linux-kernel - [PATCH v1 1/1] kernel.h: Move upper_*_bits() and lower_*

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Date: Wed, 14 Feb 2024 19:26:32 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
	Michal Wajdeczko <michal.wajdeczko@...el.com>
Subject: [PATCH v1 1/1] kernel.h: Move upper_*_bits() and lower_*_bits() to wordpath.h

The wordpart.h header is collecting APIs related to the handling
parts of the word (usually in byte granularity). The upper_*_bits()
and lower_*_bits() are good candidates to be moved to there.

This helps to clean up header dependency hell with regard to kernel.h
as the latter gathers completely unrelated stuff together and slows
down compilation (especially when it's included into other header).

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---

Kees, since wordpart.h is now only in your tree, this is supposed
to go there as well.

 include/linux/kernel.h   | 30 ++----------------------------
 include/linux/wordpart.h | 29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 28 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 5f74733391ed..d718fbec72dd 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -33,6 +33,8 @@
 #include <linux/sprintf.h>
 #include <linux/static_call_types.h>
 #include <linux/instruction_pointer.h>
+#include <linux/wordpart.h>
+
 #include <asm/byteorder.h>
 
 #include <uapi/linux/kernel.h>
@@ -52,34 +54,6 @@
 }					\
 )
 
-/**
- * upper_32_bits - return bits 32-63 of a number
- * @n: the number we're accessing
- *
- * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
- * the "right shift count >= width of type" warning when that quantity is
- * 32-bits.
- */
-#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
-
-/**
- * lower_32_bits - return bits 0-31 of a number
- * @n: the number we're accessing
- */
-#define lower_32_bits(n) ((u32)((n) & 0xffffffff))
-
-/**
- * upper_16_bits - return bits 16-31 of a number
- * @n: the number we're accessing
- */
-#define upper_16_bits(n) ((u16)((n) >> 16))
-
-/**
- * lower_16_bits - return bits 0-15 of a number
- * @n: the number we're accessing
- */
-#define lower_16_bits(n) ((u16)((n) & 0xffff))
-
 struct completion;
 struct user;
 
diff --git a/include/linux/wordpart.h b/include/linux/wordpart.h
index c9e6bd773ebd..f6f8f83b15b0 100644
--- a/include/linux/wordpart.h
+++ b/include/linux/wordpart.h
@@ -2,6 +2,35 @@
 
 #ifndef _LINUX_WORDPART_H
 #define _LINUX_WORDPART_H
+
+/**
+ * upper_32_bits - return bits 32-63 of a number
+ * @n: the number we're accessing
+ *
+ * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
+ * the "right shift count >= width of type" warning when that quantity is
+ * 32-bits.
+ */
+#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
+
+/**
+ * lower_32_bits - return bits 0-31 of a number
+ * @n: the number we're accessing
+ */
+#define lower_32_bits(n) ((u32)((n) & 0xffffffff))
+
+/**
+ * upper_16_bits - return bits 16-31 of a number
+ * @n: the number we're accessing
+ */
+#define upper_16_bits(n) ((u16)((n) >> 16))
+
+/**
+ * lower_16_bits - return bits 0-15 of a number
+ * @n: the number we're accessing
+ */
+#define lower_16_bits(n) ((u16)((n) & 0xffff))
+
 /**
  * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value
  * @x: value to repeat
-- 
2.43.0.rc1.1.gbec44491f096