On Thu, Jul 20, 2023 at 8:54 PM Alan Huang <mmpgouride@xxxxxxxxx> wrote: > > Hi, > > I noticed a commit c87a124a5d5e(“net: force a reload of first item in hlist_nulls_for_each_entry_rcu”) > and a related discussion [1]. > > After reading the whole discussion, it seems like that ptr->field was cached by gcc even with the deprecated > ACCESS_ONCE(), so my question is: > > Is that a compiler bug? If so, has this bug been fixed today, ten years later? > > What about READ_ONCE(ptr->field)? Make sure sparse is happy. Do you have a patch for review ? > > > [1] https://lore.kernel.org/all/1369699930.3301.494.camel@edumazet-glaptop/ > > Thanks, > Alan
