linux-kernel - Re: randconfig build error with next-20150529, in crypto/jitterentropy.c

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Message-ID: <2802354.BKbRJQHDPP@tauon.atsec.com>
Date:	Tue, 09 Jun 2015 00:36:07 +0200
From:	Stephan Mueller <smueller@...onox.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Jim Davis <jim.epost@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto <linux-crypto@...r.kernel.org>
Subject: Re: randconfig build error with next-20150529, in crypto/jitterentropy.c

Am Monday 08 June 2015, 12:54:12 schrieb Guenter Roeck:

Hi Guenter,

Thanks for the note.

...
>
>---
>
>openrisc:defconfig:
>
>In file included from ./arch/openrisc/include/asm/timex.h:23:0,
>	...
>	from crypto/jitterentropy.c:52:
>./arch/openrisc/include/asm/spr.h: In function 'jent_loop_shuffle':
>./arch/openrisc/include/asm/spr.h:30:2: warning: asm operand 1 probably
>doesn't match constraints
>./arch/openrisc/include/asm/spr.h:30:2: error: impossible constraint in 'asm'

I received this one also before. But that seems to be an error on the OpenRISC 
platform as the random_get_entropy() function or the get_cycles function is 
not implemented as defined.

The crypto code uses the following which triggers the issue:

        __u64 tmp = 0;

        tmp = random_get_entropy();

That one seems to be an appropriate use of random_get_entropy() which on 
almost all arches is an alias for get_cycles().
>
>---
>
>nios2:3c120_defconfig:
>
>ERROR: "get_cycles" [crypto/jitterentropy.ko] undefined!


Ciao
Stephan
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