Hello, On Tue, May 12, 2015 at 08:32:33PM +0800, Lai Jiangshan wrote: > When apply_wqattrs_prepare() is called, it is possible that the default > pwq is unaffected. It is always true that only the NUMA affinity is being > changed and sometimes true that the low level cpumask is being changed. > > So we try to reuse the current default pwq when its attrs unchanged. > > After this change, "ctx->dfl_pwq->refcnt++" could be dangerous > when ctx->dfl_pwq is being reused, so we use get_pwq_unlocked() instead.
Can you elaborate the above paragraph? Why wouldn't that be dangerous before this change? Thanks. -- tejun -- 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/
