From: Arnd Bergmann <arnd@arndb.de>
To: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, Oren Laadan <orenl@cs.columbia.edu>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
Pavel Emelyanov <xemul@openvz.org>, Andrew Morton <akpm@osdl.org>,
torvalds@linux-foundation.org, mikew@google.com, mingo@elte.hu,
hpa@zytor.com, Nathan Lynch <nathanl@austin.ibm.com>,
Containers <containers@lists.linux-foundation.org>,
sukadev@us.ibm.com
Subject: Re: [RFC][v6][PATCH 8/9]: Define clone_with_pids() syscall
Date: Fri, 11 Sep 2009 12:31:29 +0200 [thread overview]
Message-ID: <200909111231.30495.arnd@arndb.de> (raw)
In-Reply-To: <20090910212837.GA31459@us.ibm.com>
On Thursday 10 September 2009, Sukadev Bhattiprolu wrote:
> Since this is a variant of clone() and clone is listed as a PTREGSCALL(),
> I pass in the pt_regs.
>
> arch/x86/kernel/entry_32.S lists clone() under this comment:
>
> /*
> * System calls that need a pt_regs pointer.
> */
>
> Is there a guideline on what system calls use/need pt_regs ?
You need pt_regs if you access any registers from the user task
other than the argument registers. In case of clone(), this is
the user stack pointer.
The user_stack_pointer() function is relatively new, before this
you couldn't get the stack pointer out of pt_regs in a generic
way.
Arnd <><
next prev parent reply other threads:[~2009-09-11 10:33 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-10 6:06 [RFC][v6][PATCH 0/9] clone_with_pids() syscall Sukadev Bhattiprolu
2009-09-10 6:08 ` [RFC][v6][PATCH 1/9]: Factor out code to allocate pidmap page Sukadev Bhattiprolu
2009-09-10 6:09 ` [RFC][v6][PATCH 2/9]: Have alloc_pidmap() return actual error code Sukadev Bhattiprolu
2009-09-10 6:09 ` [RFC][v6][PATCH 3/9] Make pid_max a pid_ns property Sukadev Bhattiprolu
2009-09-10 6:09 ` [RFC][v6][PATCH 4/9]: Add target_pid parameter to alloc_pidmap() Sukadev Bhattiprolu
2009-09-10 6:10 ` [RFC][v6][PATCH 5/9]: Add target_pids parameter to alloc_pid() Sukadev Bhattiprolu
[not found] ` <20090910060627.GA24343-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-10 6:11 ` [RFC][v6][PATCH 6/9]: Add target_pids parameter to copy_process() Sukadev Bhattiprolu
2009-09-10 6:12 ` [RFC][v6][PATCH 7/9]: Define do_fork_with_pids() Sukadev Bhattiprolu
2009-09-10 6:13 ` [RFC][v6][PATCH 8/9]: Define clone_with_pids() syscall Sukadev Bhattiprolu
2009-09-10 6:14 ` [RFC][v6][PATCH 9/9]: Document " Sukadev Bhattiprolu
2009-09-10 6:11 ` [RFC][v6][PATCH 6/9]: Add target_pids parameter to copy_process() Sukadev Bhattiprolu
2009-09-10 6:12 ` [RFC][v6][PATCH 7/9]: Define do_fork_with_pids() Sukadev Bhattiprolu
2009-09-10 7:05 ` Arnd Bergmann
[not found] ` <200909100905.35817.arnd-r2nGTMty4D4@public.gmane.org>
2009-09-10 21:29 ` Sukadev Bhattiprolu
2009-09-10 21:29 ` Sukadev Bhattiprolu
[not found] ` <20090910061227.GF25883-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-10 7:05 ` Arnd Bergmann
2009-09-10 6:13 ` [RFC][v6][PATCH 8/9]: Define clone_with_pids() syscall Sukadev Bhattiprolu
[not found] ` <20090910061301.GG25883-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-10 7:31 ` Arnd Bergmann
2009-09-10 7:31 ` Arnd Bergmann
2009-09-10 21:28 ` Sukadev Bhattiprolu
[not found] ` <20090910212837.GA31459-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-11 10:31 ` Arnd Bergmann
2009-09-11 10:31 ` Arnd Bergmann [this message]
[not found] ` <200909111231.30495.arnd-r2nGTMty4D4@public.gmane.org>
2009-09-11 11:00 ` Louis Rilling
2009-09-11 11:00 ` Louis Rilling
2009-09-11 11:12 ` Arnd Bergmann
[not found] ` <20090911110056.GA12824-Hu8+6S1rdjywhHL9vcZdMVaTQe2KTcn/@public.gmane.org>
2009-09-11 11:12 ` Arnd Bergmann
[not found] ` <200909100931.25585.arnd-r2nGTMty4D4@public.gmane.org>
2009-09-10 21:28 ` Sukadev Bhattiprolu
2009-09-10 6:14 ` [RFC][v6][PATCH 9/9]: Document " Sukadev Bhattiprolu
2009-09-10 15:26 ` Randy Dunlap
2009-09-10 16:31 ` Sukadev Bhattiprolu
[not found] ` <20090910082659.033ab8fd.randy.dunlap-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2009-09-10 16:31 ` Sukadev Bhattiprolu
[not found] ` <20090910061413.GH25883-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-09-10 15:26 ` Randy Dunlap
2009-09-11 11:22 ` [RFC][v6][PATCH 0/9] " Peter Zijlstra
2009-09-11 11:34 ` Arnd Bergmann
2009-09-11 11:40 ` Peter Zijlstra
2009-09-11 11:50 ` Arnd Bergmann
2009-09-11 16:47 ` Sukadev Bhattiprolu
2009-09-11 17:00 ` Peter Zijlstra
2009-09-12 17:19 ` Sukadev Bhattiprolu
2009-09-13 14:36 ` Arnd Bergmann
2009-09-14 7:14 ` Peter Zijlstra
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