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Re: sys_syscall patch.

To: Ralf Baechle <ralf@oss.sgi.com>
Subject: Re: sys_syscall patch.
From: Carsten Langgaard <carstenl@mips.com>
Date: Mon, 24 Jun 2002 12:46:41 +0200
Cc: linux-mips@oss.sgi.com
References: <3D16E14C.5C8D2FAD@mips.com> <20020624115452.A25138@dea.linux-mips.net> <3D16EF3C.BCCB020@mips.com> <20020624122450.A25659@dea.linux-mips.net>
Sender: owner-linux-mips@oss.sgi.com
Ralf Baechle wrote:

> On Mon, Jun 24, 2002 at 12:06:52PM +0200, Carsten Langgaard wrote:
>
> >
> > At least it makes my system work as well as for the 32-bit kernel.
>
> What programs btw are using syscall()?  To be honest I don't recall one ...

/sbin/rpc.lockd.
It use syscall() to indirectly call the 'sys_nfsservctl' syscall, why it
doesn't do the syscall directly is beyond me.


>
> Looking more into it I found a nice showstopper - a few functions like
> _sys_sigsuspend() expect a struct pt_regs on the stack.  That's only
> working if we call those functions directly from the exception handler.
> It won't work if we have another function's stackframe - in this case
> sys_syscall()'s there also ...
>
>   Ralf

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