Zou, Nanhai wrote: > Hi, > This patch should fix the issue. > This patch affects the semantics of the generic code. To change it would mean changing all the other architectures to use the new semantics. add_active_ranges(nid, start, end) is defined to add the range below to node nid: start <= pfn < end The change in this patch makes it: start <= pfn <= end This will incorrectly add pages to regions registered by all other architectures. This implies one of two things: 1) the EFI map is actually defining regions start <= pfn <= end, and these should be registered as add_active_region(nid, start, end + 1), or 2) the kexec EFI map is being incorrectly filled in using start <= pfn <= end form. Looking at (1), it seems that the EFI map actually defines the region using (start, num_pages) tuples. These are converted in walk() to (start, end) where end = start + num_pages. This implies to me that the callback is recieving (start, end) where the valid region is start <= pfn < end, which is compatible with the add_active_region implementation. A quick look at the contig and discontig implementations they preserve this through. >>> Index: linux-2.6/arch/ia64/mm/discontig.c >>> =================================================================== >>> --- linux-2.6.orig/arch/ia64/mm/discontig.c 2006-11-02 >> 16:17:59.000000000 +0900 >>> +++ linux-2.6/arch/ia64/mm/discontig.c 2006-11-02 16:18:03.000000000 >> +0900 >>> @@ -689,6 +689,8 @@ >>> arch_sparse_init(); >>> >>> efi_memmap_walk(filter_rsvd_memory, count_node_pages); >>> + add_active_range(0, ia64_tpa(_text) >> PAGE_SHIFT, >>> + (ia64_tpa(_end) -1 ) >> PAGE_SHIFT); Ok, this is wrong in the sense that you should be adjusting the end up to the page following the end of the region. You are rounding the end down making it start <= pfn <= end. It should be something like this: add_active_range(0, ia64_tpa(_text) >> PAGE_SHIFT, (ia64_tpa(_end) + PAGE_SIZE - 1) >> PAGE_SHIFT); Does this change on its own fix things? >>> >>> #ifdef CONFIG_VIRTUAL_MEM_MAP >>> vmalloc_end -= PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * -apw - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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