linux-kernel - Re: [PATCH] x86, crypto: Check if gas supports CRC32

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Date:	Thu, 31 Jul 2014 00:11:27 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Mathias Krause <minipli@...glemail.com>
Cc:	x86-ml <x86@...nel.org>, linux-crypto@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, crypto: Check if gas supports CRC32

On Wed, Jul 30, 2014 at 11:28:14PM +0200, Mathias Krause wrote:
> Gah, CONFIG_AS_CRC32 gets defined as a preprocessor symbol only so
> cannot be used in makefiles. So crc32c-pcl-intel-asm_64.S needs a
> "#ifdef CONFIG_AS_CRC32" guard and still be compiled for CONFIG_64BIT,
> as it is now. It'll be an empty object for older binutils versions not
> supporting the crc32 instruction.

Yeah, that makes it all even simpler, thanks!

We're still b0rked though:

arch/x86/crypto/crct10dif-pcl-asm_64.S: Assembler messages:
arch/x86/crypto/crct10dif-pcl-asm_64.S:147: Error: no such instruction: `pclmulqdq $0x0,%xmm10,%xmm0'
arch/x86/crypto/crct10dif-pcl-asm_64.S:148: Error: no such instruction: `pclmulqdq $0x11,%xmm10,%xmm8'
arch/x86/crypto/crct10dif-pcl-asm_64.S:149: Error: no such instruction: `pclmulqdq $0x0,%xmm10,%xmm1'
...

and need checking for more instructions. I'll play with this more
tomorrow.

Good night :-)

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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