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

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Message-ID: <20100624143717.GA7565@lst.de>
Date:	Thu, 24 Jun 2010 16:37:17 +0200
From:	Christoph Hellwig <hch@....de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Baron <jbaron@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	linuxppc-dev@...abs.org, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ian Munsie <imunsie@....ibm.com>,
	Greg Ungerer <gerg@...inux.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 12/40] x86, compat: convert ia32 layer to use

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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