linux-kernel - Re: [PATCH] x86: Wire up 32-bit direct socket calls

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Message-ID: <20150914133500.GA385@gmail.com>
Date:	Mon, 14 Sep 2015 15:35:00 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
	Network Development <netdev@...r.kernel.org>,
	Tulio Magno Quites Machado Filho 
	<tuliom@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexander Larsson <alexl@...hat.com>,
	Cosimo Cecchi <cosimo@...lessm.com>,
	Dan Nicholson <nicholson@...lessm.com>,
	libc-alpha <libc-alpha@...rceware.org>,
	Rajalakshmi Srinivasaraghavan <raji@...ux.vnet.ibm.com>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] x86: Wire up 32-bit direct socket calls


* Andy Lutomirski <luto@...capital.net> wrote:

> On Fri, Sep 11, 2015 at 3:14 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Friday 11 September 2015 11:54:50 Geert Uytterhoeven wrote:
> >> To make sure I don't miss any (it seems I missed recvmmsg and sendmmsg for
> >> the socketcall case, sigh), this is the list of ipc syscalls to implement?
> >>
> >>     sys_msgget
> >>     sys_msgctl
> >>     sys_msgrcv
> >>     sys_msgsnd
> >>     sys_semget
> >>     sys_semctl
> >>     sys_semtimedop
> >>     sys_shmget
> >>     sys_shmctl
> >>     sys_shmat
> >>     sys_shmdt
> >>
> >> sys_semop() seems to be unneeded because it can be implemented using
> >> sys_semtimedop()?
> >>
> >
> > Yes, that list looks right. IPC also includes a set of six sys_mq_*
> > call, but I believe that everyone already has those as they are not
> > covered by sys_ipc.
> >
> > For y2038 compatibility, we will likely add a new variant of
> > semtimedop that takes a 64-bit timespec. While the argument passed
> > there is a relative time that will never need to be longer than 68
> > years, we need to accommodate user space that defines timespec
> > in a sane way, and converting the argument in libc would be awkward.
> >
> 
> I missed sys_ipc entirely.
> 
> Ingo, Thomas, want to just wire those up, too?  I can send a patch
> next week, but it'll be as trivial as the socket one.

Yeah, sure - split out system calls are so much better (and slightly faster) than 
omnibus demuxers.

Thanks,

	Ingo
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