From: "Andrea Arcangeli" <andrea@suse.de>
To: "Chris Wing" <wingc@engin.umich.edu>
Cc: <linux-kernel@vger.rutgers.edu>
Sent: Thursday, January 06, 2000 12:53 PM
Subject: Re: [PATCH] 32-bit UID support for 2.3.36
> On Thu, 6 Jan 2000, Chris Wing wrote:
>
> > linux-ipc.patch
> >
> > Support for 32-bit UIDs in SysVipc: message queues,
> > semaphores, and shared memory.
> > Also fixes the ABI breakage on Alpha.
>
> Your fix is not necessary. In 2.3.36 alpha uses a particular shmctl
> syscall. If somebody need more than 32bit for specifying the size he
> should simply use the new syscall (that recalls the raw ipc/shm.c code).
> So you don't need to touch this issue anymore in your patches. Left it a
> size_t.
Yes, but your patch adds a third binary structure for shmid_ds:
* before 2.3.1x: int shm_segsz, short pid
* 2.3.36: size_t shm_segsz, short pid
* Chris' patch: size_t shm_segsz, int pid
If Chris' patch gets into 2.4, then "size_t shm_segsz, short pid" is
superflous, and I would prefer if we could drop it before 2.4. If we support
it in 2.4 then we won't be able to drop it during the next 10 years.
--
Manfred
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