[PATCH 2/6] exec: simplify the compat syscall handling

[Christoph Hellwig]

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..