linux-kernel - Re: syscall macro fails upon compilation

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Date:	06 Jul 2007 13:53:41 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Gautam Singaraju <gautam.singaraju@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: syscall macro fails upon compilation

"H. Peter Anvin" <hpa@...or.com> writes:

> Gautam Singaraju wrote:
> > I use the _syscall0 macro.
> 
> Don't.  The _syscall*() macros have been unsupported for ages,

That's not true. I supported them on x86 before they were removed against
my objections.

> and broken for ever longer.

Well, most syscall() versions get 6 argument calls wrong
(not sure if that is finally fixed). _syscall*() didn't support
-fPIC for larger argument counts (_syscall0-2 never had a problem) 

So all alternatives short of writing your own stub had various
issues. If you needed 6 argument calls _syscall* was typically
the best alternative.

-Andi
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