linux-kernel - [PATCH v2] VERIFY_OCTAL_PERMISSIONS: Move to <linux/sysfs.h> where it belongs

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Message-ID: <20141206032310.27123.qmail@ns.horizon.com>
Date:	5 Dec 2014 22:23:10 -0500
From:	"George Spelvin" <linux@...izon.com>
To:	akpm@...ux-foundation.org, linux@...izon.com
Cc:	linux-kernel@...r.kernel.org, rdunlap@...radead.org,
	rusty@...tcorp.com.au
Subject: [PATCH v2] VERIFY_OCTAL_PERMISSIONS: Move to <linux/sysfs.h> where it belongs

It's the only user of <linux/bug.h> in kernel.h, so that reduces
the compile-time cost of #include <linux/kernel.h>

Only one user has to change: <linux/moduleparam.h>.  The <linux/types.h>
there is needed for one function prototype that passes s16 parameters.
My first reaction is to wonder if that can be gotten rid of, too.

Some other extraneous header files pruned while I was at it.
Tested with allyesconfig & allmodconfig on x86-64, just to
be sure.

Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: George Spelvin <linux@...izon.com>
---
Look, even more header pruning.

 include/linux/kernel.h      | 10 ----------
 include/linux/moduleparam.h |  4 ++--
 include/linux/sysfs.h       | 15 ++++++++++++---
 3 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 3d770f55..07080aa2 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -804,14 +804,4 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
 #endif
 
-/* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */
-#define VERIFY_OCTAL_PERMISSIONS(perms)					\
-	(BUILD_BUG_ON_ZERO((perms) < 0) +				\
-	 BUILD_BUG_ON_ZERO((perms) > 0777) +				\
-	 /* User perms >= group perms >= other perms */			\
-	 BUILD_BUG_ON_ZERO(((perms) >> 6) < (((perms) >> 3) & 7)) +	\
-	 BUILD_BUG_ON_ZERO((((perms) >> 3) & 7) < ((perms) & 7)) +	\
-	 /* Other writable?  Generally considered a bad idea. */	\
-	 BUILD_BUG_ON_ZERO((perms) & 2) +				\
-	 (perms))
 #endif
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 1c9effa2..974097df 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -1,9 +1,9 @@
 #ifndef _LINUX_MODULE_PARAMS_H
 #define _LINUX_MODULE_PARAMS_H
 /* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */
-#include <linux/init.h>
 #include <linux/stringify.h>
-#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
 
 /* You can override this manually, but generally this should match the
    module name. */
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index f97d0dbb..3562f331 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -14,12 +14,10 @@
 
 #include <linux/kernfs.h>
 #include <linux/compiler.h>
-#include <linux/errno.h>
-#include <linux/list.h>
 #include <linux/lockdep.h>
 #include <linux/kobject_ns.h>
 #include <linux/stat.h>
-#include <linux/atomic.h>
+#include <linux/bug.h>
 
 struct kobject;
 struct module;
@@ -70,6 +68,17 @@ struct attribute_group {
  * for examples..
  */
 
+/* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */
+#define VERIFY_OCTAL_PERMISSIONS(perms)					\
+	(BUILD_BUG_ON_ZERO((perms) < 0) +				\
+	 BUILD_BUG_ON_ZERO((perms) > 0777) +				\
+	 /* User perms >= group perms >= other perms */			\
+	 BUILD_BUG_ON_ZERO(((perms) >> 6) < (((perms) >> 3) & 7)) +	\
+	 BUILD_BUG_ON_ZERO((((perms) >> 3) & 7) < ((perms) & 7)) +	\
+	 /* Other writable?  Generally considered a bad idea. */	\
+	 BUILD_BUG_ON_ZERO((perms) & 2) +				\
+	 (perms))
+
 #define __ATTR(_name, _mode, _show, _store) {				\
 	.attr = {.name = __stringify(_name),				\
 		 .mode = VERIFY_OCTAL_PERMISSIONS(_mode) },		\
-- 
2.1.3
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