linux-kernel - Re: 64-syscall args on 32-bit vs syscall()

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Date:	Thu, 18 Mar 2010 09:58:40 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ulrich Drepper <drepper@...hat.com>, munroesj@...ibm.com,
	David Miller <davem@...emloft.net>, ralf@...ux-mips.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...savvy.com, torvalds@...ux-foundation.org
Subject: Re: 64-syscall args on 32-bit vs syscall()

On Wed, 2010-03-17 at 13:53 -0700, H. Peter Anvin wrote:
> > Yeah, whatever, I don't mind what technique you use for the
> versionning,
> > ultimately, if the approach works, we can look at those details :-)
> We
> > -do- need the macro to strip the dummy argument though, unless we
> use
> > a slightly different technique which is to make the __sysno argument
> > itself 64-bit, which works as well I believe.
> >
> 
> It seems cleaner to do it that way (with a 64-bit sysno arg.) 

Right. Now if we can get Ulrich to actually put 2 and 2 together and
admit that it actually works without breaking anything existing (at
least for my arch but I wouldn't be surprised if that was the case for
others), I would be even happier :-)

Steve, any chance you can cook up a glibc patch to test with ? Maybe
making it powerpc specific for now ?

Cheers,
Ben.


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