From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Cc: Arjan van de Ven <arjan-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Roland McGrath <roland-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Sukadev Bhattiprolu
<sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Arnd Bergmann <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,
"Eric W. Biederman"
<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>,
mingo-X9Un+BFzKDI@public.gmane.org,
Alexey Dobriyan
<adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Pavel Emelyanov <xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
kosaki.motohiro-+CUm20s59erQFUHtdCDX3A@public.gmane.org
Subject: Re: [RFC][v7][PATCH 8/9]: Define clone2() syscall
Date: Tue, 29 Sep 2009 15:19:30 -0700 [thread overview]
Message-ID: <4AC287F2.8060603@zytor.com> (raw)
In-Reply-To: <alpine.LFD.2.01.0909291501530.6996-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
On 09/29/2009 03:11 PM, Linus Torvalds wrote:
>
> Ok, I agree with that. The kernel side is easy (we have magic calling
> conventions there and need to turn registers into arguments anyway before
> you get to the shared code), but your point about the user side prototype
> is valid.
>
I think it would also apply to kernel-side munging. It's quite possibly
you're right in that clone is such a special case anyway, but it seems
pointless to make it more special in the short bus sort of way even if
it is possible.
Let's just make it another system call. It doesn't have any downside
that I can see, might prevent problems, and avoids setting a bad
precedent that someone can misinterpret.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Arjan van de Ven <arjan@infradead.org>,
Roland McGrath <roland@redhat.com>,
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
Arnd Bergmann <arnd@arndb.de>,
Containers <containers@lists.linux-foundation.org>,
Nathan Lynch <nathanl@austin.ibm.com>,
linux-kernel@vger.kernel.org,
"Eric W. Biederman" <ebiederm@xmission.com>,
mingo@elte.hu, Alexey Dobriyan <adobriyan@gmail.com>,
Pavel Emelyanov <xemul@openvz.org>,
linux-api@vger.kernel.org, kosaki.motohiro@jp.fujitsu.com
Subject: Re: [RFC][v7][PATCH 8/9]: Define clone2() syscall
Date: Tue, 29 Sep 2009 15:19:30 -0700 [thread overview]
Message-ID: <4AC287F2.8060603@zytor.com> (raw)
In-Reply-To: <alpine.LFD.2.01.0909291501530.6996@localhost.localdomain>
On 09/29/2009 03:11 PM, Linus Torvalds wrote:
>
> Ok, I agree with that. The kernel side is easy (we have magic calling
> conventions there and need to turn registers into arguments anyway before
> you get to the shared code), but your point about the user side prototype
> is valid.
>
I think it would also apply to kernel-side munging. It's quite possibly
you're right in that clone is such a special case anyway, but it seems
pointless to make it more special in the short bus sort of way even if
it is possible.
Let's just make it another system call. It doesn't have any downside
that I can see, might prevent problems, and avoids setting a bad
precedent that someone can misinterpret.
