> + nesupd->udoorbell = mmap(NULL, page_size, PROT_WRITE | PROT_READ,
> MAP_SHARED,
> + context->cmd_fd, nesupd->db_index * page_size);
> +
> + if (((void *)-1) == nesupd->udoorbell) {
probably cleaner to test against MAP_FAILED here.
> + asm __volatile__("": : :"memory");
This is insufficient on architectures with weak memory ordering; you
probably want mb() from <infiniband/arch.h>.
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