Re: cmpxchg in 2.5.38

From: David S. Miller (davem@redhat.com)
Date: Wed Sep 25 2002 - 02:47:19 EST


   From: Oleg Drokin <green@namesys.com>
   Date: Wed, 25 Sep 2002 11:18:20 +0400
   
   Ingo said that arches that cannot do cmpxchg in hardware should
   provide spinlock-based version.
   
That doesn't make any sense.

If cmpxchg cannot work with user bits of memory, like
cmpxchg is supposed to, it's really a crutch more than
anything else.

F.e. people will think that such systems can support DRM
correctly, they absolutely cannot.
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