linux-kernel - Re: syscall macro fails upon compilation

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Date:	Fri, 06 Jul 2007 09:11:08 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Gautam Singaraju <gautam.singaraju@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: syscall macro fails upon compilation

Andi Kleen wrote:
> "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.
> 

They were *always* broken for 64-bit arguments on 32-bit machines, however.

	-hpa
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