Messages in this thread | | | Date | Fri, 28 Sep 2018 10:44:33 +0200 | From | Oscar Salvador <> | Subject | Re: [PATCH v5 4/4] mm: Defer ZONE_DEVICE page initialization to the point where we init pgmap |
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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
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