[PATCH v2 1/2] bitops: Move aligned_byte_mask() to wordpart.h

From: Andy Shevchenko
Date: Tue May 07 2024 - 16:07:47 EST


The bitops.h is for bit related operations. The aligned_byte_mask()
is about byte (or part of the machine word) operations, for which
we have a separate header, move the mentioned macro to wordpart.h
to consolidate similar operations.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
include/linux/bitops.h | 7 -------
include/linux/wordpart.h | 7 +++++++
lib/usercopy.c | 1 +
3 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 0b561ee6b4a4..ec45284c03f5 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -8,13 +8,6 @@

#include <uapi/linux/kernel.h>

-/* Set bits in the first 'n' bytes when loaded from memory */
-#ifdef __LITTLE_ENDIAN
-# define aligned_byte_mask(n) ((1UL << 8*(n))-1)
-#else
-# define aligned_byte_mask(n) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n)))
-#endif
-
#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
#define BITS_TO_LONGS(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
#define BITS_TO_U64(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
diff --git a/include/linux/wordpart.h b/include/linux/wordpart.h
index f6f8f83b15b0..4ca1ba66d2f0 100644
--- a/include/linux/wordpart.h
+++ b/include/linux/wordpart.h
@@ -39,4 +39,11 @@
*/
#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))

+/* Set bits in the first 'n' bytes when loaded from memory */
+#ifdef __LITTLE_ENDIAN
+# define aligned_byte_mask(n) ((1UL << 8*(n))-1)
+#else
+# define aligned_byte_mask(n) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n)))
+#endif
+
#endif // _LINUX_WORDPART_H
diff --git a/lib/usercopy.c b/lib/usercopy.c
index d29fe29c6849..4b62e6299cc8 100644
--- a/lib/usercopy.c
+++ b/lib/usercopy.c
@@ -3,6 +3,7 @@
#include <linux/fault-inject-usercopy.h>
#include <linux/instrumented.h>
#include <linux/uaccess.h>
+#include <linux/wordpart.h>
#include <linux/nospec.h>

/* out-of-line parts */
--
2.43.0.rc1.1336.g36b5255a03ac