linux-kernel - [PATCH 46/62] sysfs: Document sysfs_attr_init and sysfs_bin_attr

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Message-Id: <1267572541-410-46-git-send-email-gregkh@suse.de>
Date:	Tue,  2 Mar 2010 15:28:45 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 46/62] sysfs: Document sysfs_attr_init and sysfs_bin_attr_init

From: Eric W. Biederman <ebiederm@...ssion.com>

I have added a new requirement to the external sysfs interface
that dynamically allocated sysfs attributes must call sysfs_attr_init
if lockdep is enabled.  For the time being callying sysfs_attr_init
is only mandatory if lockdep is enabled, so we can live with a few
unconverted instances until we find them all.  As this is part of
the public interface of sysfs it is a good idea to document these
pseudo functions so someone inspeciting the code can find out
what has happened.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 include/linux/sysfs.h |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 006c359..5b8f80f 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -36,6 +36,16 @@ struct attribute {
 #endif
 };
 
+/**
+ *	sysfs_attr_init - initialize a dynamically allocated sysfs attribute
+ *	@attr: struct attribute to initialize
+ *
+ *	Initialize a dynamically allocated struct attribute so we can
+ *	make lockdep happy.  This is a new requirement for attributes
+ *	and initially this is only needed when lockdep is enabled.
+ *	Lockdep gives a nice error when your attribute is added to
+ *	sysfs if you don't have this.
+ */
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 #define sysfs_attr_init(attr)				\
 do {							\
@@ -90,6 +100,16 @@ struct bin_attribute {
 		    struct vm_area_struct *vma);
 };
 
+/**
+ *	sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
+ *	@attr: struct bin_attribute to initialize
+ *
+ *	Initialize a dynamically allocated struct bin_attribute so we
+ *	can make lockdep happy.  This is a new requirement for
+ *	attributes and initially this is only needed when lockdep is
+ *	enabled.  Lockdep gives a nice error when your attribute is
+ *	added to sysfs if you don't have this.
+ */
 #define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&bin_attr->attr)
 
 struct sysfs_ops {
-- 
1.7.0.1

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