At 07/31/2012 08:22 PM, Gerald Schaefer Wrote: > On Fri, 27 Jul 2012 18:34:38 +0800 > Wen Congyang <wency@xxxxxxxxxxxxxx> wrote: > >> From: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx> >> >> All pages of virtual mapping in removed memory cannot be freed, since >> some pages used as PGD/PUD includes not only removed memory but also >> other memory. So the patch checks whether page can be freed or not. >> >> How to check whether page can be freed or not? >> 1. When removing memory, the page structs of the revmoved memory are >> filled with 0FD. >> 2. All page structs are filled with 0xFD on PT/PMD, PT/PMD can be >> cleared. In this case, the page used as PT/PMD can be freed. >> >> Applying patch, __remove_section() of CONFIG_SPARSEMEM_VMEMMAP is >> integrated into one. So __remove_section() of >> CONFIG_SPARSEMEM_VMEMMAP is deleted. > > There should also be generic or dummy versions of the functions > vmemmap_free_bootmem(), vmemmap_kfree() and > register_page_bootmem_memmap(). It doesn't compile on other > archtitectures than x86 as it is now: > > mm/built-in.o: In function `sparse_remove_one_section': > (.text+0x49fa6): undefined reference to `vmemmap_free_bootmem' > mm/built-in.o: In function `sparse_remove_one_section': > (.text+0x49fcc): undefined reference to `vmemmap_kfree' > mm/built-in.o: In function `register_page_bootmem_info_node': > (.text+0x57c06): undefined reference to `register_page_bootmem_memmap' > mm/built-in.o: In function `sparse_add_one_section': > (.meminit.text+0x2506): undefined reference to `vmemmap_kfree' > mm/built-in.o: In function `sparse_add_one_section': > (.meminit.text+0x2528): undefined reference to `vmemmap_kfree' > make: *** [vmlinux] Error 1 > > Thanks for testing. I will fix it. Wen Congyang -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
