On 01/27/2014 09:53 AM, H. Peter Anvin wrote:
On 01/26/2014 05:34 PM, Ren Qiaowei wrote:I agree with you and we should suppress all the warnings as possible. If I use (unsgined long) to cast like the following code, what do you think about it? sizeof(long) will be 4 for 32-bit. info->si_lower = (void __user *)(unsigned long) (xsave_buf->bndregs.bndregs[2*bndregno]); info->si_upper = (void __user *)(unsigned long) (~xsave_buf->bndregs.bndregs[2*bndregno+1]);That is the way it is usually done, yes. Add a comment saying something like: /* Note: the upper 32 bits are ignored in 32-bit mode. */ It is worth watching out a bit here, though, because you could be running a 32-bit process on top of a 64-bit kernel.
Ok. I will update it in next version. Thanks, Qiaowei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
