linux-kernel - Re: [PATCH v6 04/20] arm64: change some CONFIG_COMPAT over to use CONFIG_AARCH32

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Date:	Mon, 28 Dec 2015 17:01:15 +0800
From:	"Zhangjian (Bamvor)" <bamvor.zhangjian@...wei.com>
To:	Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>,
	<ynorov@...iumnetworks.com>, <arnd@...db.de>,
	<catalin.marinas@....com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC:	<pinskia@...il.com>, <Prasun.Kapoor@...iumnetworks.com>,
	<schwab@...e.de>, <Nathan_Lynch@...tor.com>, <agraf@...e.de>,
	<klimov.linux@...il.com>, <broonie@...nel.org>,
	<jan.dakinevich@...il.com>, <ddaney.cavm@...il.com>,
	<philipp.tomsich@...obroma-systems.com>, <joseph@...esourcery.com>,
	<christoph.muellner@...obroma-systems.com>, <apinski@...ium.com>,
	<Andrew.Pinski@...iumnetworks.com>,
	"Zhangjian (Bamvor)" <bamvor.zhangjian@...wei.com>,
	<baixin1@...wei.com>
Subject: Re: [PATCH v6 04/20] arm64: change some CONFIG_COMPAT over to use
 CONFIG_AARCH32_EL0 instead

Fix the title.

On 16:43 2015/12/28, Bamvor Jian Zhang wrote:
> I feel we need something like this to avoid the failure of compiling
> when build with ARM64_ILP32(which will select COMPAT) and
> ARMV8_DEPRECATED (which depends on the opcodes.o).
>
>  From f8b8ffdb449491ecf8ba465238bbdb4625a74ac0 Mon Sep 17 00:00:00 2001
> From: Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>
> Date: Mon, 28 Dec 2015 12:57:46 +0800
> Subject: [PATCH] arm64: compat: fix wrong dependency of ARMV8_DEPRECATED
>
> When compile with ARM64_ILP32, ARMV8_DEPRECATED will be selected due
> to the dependency of COMPAT. It leads to the following error:
>      LD      init/built-in.o
>      arch/arm64/kernel/built-in.o: In function `cp15barrier_handler':
>      /home/bamvor/works/source/kernel/linux_ilp32/arch/arm64/kernel/armv8_deprecated.c:467: undefined reference to `arm_check_condition'
>      /home/bamvor/works/source/kernel/linux_ilp32/arch/arm64/kernel/armv8_deprecated.c:467: undefined reference to `arm_check_condition'
>      arch/arm64/kernel/built-in.o: In function `swp_handler':
>      /home/bamvor/works/source/kernel/linux_ilp32/arch/arm64/kernel/armv8_deprecated.c:386: undefined reference to `arm_check_condition'
>      /home/bamvor/works/source/kernel/linux_ilp32/arch/arm64/kernel/armv8_deprecated.c:386: undefined reference to `arm_check_condition'
>      Makefile:927: recipe for target 'vmlinux' failed
>      make: *** [vmlinux] Error 1
>
> This patch fix this by updating the dependency from COMPAT to
> AARCH32_EL0.
>
> Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>
> ---
>   arch/arm64/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index deec37a..e52fd03 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -509,7 +509,7 @@ config FORCE_MAX_ZONEORDER
>
>   menuconfig ARMV8_DEPRECATED
>   	bool "Emulate deprecated/obsolete ARMv8 instructions"
> -	depends on COMPAT
> +	depends on AARCH32_EL0
>   	help
>   	  Legacy software support may require certain instructions
>   	  that have been deprecated or obsoleted in the architecture.
>

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