On Fri, Sep 28, 2018 at 10:12:24AM +0200, Oscar Salvador wrote: > Although I am not sure about leaving memmap_init_zone unprotected. > For the normal memory, that is not a problem since the memblock's lock > protects us from touching the same pages at the same time in online/offline_pages, > but for HMM/devm the story is different. > > I am totally unaware of HMM/devm, so I am not sure if its protected somehow. > e.g: what happens if devm_memremap_pages and devm_memremap_pages_release are running > at the same time for the same memory-range (with the assumption that the hotplug-lock > does not protect move_pfn_range_to_zone anymore). I guess that this could not happen since the device is not linked to devm_memremap_pages_release until the end with: devm_add_action(dev, devm_memremap_pages_release, pgmap) -- Oscar Salvador SUSE L3
