linux-kernel - Re: [PATCH] ARM64: fix building without CONFIG

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Message-ID: <20151125121628.GE3109@e104818-lin.cambridge.arm.com>
Date:	Wed, 25 Nov 2015 12:16:28 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	will.deacon@....com, linux-arch@...r.kernel.org,
	Michal Simek <monstr@...str.eu>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM64: fix building without CONFIG_UID16

On Fri, Nov 20, 2015 at 12:12:21PM +0100, Arnd Bergmann wrote:
> As reported by Michal Simek, building an ARM64 kernel with CONFIG_UID16
> disabled currently fails because the system call table still needs to
> reference the individual function entry points that are provided by
> kernel/sys_ni.c in this case, and the declarations are hidden inside
> of #ifdef CONFIG_UID16:
> 
> arch/arm64/include/asm/unistd32.h:57:8: error: 'sys_lchown16' undeclared here (not in a function)
>  __SYSCALL(__NR_lchown, sys_lchown16)
> 
> I believe this problem only exists on ARM64, because older architectures
> tend to not need declarations when their system call table is built
> in assembly code, while newer architectures tend to not need UID16
> support. ARM64 only uses these system calls for compatibility with
> 32-bit ARM binaries.
> 
> This changes the CONFIG_UID16 check into CONFIG_HAVE_UID16, which is
> set unconditionally on ARM64 with CONFIG_COMPAT, so we see the
> declarations whenever we need them, but otherwise the behavior is
> unchanged.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: stable@...r.kernel.org
> Fixes: af1839eb4bd4 ("Kconfig: clean up the long arch list for the UID16 config option")

Applied. Thank.

-- 
Catalin
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