Re: [PATCH v3 3/3] generic sys_ipc wrapper

From: David Howells
Date: Thu Jan 14 2010 - 10:28:14 EST

Christoph Hellwig <hch@xxxxxx> wrote:

> From: Christoph Hellwig <hch@xxxxxx>
> Subject: generic sys_ipc wrapper
> Add a generic implementation of the ipc demultiplexer syscall. Except for
> s390 and sparc64 all implementations of the sys_ipc are nearly identical.
> There are slight differences in the types of the parameters, where mips
> and powerpc as the only 64-bit architectures with sys_ipc use unsigned long
> for the "third" argument as it gets casted to a pointer later, while it
> traditionally is an "int" like most other paramters. frv goes even further
> and uses unsigned long for all parameters execept for "ptr" which is a pointer
> type everywhere. The change from int to unsigned long for "third" and back
> to "int" for the others on frv should be fine due to the in-register calling
> conventions for syscalls (we already had a similar issue with the generic
> sys_ptrace), but I'd prefer to have the arch maintainers looks over this
> in details.
> Except for that h8300, m68k and m68knommu lack an impplementation of the
> semtimedop sub call which this patch adds, and various architectures have
> different strategies for the SHMAT version 1 case which apparently never
> gets used - at least on i386 it seems superflous as the compat code on
> x86-64 and ia64 doesn't even bother to implement it.
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Acked-by: David Howells <dhowells@xxxxxxxxxx> [for FRV & MN10300]
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