On Mon, 30 Jan 2012, Tejun Heo wrote: > I'm pretty sure it never gives out NULL for a dynamic allocation. The > base might be mapped to zero but we're guaranteed to have some static > percpu areas there and IIRC the percpu addresses aren't supposed to > wrap.
True but there is a check for a NULL pointer on free. So a NULL pointer currently has the semantics of being an unallocated per cpu structure. If the allocator returns NULL by accident then we cannot free the per cpu allocation anymore. _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
