linux-kernel - [PATCH 2/2] char/mem: Schedule /dev/port for removal

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Message-Id: <1328623901-20628-2-git-send-email-ajax@redhat.com>
Date:	Tue,  7 Feb 2012 09:11:41 -0500
From:	Adam Jackson <ajax@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	arnd@...db.de, gregkh@...uxfoundation.org
Subject: [PATCH 2/2] char/mem: Schedule /dev/port for removal

Signed-off-by: Adam Jackson <ajax@...hat.com>
---
 Documentation/feature-removal-schedule.txt |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index a0ffac0..c8504f0 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -524,3 +524,16 @@ Files:	arch/arm/mach-at91/at91cap9.c
 Why:	The code is not actively maintained and platforms are now hard to find.
 Who:	Nicolas Ferre <nicolas.ferre@...el.com>
 	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
+
+----------------------------
+
+What:	/dev/port
+When:	February 2013
+Files:	drivers/char/mem.c
+Why:	This interface does not match either ISA or PCI semantics for I/O
+	port access.  Regardless of the cycle size requested by userspace
+	/dev/port will emit byte-wide reads or writes, which is wrong
+	since devices may not allow byte access or may have side effects
+	when doing byte access to word or dword registers.  Use /dev/io
+	instead.
+Who:	Adam Jackson <ajax@...hat.com>
-- 
1.7.7.6

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