Messages in this thread | | | Date | Thu, 15 Mar 2018 19:35:06 +0100 | From | Michal Hocko <> | Subject | Re: [PATCH v2] Revert "mm/page_alloc: fix memmap_init_zone pageblock alignment" |
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On Thu 15-03-18 11:28:27, Linus Torvalds wrote: > On Thu, Mar 15, 2018 at 11:21 AM, Michal Hocko <mhocko@kernel.org> wrote: > > > > Well, pfn_valid says that a given pfn is backed by a real memory and it > > has a valid struct page backing it. > > No, it really just says the latter. There should be a "struct page" for it.
You are right! A simple example could be non volatile memory. That is certainly not RAM but it has pfn_valid memory. Sorry about the confusion. -- Michal Hocko SUSE Labs
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