linux-kernel - Re: IGMP and rwlock: Dead ocurred again on TILEPro

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Message-Id: <20110217.145333.232751283.davem@davemloft.net>
Date:	Thu, 17 Feb 2011 14:53:33 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	cmetcalf@...era.com
Cc:	xiyou.wangcong@...il.com, cypher.w@...il.com,
	linux-kernel@...r.kernel.org, eric.dumazet@...il.com,
	netdev@...r.kernel.org
Subject: Re: IGMP and rwlock: Dead ocurred again on TILEPro

From: Chris Metcalf <cmetcalf@...era.com>
Date: Thu, 17 Feb 2011 17:49:46 -0500

> The fix is to disable interrupts for the arch_read_lock family of methods. 

How does that help handle the race when it happens between different
cpus, instead of between IRQ and non-IRQ context on the same CPU?

Why don't you just use the generic spinlock based rwlock code on Tile,
since that is all that your atomic instructions can handle
sufficiently?
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