On Tue, Sep 18, 2007 at 05:12:48PM -0700, David Daney wrote: > I guess my basic question is: Should MIPS_COMPARE_AND_SWAP have a 'sync' > after > the 'sc'? I would have thought that 'sc' made the write visible to all CPUs, > but on the SB1 it appears not to be the case.
Yes, a barrier of some sort is definitely necessary. I believe the SB1 is weakly ordered, and the architecture spec permits both strong and weak ordering; but it's been a while since I tried this. -- Daniel Jacobowitz CodeSourcery
