On 09/11/2014 01:46 AM, Qiaowei Ren wrote: > +static int allocate_bt(long __user *bd_entry) > +{ > + unsigned long bt_addr, old_val = 0; > + int ret = 0; > + > + bt_addr = mpx_mmap(MPX_BT_SIZE_BYTES); > + if (IS_ERR((void *)bt_addr)) > + return bt_addr; > + bt_addr = (bt_addr & MPX_BT_ADDR_MASK) | MPX_BD_ENTRY_VALID_FLAG;
Qiaowei, why do we need the "& MPX_BT_ADDR_MASK" here? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/