug 05, 2008 at 07:56:43AM -0400, Austin Zhang wrote:
> Revised by comments:
> Move hardware feature detect into module init;
> Revise dependency in Kconfig;
> Revise variable type;
> Add information output while module loading failed; 
>  
> 
> >From NHM processor onward, Intel processors can support hardware
> accelerated
> CRC32c algorithm with the new CRC32 instruction in SSE 4.2 instruction
> set.
> The patch detects the availability of the feature, and chooses the most
> proper
> way to calculate CRC32c checksum.
> Byte code instructions are used for compiler compatibility.
> No MMX / XMM registers is involved in the implementation.
> 
> Signed-off-by: Austin Zhang <austin.zhang@...el.com>
> Signed-off-by: Kent Liu <kent.liu@...el.com>

I tried to apply your patch but it doesn't work:

$ git apply --check --whitespace=error-all ~/p
fatal: patch fragment without header at line 34: @@ -0,0 +1,190 @@
$

Looks like your mail client has folded all the lines.

> +u32 crc32c_intel_le_hw_byte(u32 crc, unsigned char const *data, size_t
> length)

While you're fixing that up please add a static here.

> +u32 __pure crc32c_intel_le_hw(u32 crc, unsigned char const *p, size_t

And here.

Thanks,
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