On Wed, 16 Jul 2014, Pranith Kumar wrote: > +You can also do the following to convert the datap offset to an address > + > + struct data *p = this_cpu_ptr(&datap); > + > +but, passing of pointers calculated via this_cpu_ptr to other cpus is > +unusual and should be avoided. > + > +Such remote accesses to per CPU data are not guaranteed to be atomic > +anymore. You will have to use atomic_t and rely on the standard atomic > +operations for these remote accesses to be atomic.
The use of atomic_t implies a remote write operation to a percpu area. atomic_t needs to be avoided. If data needs to be modified from multiple cpus then it usually does not belong into a percpu area. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
