0fb2f83da9d1bf3fd3ea2ef817321109ea41c054
. sys_vircopy always uses D for both src and dst . sys_physcopy uses PHYS_SEG if and only if corresponding endpoint is NONE, so we can derive the mode (PHYS_SEG or D) from the endpoint arg in the kernel, dropping the seg args . fields in msg still filled in for backwards compatability, using same NONE-logic in the library
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