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

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Message-Id: <201307201456.JIC35412.VFOMFJOQLOtHFS@I-love.SAKURA.ne.jp>
Date:	Sat, 20 Jul 2013 14:56:06 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	herbert@...dor.apana.org.au, tim.c.chen@...ux.intel.com
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.

Herbert Xu wrote:
> On Fri, Jul 19, 2013 at 06:31:04PM -0700, Tim Chen wrote:
> >
> > 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
> 
> That is completely expected.  I don't really think we need to
> do anything about this case.  After all, if the admin wants to
> use the optimised version for CRC_T10DIF then they could simply
> compile that in as well.
> 

Wow! ;-)

But I'd expect something like

 static int __init crc_t10dif_mod_init(void)
 {
+#if !defined(CONFIG_CRC_T10DIF_MODULE) && defined(CONFIG_CRYPTO_CRCT10DIF_PCLMUL_MODULE)
+	printk(KERN_WARNING "Consider CONFIG_CRYPTO_CRCT10DIF_PCLMUL=y for better performance\n");
+#endif
 	crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
 	return PTR_RET(crct10dif_tfm);
 }

because the admin might not be aware of this implication.
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