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d9f4623307
that the 'data' pointer is already setup to point to a valid KVM buffer or contains the copied-in data from userland as appropriate (ioctl(2) still does this). kern_ioctl() takes care of looking up a file pointer, implementing FIONCLEX and FIOCLEX, and calling fi_ioctl(). - Use kern_ioctl() to implement xenix_rdchk() instead of using the stackgap and mark xenix_rdchk() MPSAFE.