Hi, in debian linux sparc in /usr/include/asm-sparc/atomic.h this line prevents being used: #ifdef __KERNEL__ No such line exists in asm-sparc64/atomic.h >From google search i see this discussed a couple of years ago in different conteaxts, kernel headers should not be used by users, but this is not a kernel header? I would appreciate some comment, i could file a bug, but is this is a bug? thanks jim