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

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Message-ID: <1268685311.2335.38.camel@pasglop>
Date:	Tue, 16 Mar 2010 07:35:11 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	David Miller <davem@...emloft.net>, drepper@...hat.com,
	ralf@...ux-mips.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel@...savvy.com,
	torvalds@...ux-foundation.org, munroesj@...ux.vnet.ibm.com
Subject: Re: 64-syscall args on 32-bit vs syscall()

On Mon, 2010-03-15 at 12:41 -0700, H. Peter Anvin wrote:
> I don't see why syscall() can't change the type for its first argument
> -- it seems to be exactly what symbol versioning is for.
> 
> Doesn't change the fact that it is fundamentally broken, of course. 

No need to change the type of the first arg and go for symbol
versionning if you do something like I proposed earlier, there will be
no conflict between syscall() and __syscall() and both variants can
exist.

Cheers,
Ben.


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