Dear Simon, > So if he config sparse memory, the issue can be solved I think. In my config file I have: CONFIG_HAVE_SPARSE_IRQ=y CONFIG_SPARSE_IRQ=y CONFIG_ARCH_SPARSEMEM_ENABLE=y # CONFIG_SPARSEMEM_MANUAL is not set CONFIG_SPARSEMEM_STATIC=y # CONFIG_INPUT_SPARSEKMAP is not set # CONFIG_SPARSE_RCU_POINTER is not set Is that sufficient for sparse memory, or should I try something else? Or maybe, you meant that some kernel source patches might be possible in the sparse memory code? Thanks, Paul Paul Szabo psz@xxxxxxxxxxxxxxxxx http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>