linux-kernel - Re: [PATCH 3/4] powerpc/crypto: add 842 hardware compression driver

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Date:	Fri, 20 Jul 2012 15:33:30 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Kent Yoder <key@...ux.vnet.ibm.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH 3/4] powerpc/crypto: add 842 hardware compression driver

On Thu, 2012-07-19 at 09:42 -0500, Seth Jennings wrote:
> This patch adds the driver for interacting with the 842
> compression accelerator on IBM Power7+ systems.

...

> +struct nx842_slentry {
> +	unsigned long ptr; /* Absolute address (use virt_to_abs()) */
> /+	unsigned long len;
> +};

These days virt_to_abs() is just __pa() - ie. convert to a real address.

So you should just use __pa().

And you also need to be certain that you only call it on addresses where
that makes sense, ie. not vmalloc etc.

cheers

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