The patch titled
Subject: linux/const.h: move BIT(_ULL) to linux/const.h for use in assembly
has been added to the -mm tree. Its filename is
linux-consth-move-bit_ull-to-linux-consth-for-use-in-assembly.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/linux-consth-move-bit_ull-to-linux-consth-for-use-in-assembly.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/linux-consth-move-bit_ull-to-linux-consth-for-use-in-assembly.patch
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------------------------------------------------------
From: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Subject: linux/const.h: move BIT(_ULL) to linux/const.h for use in assembly
Commit 2fc016c5bd8a ("linux/const.h: Add _BITUL() and _BITULL()")
introduced _BITUL() and _BITULL(). Its git-log says the difference
from the already existing BIT() are:
1. The namespace is such that they can be used in uapi definitions.
2. The type is set with the _AC() macro to allow it to be used in
assembly.
3. The type is explicitly specified to be UL or ULL.
However, I found _BITUL() is mostly used in kernel-space since it is
handy to share headers between C and assembly. If we only need '2.',
we can improve the existing BIT() for use in assembly, allowing us to
avoid unnecessary underscore prefixes.
Link: http://lkml.kernel.org/r/1519301715-31798-6-git-send-email-yamada.masahiro@xxxxxxxxxxxxx
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Guan Xuetao <gxt@xxxxxxxxxxxxxxx>
Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/bitops.h | 3 +--
include/linux/const.h | 3 +++
2 files changed, 4 insertions(+), 2 deletions(-)
diff -puN include/linux/bitops.h~linux-consth-move-bit_ull-to-linux-consth-for-use-in-assembly include/linux/bitops.h
--- a/include/linux/bitops.h~linux-consth-move-bit_ull-to-linux-consth-for-use-in-assembly
+++ a/include/linux/bitops.h
@@ -1,11 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_BITOPS_H
#define _LINUX_BITOPS_H
+#include <linux/const.h>
#include <asm/types.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))
diff -puN include/linux/const.h~linux-consth-move-bit_ull-to-linux-consth-for-use-in-assembly include/linux/const.h
--- a/include/linux/const.h~linux-consth-move-bit_ull-to-linux-consth-for-use-in-assembly
+++ a/include/linux/const.h
@@ -6,4 +6,7 @@
#define UL(x) (_UL(x))
#define ULL(x) (_ULL(x))
+#define BIT(x) (_BITUL(x))
+#define BIT_ULL(x) (_BITULL(x))
+
#endif /* _LINUX_CONST_H */
_
Patches currently in -mm which might be from yamada.masahiro@xxxxxxxxxxxxx are
linux-consth-prefix-include-guard-of-uapi-linux-consth-with-_uapi.patch
m68k-rename-ul-to-to_ul.patch
linux-consth-move-ul-macro-to-include-linux-consth.patch
linux-consth-refactor-_bitul-and-_bitull-a-bit.patch
linux-consth-move-bit_ull-to-linux-consth-for-use-in-assembly.patch
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