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SubjectRE: [ RESEND PATCH v3] Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel

3 points...
1. I think this patch cannot be compiled in archs other than x86. Right ?
IOW, please add static inline dummy...
[Zheng, Shaohui] Agree, I will add a static dummy function

2. pgdat->[start,end], totalram_pages etc...are updated at memory hotplug.
Please place the hook nearby them.
[Zheng, Shaohui] Agree.

3. I recommend you yo use memory hotplug notifier.
If it's allowed, it will be cleaner.
It seems there are no strict ordering to update parameters this patch touches.

[Zheng, Shaohui] Kame, do you means put the hook into function slab_mem_going_online_callback, it seems a good idea. If we select this method, we will need not to update these variable in function add_memory explicitly.

Thanks,
-Kame





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