On Fri, Jan 08, 2016 at 03:08:50PM +1100, Stephen Rothwell wrote: > Hi Paul, > > On Thu, 7 Jan 2016 19:41:57 -0800 "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> wrote: > > > > Indeed, I suspect that SRCU might not be the only thing that would like > > static per-CPU variables. ;-) > > from include/linux/percpu-defs.h: > > * s390 and alpha modules require percpu variables to be defined as > * weak to force the compiler to generate GOT based external > * references for them. This is necessary because percpu sections > * will be located outside of the usually addressable area. > * > * This definition puts the following two extra restrictions when > * defining percpu variables. > * > * 1. The symbol must be globally unique, even the static ones. > * 2. Static percpu variables cannot be defined inside a function. > * > * Archs which need weak percpu definitions should define > * ARCH_NEEDS_WEAK_PER_CPU in asm/percpu.h when necessary. > * > * To ensure that the generic code observes the above two > * restrictions, if CONFIG_DEBUG_FORCE_WEAK_PER_CPU is set weak > * definition is used for all cases. > > so they can be static, but must be globally unique. Thank you for the tutorial! I have updated the patch to use a unique name for the srcu_struct added by rcuperf.c. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
