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From: David Miller <davem@davemloft.net>
To: akpm@linux-foundation.org
Cc: airlied@linux.ie, linux-kernel@vger.kernel.org
Subject: Re: cmpxchg is not available to generic code
Date: Thu, 19 Jul 2007 00:27:16 -0700 (PDT)	[thread overview]
Message-ID: <20070719.002716.30181989.davem@davemloft.net> (raw)
In-Reply-To: <20070719000549.1e57b5b2.akpm@linux-foundation.org>

From: Andrew Morton <akpm@linux-foundation.org>
Date: Thu, 19 Jul 2007 00:05:49 -0700

> What's that code doing anyway?  driver-private locking primitives?

It's an atomic lock shared with userspace.  Whatever implementation is
used to do the lock on that object must be identical in the userspace
DRM bits.

Unlike futex, the lock operation on the user side isn't optional.
So if the platform can't do a true cmpxchg it generally cannot
support DRM.


  reply	other threads:[~2007-07-19  7:27 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-07-19  7:05 Andrew Morton
2007-07-19  7:27 ` David Miller [this message]
2007-07-19  8:15   ` Dave Airlie
2007-07-19  8:21     ` Andrew Morton
2007-07-19  8:23       ` Dave Airlie
2007-07-23  6:48         ` Nick Piggin
2007-07-19 20:54       ` David Miller
2007-07-19 20:58     ` David Miller
2007-07-19  8:02 ` Dave Airlie
2007-07-19  8:10   ` Andrew Morton
2007-07-19  8:19     ` Dave Airlie
2007-07-19  8:36       ` Andrew Morton

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