From: Will Deacon <will.deacon@arm.com>
To: linux-kernel@vger.kernel.org
Cc: peterz@infradead.org, mingo@kernel.org,
linux-arm-kernel@lists.infradead.org,
yamada.masahiro@socionext.com, Will Deacon <will.deacon@arm.com>
Subject: [PATCH 3/9] asm-generic: Move some macros from linux/bitops.h to a new bits.h file
Date: Thu, 24 May 2018 11:59:40 +0100 [thread overview]
Message-ID: <1527159586-8578-4-git-send-email-will.deacon@arm.com> (raw)
In-Reply-To: <1527159586-8578-1-git-send-email-will.deacon@arm.com>
In preparation for implementing the asm-generic atomic bitops in terms
of atomic_long_*, we need to prevent asm/atomic.h implementations from
pulling in linux/bitops.h. A common reason for this include is for the
BITS_PER_BYTE definition, so move this and some other BIT and masking
macros into a new header file, linux/bits.h
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
include/linux/bitops.h | 22 +---------------------
include/linux/bits.h | 26 ++++++++++++++++++++++++++
2 files changed, 27 insertions(+), 21 deletions(-)
create mode 100644 include/linux/bits.h
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 4cac4e1a72ff..af419012d77d 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -2,29 +2,9 @@
#ifndef _LINUX_BITOPS_H
#define _LINUX_BITOPS_H
#include <asm/types.h>
+#include <linux/bits.h>
-#ifdef __KERNEL__
-#define BIT(nr) (1UL << (nr))
-#define BIT_ULL(nr) (1ULL << (nr))
-#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
-#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
-#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
-#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
-#define BITS_PER_BYTE 8
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
-#endif
-
-/*
- * Create a contiguous bitmask starting at bit position @l and ending at
- * position @h. For example
- * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
- */
-#define GENMASK(h, l) \
- (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
-
-#define GENMASK_ULL(h, l) \
- (((~0ULL) - (1ULL << (l)) + 1) & \
- (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
extern unsigned int __sw_hweight8(unsigned int w);
extern unsigned int __sw_hweight16(unsigned int w);
diff --git a/include/linux/bits.h b/include/linux/bits.h
new file mode 100644
index 000000000000..2b7b532c1d51
--- /dev/null
+++ b/include/linux/bits.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_BITS_H
+#define __LINUX_BITS_H
+#include <asm/bitsperlong.h>
+
+#define BIT(nr) (1UL << (nr))
+#define BIT_ULL(nr) (1ULL << (nr))
+#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
+#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
+#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
+#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
+#define BITS_PER_BYTE 8
+
+/*
+ * Create a contiguous bitmask starting at bit position @l and ending at
+ * position @h. For example
+ * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
+ */
+#define GENMASK(h, l) \
+ (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
+
+#define GENMASK_ULL(h, l) \
+ (((~0ULL) - (1ULL << (l)) + 1) & \
+ (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
+
+#endif /* __LINUX_BITS_H */
--
2.1.4
next prev parent reply other threads:[~2018-05-24 10:59 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-24 10:59 [PATCH 0/9] Rewrite asm-generic/bitops/{atomic,lock}.h and use on arm64 Will Deacon
2018-05-24 10:59 ` [PATCH 1/9] h8300: Don't include linux/kernel.h in asm/atomic.h Will Deacon
2018-07-22 13:58 ` Yoshinori Sato
2018-05-24 10:59 ` [PATCH 2/9] m68k: Don't use asm-generic/bitops/lock.h Will Deacon
2018-05-24 10:59 ` Will Deacon [this message]
2018-05-24 10:59 ` [PATCH 4/9] openrisc: Don't pull in all of linux/bitops.h in asm/cmpxchg.h Will Deacon
2018-05-24 10:59 ` [PATCH 5/9] sh: Don't pull in all of linux/bitops.h in asm/cmpxchg-xchg.h Will Deacon
2018-05-24 10:59 ` [PATCH 6/9] asm-generic/bitops/atomic.h: Rewrite using atomic_fetch_* Will Deacon
2018-05-24 12:44 ` Peter Zijlstra
2018-05-24 12:47 ` Will Deacon
2018-05-24 13:09 ` Mark Rutland
2018-05-24 22:06 ` Andrea Parri
2018-05-24 22:32 ` Peter Zijlstra
2018-05-24 10:59 ` [PATCH 7/9] asm-generic/bitops/lock.h: " Will Deacon
2018-05-24 10:59 ` [PATCH 8/9] arm64: Replace our atomic/lock bitop implementations with asm-generic Will Deacon
2018-05-24 10:59 ` [PATCH 9/9] arm64: bitops: Include <asm-generic/bitops/ext2-atomic-setbit.h> Will Deacon
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