-hpa
next prev parent reply other threads:[~2009-09-29 22:19 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-24 16:55 [RFC][v7][PATCH 0/9] Implement clone2() system call Sukadev Bhattiprolu
2009-09-24 17:00 ` [RFC][v7][PATCH 1/9]: Factor out code to allocate pidmap page Sukadev Bhattiprolu
2009-09-24 17:00 ` [RFC][v7][PATCH 2/9]: Have alloc_pidmap() return actual error code Sukadev Bhattiprolu
2009-09-24 17:01 ` [RFC][v7][PATCH 3/9] Make pid_max a pid_ns property Sukadev Bhattiprolu
[not found] ` <20090924170109.GC16989-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-24 17:45 ` Oren Laadan
2009-09-24 17:45 ` Oren Laadan
2009-09-24 17:01 ` [RFC][v7][PATCH 4/9]: Add target_pid parameter to alloc_pidmap() Sukadev Bhattiprolu
[not found] ` <20090924170131.GD16989-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-24 17:47 ` Oren Laadan
2009-09-24 17:47 ` Oren Laadan
[not found] ` <20090924165548.GA16586-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-24 17:00 ` [RFC][v7][PATCH 1/9]: Factor out code to allocate pidmap page Sukadev Bhattiprolu
2009-09-24 17:00 ` [RFC][v7][PATCH 2/9]: Have alloc_pidmap() return actual error code Sukadev Bhattiprolu
2009-09-24 17:01 ` [RFC][v7][PATCH 3/9] Make pid_max a pid_ns property Sukadev Bhattiprolu
2009-09-24 17:01 ` [RFC][v7][PATCH 4/9]: Add target_pid parameter to alloc_pidmap() Sukadev Bhattiprolu
2009-09-24 17:01 ` [RFC][v7][PATCH 5/9]: Add target_pids parameter to alloc_pid() Sukadev Bhattiprolu
2009-09-24 17:02 ` [RFC][v7][PATCH 6/9]: Add target_pids parameter to copy_process() Sukadev Bhattiprolu
2009-09-24 17:02 ` [RFC][v7][PATCH 7/9]: Define do_fork_with_pids() Sukadev Bhattiprolu
2009-09-24 17:03 ` [RFC][v7][PATCH 8/9]: Define clone2() syscall Sukadev Bhattiprolu
2009-09-24 17:03 ` [RFC][v7][PATCH 9/9]: Document " Sukadev Bhattiprolu
2009-09-24 17:44 ` [RFC][v7][PATCH 0/9] Implement clone2() system call Oren Laadan
2009-09-24 17:57 ` Alexey Dobriyan
2009-09-24 17:01 ` [RFC][v7][PATCH 5/9]: Add target_pids parameter to alloc_pid() Sukadev Bhattiprolu
2009-09-24 17:02 ` [RFC][v7][PATCH 6/9]: Add target_pids parameter to copy_process() Sukadev Bhattiprolu
2009-09-24 17:02 ` [RFC][v7][PATCH 7/9]: Define do_fork_with_pids() Sukadev Bhattiprolu
2009-09-24 17:03 ` [RFC][v7][PATCH 8/9]: Define clone2() syscall Sukadev Bhattiprolu
2009-09-24 21:43 ` Arnd Bergmann
[not found] ` <200909242343.59903.arnd-r2nGTMty4D4@public.gmane.org>
2009-09-25 8:23 ` Louis Rilling
2009-09-25 8:23 ` Louis Rilling
2009-09-25 10:56 ` Louis Rilling
[not found] ` <20090925105632.GG12824-Hu8+6S1rdjywhHL9vcZdMVaTQe2KTcn/@public.gmane.org>
2009-09-29 18:05 ` Sukadev Bhattiprolu
2009-09-29 18:05 ` Sukadev Bhattiprolu
2009-09-29 18:05 ` Sukadev Bhattiprolu
[not found] ` <20090929180537.GD4625-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-29 18:40 ` Roland McGrath
2009-09-29 18:40 ` Roland McGrath
2009-09-29 18:40 ` Roland McGrath
[not found] ` <20090929184023.532DF34-nL1rrgvulkc2UH6IwYuUx0EOCMrvLtNR@public.gmane.org>
2009-09-29 18:44 ` H. Peter Anvin
2009-09-29 18:44 ` H. Peter Anvin
2009-09-29 18:44 ` H. Peter Anvin
[not found] ` <4AC255A4.4030002-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2009-09-29 19:02 ` Arjan van de Ven
2009-09-29 19:02 ` Arjan van de Ven
[not found] ` <20090929210207.247b94df-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2009-09-29 19:10 ` Linus Torvalds
2009-09-29 19:10 ` Linus Torvalds
