linux-kernel - Filename case conflict Documentation/io-mapping.txt and Documentation/IO-mapping.txt

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Date:	Wed, 30 Jun 2010 22:58:21 +0200
From:	Kees Bakker <kees.bakker@...all.nl>
To:	linux-kernel@...r.kernel.org
Cc:	Keith Packard <keithp@...thp.com>
Subject: Filename case conflict Documentation/io-mapping.txt and Documentation/IO-mapping.txt

Hi,

Do we really want these two filenames as they are right now?
We have:
   Documentation/IO-mapping.txt
   Documentation/io-mapping.txt

kees@...nkie:~/src/linux-2.6$ git blame Documentation/IO-mapping.txt|head
^1da177e (Linus Torvalds    2005-04-16 15:20:36 -0700   1) [ NOTE: The virt_to_bus() and bus_to_virt() functions have been
5872fb94 (Randy Dunlap      2009-01-29 16:28:02 -0800   2) 	superseded by the functionality provided by the PCI DMA interface
5872fb94 (Randy Dunlap      2009-01-29 16:28:02 -0800   3) 	(see Documentation/PCI/PCI-DMA-mapping.txt).  They continue
^1da177e (Linus Torvalds    2005-04-16 15:20:36 -0700   4) 	to be documented below for historical purposes, but new code
^1da177e (Linus Torvalds    2005-04-16 15:20:36 -0700   5) 	must not use them. --davidm 00/12/12 ]
^1da177e (Linus Torvalds    2005-04-16 15:20:36 -0700   6) 
^1da177e (Linus Torvalds    2005-04-16 15:20:36 -0700   7) [ This is a mail message in response to a query on IO mapping, thus the
^1da177e (Linus Torvalds    2005-04-16 15:20:36 -0700   8)   strange format for a "document" ]
^1da177e (Linus Torvalds    2005-04-16 15:20:36 -0700   9) 
^1da177e (Linus Torvalds    2005-04-16 15:20:36 -0700  10) The AHA-1542 is a bus-master device, and your patch makes the driver give the

kees@...nkie:~/src/linux-2.6$ git blame Documentation/io-mapping.txt|head
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  1) The io_mapping functions in linux/io-mapping.h provide an abstraction for
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  2) efficiently mapping small regions of an I/O device to the CPU. The initial
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  3) usage is to support the large graphics aperture on 32-bit processors where
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  4) ioremap_wc cannot be used to statically map the entire aperture to the CPU
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  5) as it would consume too much of the kernel address space.
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  6) 
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  7) A mapping object is created during driver initialization using
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  8) 
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700  9) 	struct io_mapping *io_mapping_create_wc(unsigned long base,
9663f2e6 (Keith Packard 2008-10-30 19:38:18 -0700 10) 						unsigned long size)

So the IO-mapping.txt was there first. Keith, can't we rename your
file? For example,

   Documentation/io-mapping.txt => Documentation/io-mapping.h.txt
-- 
Kees

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