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Date: Mon, 15 Jun 2020 16:43:10 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 2/6] exec: simplify the compat syscall handling
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To: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Hellwig <hch@lst.de>, Al Viro <viro@zeniv.linux.org.uk>, Luis Chamberlain <mcgrof@kernel.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, the arch/x86 maintainers <x86@kernel.org>, "open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>, Parisc List <linux-parisc@vger.kernel.org>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, linux-s390 <linux-s390@vger.kernel.org>, sparclinux <sparclinux@vger.kernel.org>, Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>, linux-arch <linux-arch@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>

On Mon, Jun 15, 2020 at 04:40:28PM +0200, Arnd Bergmann wrote:
> > ld: arch/x86/entry/syscall_x32.o:(.rodata+0x1040): undefined reference to
> > `__x32_sys_execve'
> > ld: arch/x86/entry/syscall_x32.o:(.rodata+0x1108): undefined reference to
> > `__x32_sys_execveat'
> > make: *** [Makefile:1139: vmlinux] Error 1
> 
> Ah, I see: it's marked x32-only, so arch/x86/entry/syscall_x32.c
> uses the __x32 prefix instead of the __x64 one. Marking it 'common'
> instead would make it work, but also create an extra entry point
> for native processes, something that commit
> 6365b842aae4 ("x86/syscalls: Split the x32 syscalls into their own table")
> was trying to avoid.

Marking it common also doesn't compile at all because __NR_execve
and __NR_execveat get redefined in unistd_64.h.  I then tried to rename
the x32 versions, which failed in yet another way.  At that point I gave
up instead of digging myself into a deeper hole..