[not found] ` <alpine.LFD.2.01.0909291207410.6996-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2009-09-29 20:02 ` H. Peter Anvin
2009-09-29 20:02 ` H. Peter Anvin
[not found] ` <4AC267C7.4070300-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2009-09-29 22:11 ` Linus Torvalds
2009-09-29 22:11 ` Linus Torvalds
[not found] ` <alpine.LFD.2.01.0909291501530.6996-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2009-09-29 22:19 ` H. Peter Anvin [this message]
2009-09-29 22:19 ` H. Peter Anvin
[not found] ` <4AC287F2.8060603-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2009-09-30 16:15 ` Arnd Bergmann
2009-09-30 16:15 ` Arnd Bergmann
[not found] ` <200909301815.45211.arnd-r2nGTMty4D4@public.gmane.org>
2009-09-30 16:27 ` Linus Torvalds
2009-09-30 16:27 ` Linus Torvalds
[not found] ` <alpine.LFD.2.01.0909300925170.6996-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2009-09-30 17:59 ` Arnd Bergmann
2009-09-30 17:59 ` Arnd Bergmann
[not found] ` <200909301959.41706.arnd-r2nGTMty4D4@public.gmane.org>
2009-09-30 19:14 ` Linus Torvalds
2009-09-30 19:14 ` Linus Torvalds
2009-09-30 19:14 ` Linus Torvalds
2009-09-30 16:15 ` Arnd Bergmann
2009-09-29 22:19 ` H. Peter Anvin
2009-09-30 6:48 ` Roland McGrath
2009-09-30 6:48 ` Roland McGrath
2009-09-30 6:48 ` Roland McGrath
2009-09-29 20:02 ` H. Peter Anvin
2009-09-29 19:10 ` Linus Torvalds
2009-09-29 20:00 ` H. Peter Anvin
2009-09-29 20:00 ` H. Peter Anvin
2009-09-29 21:58 ` Oren Laadan
2009-09-29 21:58 ` Oren Laadan
2009-09-29 21:58 ` Oren Laadan
2009-09-25 10:56 ` Louis Rilling
[not found] ` <20090924170308.GH16989-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-24 21:43 ` Arnd Bergmann
2009-09-24 17:03 ` [RFC][v7][PATCH 9/9]: Document " Sukadev Bhattiprolu
2009-09-24 18:05 ` Randy Dunlap
[not found] ` <20090924170331.GI16989-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-24 18:05 ` Randy Dunlap
2009-09-25 2:31 ` KOSAKI Motohiro
2009-09-25 2:31 ` KOSAKI Motohiro
2009-09-24 17:44 ` [RFC][v7][PATCH 0/9] Implement clone2() system call Oren Laadan
2009-09-24 20:15 ` Sukadev Bhattiprolu
2009-09-24 22:06 ` Oren Laadan
[not found] ` <4ABBED72.9080901-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>
2009-09-24 22:21 ` Arnd Bergmann
2009-09-24 22:21 ` Arnd Bergmann
2009-09-24 23:19 ` Oren Laadan
[not found] ` <200909250021.03535.arnd-r2nGTMty4D4@public.gmane.org>
2009-09-24 23:19 ` Oren Laadan
[not found] ` <20090924201517.GA24786-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-24 22:06 ` Oren Laadan
2009-10-01 2:36 ` Sukadev Bhattiprolu
2009-10-01 15:19 ` Oren Laadan
[not found] ` <20091001023618.GA31344-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-10-01 15:19 ` Oren Laadan
[not found] ` <4ABBAFE5.2000704-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>
2009-09-24 20:15 ` Sukadev Bhattiprolu
2009-10-01 2:36 ` Sukadev Bhattiprolu
2009-09-24 17:57 ` Alexey Dobriyan
2009-09-24 18:35 ` Serge E. Hallyn
2009-09-24 18:35 ` Serge E. Hallyn
[not found] ` <20090924183556.GA31356-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-30 5:34 ` Alexey Dobriyan
2009-09-30 5:34 ` Alexey Dobriyan
2009-09-30 17:41 ` Oren Laadan
2009-10-02 20:27 ` Alexey Dobriyan
2009-10-02 21:06 ` Oren Laadan
2009-10-02 21:06 ` Oren Laadan
[not found] ` <4AC39859.3090703-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>
2009-10-02 20:27 ` Alexey Dobriyan
2009-09-30 17:41 ` Oren Laadan
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