Memory hotplug on Power is currently broken, these two patches correct the issues needed to get memory hotplug working again.
This update marks memory resources that are added at boot time are also marked as busy. It sounds a bit counter intuitive but the core mm code will not free memory resources if they are not marked as busy. This also ensures that bootmem memory is is registered at boot time. A previous commit (46723bfa540...) that enabled memory hotplug remove with SPARSE_VMEMMAP enabled broke this on Power. Additional patches to follow to correct the current memory hotplug implementation on Power. Nathan Fontenot Updates for v2: - The WARN_ONCE is removed from the added register_page_bootmem_memmap() routine. I have been able to verify that memory hotplug works with SPARSE_VMEMMAP enabled and do not think the warning is needed. --- arch/powerpc/mm/mem.c | 9 +++++++++ linux/arch/powerpc/mm/init_64.c | 4 ++++ linux/arch/powerpc/mm/mem.c | 2 +- linux/mm/Kconfig | 2 +- 4 files changed, 15 insertions(+), 2 deletions(-) _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
