On Mon, 2011-01-24 at 17:58 +0000, Russell King - ARM Linux wrote: > Wrong. For flatmem, we have a pfn_valid() which is backed by doing a > one, two or maybe rarely three compare search of the memblocks. Short > of having a bitmap of every page in the 4GB memory space, you can't > get more efficient than that. Sweet. So, we can just take the original patch that started this conversation, add the requisite pfn_valid()s and pfn_to_page()s, and skip the sparsemem #ifdefs. Right? -- Dave -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>