linux-kernel - Re: [PATCH v2] staging: skein: Loadable Module Support

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Date:	Wed, 22 Oct 2014 12:24:49 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Eric Rost <eric.rost@...abylon.net>
Cc:	gregkh@...uxfoundation.org, jake@....net, antonysaraev@...il.com,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: skein: Loadable Module Support

On Wed, Oct 22, 2014 at 10:54:26AM -0500, Eric Rost wrote:
> On Wed, 2014-10-22 at 11:10 -0400, Jason Cooper wrote:
> > At some point, Eric Rost wrote:
...
> > > diff --git a/drivers/staging/skein/Makefile b/drivers/staging/skein/Makefile
> > > index a14aadd..1be01fe 100644
> > > --- a/drivers/staging/skein/Makefile
> > > +++ b/drivers/staging/skein/Makefile
> > > @@ -5,5 +5,11 @@ obj-$(CONFIG_CRYPTO_SKEIN) +=   skein.o \
> > >  				skein_api.o \
> > >  				skein_block.o
> > >  
> > > +obj-$(CONFIG_CRYPTO_SKEIN_256) += skein256_generic.o
> > > +
> > > +obj-$(CONFIG_CRYPTO_SKEIN_512) += skein512_generic.o
> > > +
> > > +obj-$(CONFIG_CRYPTO_SKEIN_1024) += skein1024_generic.o
> > > +
> > 
> > This isn't really doing what we want.  You'll have loadable modules, but
> > the actual code will still be built into the kernel.
> > 
> > >  obj-$(CONFIG_CRYPTO_THREEFISH) += threefish_block.o \
> > >  				  threefish_api.o
> > > diff --git a/drivers/staging/skein/skein.c b/drivers/staging/skein/skein.c
> > > index 8cc8358..2138e22 100644
> > > --- a/drivers/staging/skein/skein.c
> > > +++ b/drivers/staging/skein/skein.c
> > > @@ -11,6 +11,7 @@
> > >  #define  SKEIN_PORT_CODE /* instantiate any code in skein_port.h */
> > >  
> > >  #include <linux/string.h>       /* get the memcpy/memset functions */
> > > +#include <linux/export.h>
> > >  #include "skein.h" /* get the Skein API definitions   */
> > >  #include "skein_iv.h"    /* get precomputed IVs */
> > >  #include "skein_block.h"
> > > @@ -73,6 +74,7 @@ int skein_256_init(struct skein_256_ctx *ctx, size_t hash_bit_len)
> > >  
> > >  	return SKEIN_SUCCESS;
> > >  }
> > > +EXPORT_SYMBOL(skein_256_init);
> > 
> > Once the above is corrected, these shouldn't be necessary.
> > 
> Will give it a whirl, I was having problems with undefined symbols at
> linking even when I was building it as one module, but it may have been
> something else

Try just changing CRYPTO_SKEIN to a tri-state, and adding your
skein_generic.o to the obj-$(CONFIG_CRYPTO_SKEIN) list.

You'll probably have to collapse CRYPTO_THREEFISH into CRYPTO_SKEIN for
now.  Let's get the crypto API registration proper first, them we can
focus on the loadable module bit.

thx,

Jason.
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