linux-kernel - Re: linux-next: Tree for May 15 (crypto /crct10dif)

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Date:	Thu, 16 May 2013 09:59:12 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Xiong Zhou <jencce.kernel@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Linux-Next <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-crypto@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>
Subject: Re: linux-next: Tree for May 15 (crypto /crct10dif)

On Thu, 2013-05-16 at 09:22 +0200, Geert Uytterhoeven wrote:
> On Thu, May 16, 2013 at 5:57 AM, Xiong Zhou <jencce.kernel@...il.com> wrote:
> > --- a/crypto/Kconfig
> > +++ b/crypto/Kconfig
> > @@ -378,6 +378,7 @@ config CRYPTO_CRC32_PCLMUL
> >
> >  config CRYPTO_CRCT10DIF
> >         tristate "CRCT10DIF algorithm"
> > +       depends on CRC_T10DIF
> 
> This is a library symbol, so "select CRC_T10DIF"?
> 
> >         select CRYPTO_HASH
> >         help
> >           CRC T10 Data Integrity Field computation is being cast as
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 

This is the fix I think that will resolve the build issues.  The generic
crc-t10dif transform depends on the library function crc_t10dif_generic
in lib/crc-t10dif.c, so "depends on CRC_T10DIF" for CRYPTO_CRCT10DIF is
needed.

Now for CRC_T10DIF, we should use select CRYPTO_HASH, so it can try to
allocate a T10DIF transform if it is available.  If not, it will simply
use the crc_t10dif_generic function. Loading the
generic t10dif crypto transform is not mandatory for the library
function crc_t10dif. 

Thanks for catching the issues.

Tim

Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
---
diff --git a/crypto/Kconfig b/crypto/Kconfig
index d1ca631..015df24 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -379,6 +379,7 @@ config CRYPTO_CRC32_PCLMUL
 config CRYPTO_CRCT10DIF
 	tristate "CRCT10DIF algorithm"
 	select CRYPTO_HASH
+	depends on CRC_T10DIF
 	help
 	  CRC T10 Data Integrity Field computation is being cast as
 	  a crypto transform.  This allows for faster crc t10 diff
diff --git a/lib/Kconfig b/lib/Kconfig
index 0cee056..e6ad2e4 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -63,7 +63,7 @@ config CRC16
 
 config CRC_T10DIF
 	tristate "CRC calculation for the T10 Data Integrity Field"
-	select CRYPTO_CRCT10DIF
+	select CRYPTO_HASH
 	help
 	  This option is only needed if a module that's not in the
 	  kernel tree needs to calculate CRC checks for use with the


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