Re: [PATCH 12/40] x86, compat: convert ia32 layer to use

From: Christoph Hellwig
Date: Thu Jun 24 2010 - 10:38:23 EST

On Wed, Jun 23, 2010 at 12:23:44PM -0700, H. Peter Anvin wrote:
> >> arch/s390/kernel/sys_s390.c:SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset,
> >> arch/sparc/kernel/sys_sparc_64.c:SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
> >
> > In fact we sort of wanted to standardize the name of arch overriden compat
> > syscalls, so that userspace programs playing with syscalls tracing won't have
> > to deal with arch naming differences.
> >
> That seems totally wrong in so many ways.
> What userspace sees is the system call name, e.g. fallocate or pipe. It
> should *not* be visible to userspace that there is an arch-specici
> implementation.

This is really just the in-kernel name. With tracing we export it to
userspace, so agreed that we should stay consistent. We need a good
way to override both native and compat system calls with arch version
to always export the sys_ / compat_sys names.

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