linux-kernel - Re: [PATCH 3.11-rc1] crypto: Fix boot failure due to moduledependency.

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Date:	Sat, 20 Jul 2013 11:19:17 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	tim.c.chen@...ux.intel.com, herbert@...dor.apana.org.au
Cc:	hpa@...or.com, gregkh@...uxfoundation.org, rjw@...ysocki.net,
	rafael.j.wysocki@...el.com, linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org, ak@...ux.intel.com,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 3.11-rc1] crypto: Fix boot failure due to moduledependency.

Tim Chen wrote:
> On Fri, 2013-07-19 at 16:37 -0700, Tim Chen wrote:
> > Herbert,
> > 
> > I've tried the module alias approach (see my earlier mail with patch) 
> > but it didn't seem to load things properly.  Can you check to see if 
> > there's anything I did incorrectly.
> > 
> > Tim
> 
> I fixed a missing request_module statement in crct10dif library.  
> So now things work if I have the following config:
> 
> CONFIG_CRYPTO_CRCT10DIF=m
> CONFIG_CRYPTO_CRCT10DIF_PCLMUL=m
> CONFIG_CRC_T10DIF=m
> 
> However, when I have the library and generic algorithm compiled in,
> I do not see the PCLMULQDQ version loaded.
> 
> CONFIG_CRYPTO_CRCT10DIF=y
> CONFIG_CRYPTO_CRCT10DIF_PCLMUL=m
> CONFIG_CRC_T10DIF=y
> 
> Perhaps I am initiating the crct10dif library at a really early
> stage when things are compiled in, where the module is not in 
> initramfs?  In that case, perhaps we should only allow 
> PCLMUL version to be compiled in
> and not exist as a module?

I think that use of request_module("crct10dif") does not help loading
crct10dif-pclmul.ko when CONFIG_CRC_T10DIF=y CONFIG_CRYPTO_CRCT10DIF_PCLMUL=m ,
for there is no / directory (note that the initramfs is not yet mounted as /
for loading modules which are not in vmlinux) when any module_init() functions
which are in vmlinux are called.
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