> When using OFED-1.2.5 based infiniband kernel modules on 2.6.22 based > kernels with the Ingo Molnar CONFIG_PREEMPT_RT applied, then commands > such as ibnetdiscvoer, smpquery, sminfo, etc. will hang. The problem > is with the downgrade_write() rw semaphore usage in the > ib_umad_close() routine.
Can you give a few more details on how PREEMPT_RT changes locking rules (or just exposes existing bugs maybe?) so that the downgrade_write() causes the issue? I would like to fix this cleanly but I don't really understand what the problem is. - R. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
