This is an RFC patchset to fix the call trace observed during memory unplug for radix guests. The problem and the fix is described in patch 2/2.
The ideal fix for this is to break the bigger radix mapping into smaller mappings during memory hot removal, but in the meanwhile I am just posting an alternate and easier solution which of course, has its own limitations (mentioned in 2/2) Changes in v1: -------------- - Move mmu-early-init-devtree() ahead of scanning memory DT nodes so that we know if the guest is radix or not when scanning memory nodes. - Make the marking of hotpluggable only if the guest is radix. v0: http://patchwork.ozlabs.org/patch/800142/ Bharata B Rao (2): powerpc: Discover radix availability before scanning the memory nodes powerpc: Fix memory unplug failure on radix guest arch/powerpc/kernel/prom.c | 6 ++++-- arch/powerpc/mm/pgtable-radix.c | 17 ++++++++++++++--- 2 files changed, 18 insertions(+), 5 deletions(-) -- 2.7.4
