linux-kernel - Re: Using _syscall3 to manipulate files in a driver

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Date:	Mon, 1 Jan 2007 23:59:43 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Jon Smirl <jonsmirl@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Using _syscall3 to manipulate files in a driver

On Sun, Dec 31, 2006 at 12:13:52PM -0500, Jon Smirl wrote:
> I have the source code for a vendor written driver that is targeted at
> 2.6.9. It includes this and then proceeds to manipulate files from the
> driver.
> 
> asmlinkage _syscall3(int,write,int,fd,const char *,buf,off_t,count)
> asmlinkage _syscall3(int,read,int,fd,char *,buf,off_t,count)
> asmlinkage _syscall3(int,open,const char *,file,int,flag,int,mode)
> asmlinkage _syscall1(int,close,int,fd)
> 
> What is the simplest way to get open/close/read/write working under
> 2.6.20-rc2? I know this is horrible and shouldn't be done, I just want
> to get the driver working long enough to see if it is worth saving.
> I'm on x86.
> 
In-kernel syscalls were removed by f5738ceed46782aea7663d62cb6398eb05fc4ce0.
You can stub them back in if you want a quick and lame fix for the
driver, but you're better off rewriting it to behave sensibly rather than
wasting your time on vendor hacks.
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