linux-kernel - [RFC PATCH] feature-removal: add documentation for exported symbols going away

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Message-Id: <1202941327.18204.11.camel@brick>
Date:	Wed, 13 Feb 2008 14:22:06 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH] feature-removal: add documentation for exported
	symbols going away

Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
 Documentation/feature-removal-schedule.txt         |   10 ------
 Documentation/feature-removal/exported-symbols.txt |   34 ++++++++++++++++++++
 arch/x86/kernel/io_delay.c                         |    2 +-
 net/ipv4/inet_hashtables.c                         |    2 +-
 4 files changed, 36 insertions(+), 12 deletions(-)

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 4d3aa51..b09b193 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -118,16 +118,6 @@ Who:    Adrian Bunk <bunk@...sta.de>
 
 ---------------------------
 
-What:	Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports
-	(temporary transition config option provided until then)
-	The transition config option will also be removed at the same time.
-When:	before 2.6.19
-Why:	Unused symbols are both increasing the size of the kernel binary
-	and are often a sign of "wrong API"
-Who:	Arjan van de Ven <arjan@...ux.intel.com>
-
----------------------------
-
 What:	vm_ops.nopage
 When:	Soon, provided in-kernel callers have been converted
 Why:	This interface is replaced by vm_ops.fault, but it has been around
diff --git a/Documentation/feature-removal/exported-symbols.txt b/Documentation/feature-removal/exported-symbols.txt
new file mode 100644
index 0000000..c847792
--- /dev/null
+++ b/Documentation/feature-removal/exported-symbols.txt
@@ -0,0 +1,34 @@
+The following is a list of symbols whose exports are unused in the kernel
+tree and will be removed.  Unused symbols are both increasing the size of
+the kernel binary and are often a sign of a "wrong API"
+
+When adding a symbol, change to EXPORT_UNUSED_SYMBOL{_GPL} in the source
+and schedule for removal in the first stable version the unused symbol is
+marked in + 3.  This will give out of tree code ~9 months to stop using the
+export or make a case why the export should be kept.
+
+CONFIG_UNUSED_SYMBOLS is provided to enable unused symbol exports.
+
+Please include the following:
+
+What:	the_symbol
+Where:	filename the symbol is exported from
+When:	next stable version+3
+Why:	a reason would be nice
+
+---------------------------
+
+What:	__inet_hash_connect
+Where:	net/ipv4/inet_hashtables.c
+When:	2.6.28
+Why:	No in tree users
+
+---------------------------
+
+What:	io_delay_type
+Where:	arch/x86/kernel/io_delay.c
+When:	2.6.28
+Why:	No in tree users
+
+---------------------------
+
diff --git a/arch/x86/kernel/io_delay.c b/arch/x86/kernel/io_delay.c
index bd49321..a7b8dfb 100644
--- a/arch/x86/kernel/io_delay.c
+++ b/arch/x86/kernel/io_delay.c
@@ -13,7 +13,7 @@
 #include <asm/io.h>
 
 int io_delay_type __read_mostly = CONFIG_DEFAULT_IO_DELAY_TYPE;
-EXPORT_SYMBOL_GPL(io_delay_type);
+EXPORT_UNUSED_SYMBOL_GPL(io_delay_type);
 
 static int __initdata io_delay_override;
 
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 9cac6c0..66d354f 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -494,7 +494,7 @@ out:
 		return ret;
 	}
 }
-EXPORT_SYMBOL_GPL(__inet_hash_connect);
+EXPORT_UNUSED_SYMBOL_GPL(__inet_hash_connect);
 
 /*
  * Bind a port for a connect operation and hash it.
-- 
1.5.4.1.1278.gc75be



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