Re: SYSV IPC broken for no-legacy syscall kernels (was Re: [RFC PATCH v1 26/31] ARC: Build system: Makefiles, Kconfig, Linker script)

From: Arnd Bergmann
Date: Mon Mar 11 2013 - 09:30:33 EST

On Monday 11 March 2013, James Hogan wrote:
> > /*
> > * Version flags for semctl, msgctl, and shmctl commands
> > * These are passed as bitflags or-ed with the actual command
> > */
> > #define IPC_OLD 0 /* Old version (no 32-bit UID support on many
> > architectures) */
> > #define IPC_64 0x0100 /* New version (support 32-bit UIDs, bigger
> > message sizes, etc. */
> >
> > So someone with more ABI wisdom needs to suggest what is the right approach.
> Agreed.
> Note that in uClibc, 64bit arches (excl alpha/mips for some reason) were
> already defining __IPC_64 as 0, so there's some precedent for it working
> the way it does.

Yes, there is no reason to need the distinction. If LTP is checking for
IPC_OLD compatibility on anything but really old architectures, that is
a bug in LTP, or possibly in the libc.

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