Hi All, This series is to address the problem with RCU synchronization occurring, possibly relatively often, inside of acpi_ex_system_memory_space_handler(), when the namespace and interpreter mutexes are held. Like I said before, I had decided to change the approach used in the previous iteration of this series and to allow the unmap operations carried out by acpi_ex_system_memory_space_handler() to be deferred in the first place, which is done in patches [1-2/4]. However, it turns out that the "fast-path" mapping is still useful on top of the above to reduce the number of ioremap-iounmap cycles for the same address range and so it is introduced by patches [3-4/4]. For details, please refer to the patch changelogs. The series is available from the git branch at git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git \ acpica-osl for easier testing. Cheers, Rafael
