From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Subject: Re: [RFC][v8][PATCH 0/10] Implement clone3() system call
Date: Tue, 13 Oct 2009 21:38:58 -0700
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To: Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Cc: randy.dunlap-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, Containers <containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>, Nathan Lynch <nathanl-V7BBcbaFuwjMbYB6QlFGEg@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Louis.Rilling-aw0BnHfMbSpBDgjK7y7TUQ@public.gmane.org, "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>, kosaki.motohiro-+CUm20s59erQFUHtdCDX3A@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, mingo-X9Un+BFzKDI@public.gmane.org, torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, Alexey Dobriyan <adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Roland McGrath <roland-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Pavel Emelyanov <xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
List-Id: linux-api@vger.kernel.org

On 10/13/2009 09:36 PM, Sukadev Bhattiprolu wrote:
> 
> Would it help to use a type clone_flags_64_t to make the distinction
> between types more explicit ?
> 

The problem with using the same flags in two places, one as a 32-bit and
one as a 64-bit number, is that using one in the wrong place will cause
silent, but deadly, truncation.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.