This must be done at the time of a memory removal so that no pfn_to_page(), virt_to_phys(), etc... operations can be done on the removed memory. Signed-off-by: Dave Hansen --- memhotplug-dave/mm/nonlinear.c | 33 +++++++++++++++++++++++++++++++++ 1 files changed, 33 insertions(+) diff -puN mm/nonlinear.c~G5-nonlinear-invalidation mm/nonlinear.c --- memhotplug/mm/nonlinear.c~G5-nonlinear-invalidation 2004-10-08 00:15:00.000000000 -0700 +++ memhotplug-dave/mm/nonlinear.c 2004-10-08 00:15:00.000000000 -0700 @@ -135,3 +135,36 @@ page_to_pfn(struct page *page) (page - mem_section[page_section(page)].mem_map); } + +int invalidate_phys_mapping(unsigned long pfn, unsigned long nr_pages) +{ + unsigned int section_nr = pfn_to_section(pfn); + int nr_sections = nr_pages >> (SECTION_SHIFT - PAGE_SHIFT); + unsigned long memmap_size = sizeof(struct page) * nr_pages; + unsigned int i; + + printk(KERN_DEBUG "%s(%08lx, %08lx)\n", __func__, pfn, nr_pages); + printk(KERN_DEBUG "\tsection_nr: %d\n", section_nr); + printk(KERN_DEBUG "\tnr_sections: %d\n", nr_sections); + + if (pfn_to_section(pfn) == pfn_to_section(pfn-1)) { + printk("%s() start pfn: %ld not section-aligned\n", __func__, pfn); + return -EINVAL; + } + + for (i = section_nr; i < section_nr + nr_sections; i++) { + struct mem_section *ms = &mem_section[phys_section[i]]; + struct page *mem_map_page = virt_to_page(ms->mem_map); + + ms->mem_map = NULL; + printk(KERN_DEBUG "%s(%08lx, %08lx)\n", __func__, pfn, nr_pages); + printk(KERN_DEBUG "\tphys_section[%d]: %08lx\n", i, phys_section[i]); + printk(KERN_DEBUG "\tmem_section[%d].phys_section: %08lx\n", + i, mem_section[phys_section[i]].phys_section); + phys_section[i] = INVALID_PHYS_SECTION; + ms->phys_section = INVALID_SECTION; + } + return 0; +} + + _