linux-kernel - Re: [PATCH] crypto: ux500: do not build with -O0

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Date:	Tue, 28 Jun 2016 16:36:46 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: ux500: do not build with -O0

On Mon, Jun 27, 2016 at 11:17:40AM +0200, Arnd Bergmann wrote:
> The ARM allmodconfig build currently warngs because of the
> ux500 crypto driver not working well with the jump label
> implementation that we started using for dynamic debug, which
> breaks building with 'gcc -O0':
> 
> In file included from /git/arm-soc/include/linux/jump_label.h:105:0,
>                  from /git/arm-soc/include/linux/dynamic_debug.h:5,
>                  from /git/arm-soc/include/linux/printk.h:289,
>                  from /git/arm-soc/include/linux/kernel.h:13,
>                  from /git/arm-soc/include/linux/clk.h:16,
>                  from /git/arm-soc/drivers/crypto/ux500/hash/hash_core.c:16:
> /git/arm-soc/arch/arm/include/asm/jump_label.h: In function 'hash_set_dma_transfer':
> /git/arm-soc/arch/arm/include/asm/jump_label.h:13:7: error: asm operand 0 probably doesn't match constraints [-Werror]
>   asm_volatile_goto("1:\n\t"
> 
> Turning off compiler optimizations has never really been supported
> here, and it's only used when debugging the driver. I have not found
> a good reason for doing this here, other than a misguided attempt
> to produce more readable assembly output. Also, the driver is only
> used in obsolete hardware that almost certainly nobody will spend
> time debugging any more.
> 
> This just removes the -O0 flag from the compiler options.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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