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Date: Tue, 29 Aug 2006 22:41:02 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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Subject: Re: [PATCH 4/7] Remove the use of _syscallX macros in UML
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To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Jeff Dike <jdike@addtoit.com>, Bjoern Steinbrink <B.Steinbrink@gmx.de>, Arjan van de Ven <arjan@infradead.org>, Chase Venters <chase.venters@clientec.com>, Andrew Morton <akpm@osdl.org>, Russell King <rmk+lkml@arm.linux.org.uk>, rusty@rustcorp.com.au
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Arnd Bergmann wrote:
> User mode linux uses _syscallX() to call into the host kernel.
> The recommended way to do this is to use the syscall() function
> from libc.

Not really.

syscall() is a horrible botch; it is in fact unimplementable (without 
enormous switch statements) on a number of architectures.

	-hpa