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

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Message-Id: <201103301417.20027.arnd@arndb.de>
Date:	Wed, 30 Mar 2011 14:17:19 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Guan Xuetao" <gxt@...c.pku.edu.cn>,
	Paul Mundt <lethal@...ux-sh.org>
Cc:	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, Guan Xuetao wrote:
> The futex functions in unicore32 are not used and verified,
> so just replaced by asm-generic version.
> 
> Signed-off-by: Guan Xuetao <gxt@...c.pku.edu.cn>

Note that the a working futex implementation would be really useful
to get efficient multithreaded applications. On uniprocessor
machines, this can easily be done by disabling interrupts, like
you also do for spinlock and atomic.

I believe we could actually copy the arch/sh/include/asm/futex-irq.h
implementation to include/asm-generic and use that whenever CONFIG_SMP
is disabled. That would also help a lot of other architectures.

	Arnd
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