linux-kernel - why is asm-parisc/ioctl.h subtly different from asm-generic/ioctl.h?

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Message-ID: <Pine.LNX.4.64.0702240530190.11865@CPE00045a9c397f-CM001225dbafb6>
Date:	Sat, 24 Feb 2007 05:34:15 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: why is asm-parisc/ioctl.h subtly different from asm-generic/ioctl.h?

  just noticed that parisc's ioctl.h file, rather than simply
including asm-generic/ioctl.h, has its own copy whose sole
(meaningful) difference from the generic one is:

$ diff include/{asm-generic,asm-parisc}/ioctl.h
...
41,42c54,55
< #define _IOC_WRITE    1U
< #define _IOC_READ     2U
---
> #define _IOC_WRITE    2U
> #define _IOC_READ     1U

 so parisc is identical except that it switches the meaning of the
direction field?  is there a reason for this?  just curious.

rday

-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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