On Tue, Nov 17, 2020 at 3:25 PM Valdis Klētnieks <valdis.kletnieks@xxxxxx> wrote: > > > > > > dc ivac,x1 // invalidate a cache line that's probably OK > > > > > str w0,[x1 // and now we do a store that leaves a possibly stale cache line > > > Could you explain me why the store still leaves stale cache? > > We invalidated the cacheline and store will not make footprint in the cache. > > There's a race condition... > > Invalidate the cache line.... then another CPU manages to fetch the cache line. > and then we do a store that doesn't update the cache - and the other CPU > is still looking at the old data. Oh, I didn't consider that another cpu read with cacheable. Now I understand why the barrier is here. Thank you for your help. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
