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Re: [PATCH] powerpc: Enable demuxed sysv IPC syscalls
- From: Arnd Bergmann <arnd at arndb dot de>
- To: libc-alpha at sourceware dot org
- Cc: Andreas Schwab <schwab at linux-m68k dot org>, "Paul E. Murphy" <murphyp at linux dot vnet dot ibm dot com>, Tulio Magno Quites Machado Filho <tuliom at linux dot vnet dot ibm dot com>
- Date: Fri, 04 Dec 2015 00:13:47 +0100
- Subject: Re: [PATCH] powerpc: Enable demuxed sysv IPC syscalls
- Authentication-results: sourceware.org; auth=none
- References: <5660A8D0 dot 5090003 at linux dot vnet dot ibm dot com> <8737vjkwqt dot fsf at igel dot home> <6988828 dot pF7m1X4889 at wuerfel>
On Friday 04 December 2015 00:09:08 Arnd Bergmann wrote:
> On Thursday 03 December 2015 23:12:10 Andreas Schwab wrote:
> > > #endif
> > > @@ -64,7 +68,12 @@ compat_symbol (libc, __old_msgctl, msgctl, GLIBC_2_0);
> > > int
> > > __new_msgctl (int msqid, int cmd, struct msqid_ds *buf)
> > > {
> > > +#ifdef __ASSUME_MSGCTL_SYSCALL
> > > + return INLINE_SYSCALL (msgctl, 3, msqid, cmd | __IPC_64, buf);
> >
> > Why does a brand new syscall need IPC_64?
>
> This is a bug in the kernel, which we should fix there. The same
> problem currently exists on ARM and AVR32, which also support the
> old IPC API (pre-__IPC64) and are adding separate syscalls now.
Correction, I looked at the wrong place: ARM and AVR32 have had this
problem for a long time, so we can't fix it any more. But we should
fix it for PowerPC and all other architectures that add these calls
in the future.
Arnd