On Fri, Jul 17, 2015 at 10:49:19AM +0000, Ben Maurer wrote: > Mathieu Desnoyers wrote: > > Expose a new system call allowing threads to register a userspace memory > > area where to store the current CPU number. Scheduler migration sets the > > I really like that this approach makes it easier to add a per-thread > interaction between userspace and the kernel in the future. > > >+ if (!tlap || t->thread_local_abi_len < > >+ offsetof(struct thread_local_abi, cpu) > >+ + sizeof(tlap->cpu)) > > Could you save a branch here by enforcing that thread_local_abi_len = 0 if > thread_local_abi = null?
"saving a branch" doesn't seem like a good reason to do that; however, it *is* the convention across other calls: if you pass 0, the pointer is ignored, but if you pass non-zero, the pointer must be valid or you get -EFAULT (or an actual segfault). - Josh Triplett -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
