On Tue, Sep 13, 2016 at 05:26:05PM +0800, Rui Teng wrote: > The huge page size could be 16G(0x400000000) on ppc64 architecture, and it will > cause an overflow on unsigned long data type(0xFFFFFFFF). Huh? ppc64 is 64-bit system and sizeof(void *) is equal to sizeof(unsigned long) on Linux (LP64 model). So where your 0xFFFFFFFF comes from? -- Kirill A. Shutemov -- 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>