Hi,
back in March [1] you have recommended 53cdc1cb29e8
("drivers/base/memory.c: indicate all memory blocks as removable") to be
backported to stable trees and that has led to a more general discussion
about the current state of pfn walkers wrt. uninitialized pmem struct
pages. We haven't concluded any specific solution for that except for a
general sentiment that pfn_to_online_page should be able to catch those.
I might have missed any follow ups on that but I do not think we have
landed on any actual solution in the end. Have I just missed any followups?Is anybody working on that? Also is there any reference explaining what those struct pages are and why we cannot initialize them? I am sorry if this has been explained to me but I really cannot find that in my notes anywhere. Most pmem pages should be initialized via memmap_init_zone_device, right? I am asking mostly because we are starting to see these issues in production and while the only visible problem so far is a crash when reading sysfs (removable file) I am worried we are just lucky no other pfn walker stumble over this. [1] http://lkml.kernel.org/r/capcyv4jpdanvj67skjyujlbnbnxxqv686bivw042g03fumw...@mail.gmail.com -- Michal Hocko SUSE Labs
