> From: Yongji Xie [mailto:xyj...@linux.vnet.ibm.com] > Sent: Tuesday, May 03, 2016 1:52 PM > > >> + > >> + if (!(res->start & ~PAGE_MASK)) { > >> + /* > >> + * Add shadow resource for sub-page bar whose mmio > >> + * page is exclusive in case that hot-add device's > >> + * bar is assigned into the mem hole. > >> + */ > >> + shadow_res = kzalloc(sizeof(*shadow_res), GFP_KERNEL); > >> + shadow_res->resource.start = res->end + 1; > >> + shadow_res->resource.end = res->start + PAGE_SIZE - 1; > > What about res->start not page aligned so you end up still having > > a portion before res->start not exclusively reserved? > > Do you mean add a 'dummy' resource to reserve the portion > before res->start if res->start not page aligned? > > But would it happen that there is a mem hole in the portion > before res->start? The resource should have been assigned > into the hole at the beginning. >
Just a quick thought. Another device might occupy that range before initializing this device, and then 'another device' is hot removed later... Thanks Kevin _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
