linux-kernel - Re: [PATCH] unicore32 fix: remove arch-specific futex support

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Message-Id: <201103301440.03479.arnd@arndb.de>
Date:	Wed, 30 Mar 2011 14:40:03 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH] unicore32 fix: remove arch-specific futex support

On Wednesday 30 March 2011, Thomas Gleixner wrote:
> The problem is that you need cmpxchg in user space as well.
> 
> ARM does this with some syscall magic for machines which do not have
> cmpxchg.

Ah, right. I wonder how sh does it.

I also remember that the original unicore32 ABI had support for a cmpxchg
system call, but that was removed with the move to the generic syscall
table.

It is of course possible to add it back using the __NR_arch_specific_syscall
entry point.

	Arnd
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