Hi, I have a kernel module running within Linaro 4.4.9 with PREEMPT RT 17. Within that module I attempt to transfer data from the kernel module to user space. The user space application does not run real-time, just in plain Linux user space. With each attempted run I get a kernel dump that begins with the following: Unable to handle kernel paging request at virtual address <some address> I'm using mmap in a fairly straightforward way. Basically, upon an IOC command from the user space application to the kernel module, the kernel module attempts to copy data into the memory mapped area. I've checked, double checked, and triple checked that I'm not writing to a bad address or an address outside of the mmap'ed area. Are there some special (special in the sense of in addition to or instead of the way done for a non-PREEMPT-RT kernel) things one must do to safely write mmap'ed data within a PREEMPT RT kernel? Has anyone else encountered this problem? Thanks for any help. -Brian -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
