Re: IGMP and rwlock: Dead ocurred again on TILEPro
From: David Miller <davem@davemloft.net>
Date: 2011-02-17 22:52:58
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From: Chris Metcalf <redacted> 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?