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Message-Id: <1686567694-20099-2-git-send-email-yangtiezhu@loongson.cn>
Date: Mon, 12 Jun 2023 19:01:33 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Arnd Bergmann <arnd@...db.de>
Cc: linux-arm-kernel@...ts.infradead.org,
linux-riscv@...ts.infradead.org, loongarch@...ts.linux.dev,
linux-arch@...r.kernel.org, bpf@...r.kernel.org,
linux-perf-users@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: [PATCH v1 1/2] asm-generic: Unify uapi bitsperlong.h for arm64, riscv and loongarch
Now we specify the minimal version of GCC as 5.1 and Clang/LLVM as 11.0.0
in Documentation/process/changes.rst, __CHAR_BIT__ and __SIZEOF_LONG__ are
usable, it is probably fine to unify the definition of __BITS_PER_LONG as
(__CHAR_BIT__ * __SIZEOF_LONG__) in asm-generic uapi bitsperlong.h.
In order to keep safe and avoid regression, only unify uapi bitsperlong.h
for arm64, riscv and loongarch which are added since the linux-3.x days.
Suggested-by: Xi Ruoyao <xry111@...111.site>
Link: https://lore.kernel.org/all/d3e255e4746de44c9903c4433616d44ffcf18d1b.camel@xry111.site/
Suggested-by: Arnd Bergmann <arnd@...db.de>
Link: https://lore.kernel.org/linux-arch/a3a4f48a-07d4-4ed9-bc53-5d383428bdd2@app.fastmail.com/
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
arch/arm64/include/uapi/asm/bitsperlong.h | 24 ----------------------
arch/loongarch/include/uapi/asm/bitsperlong.h | 9 --------
arch/riscv/include/uapi/asm/bitsperlong.h | 14 -------------
include/uapi/asm-generic/bitsperlong.h | 10 +++++++++
tools/arch/arm64/include/uapi/asm/bitsperlong.h | 24 ----------------------
.../arch/loongarch/include/uapi/asm/bitsperlong.h | 9 --------
tools/arch/riscv/include/uapi/asm/bitsperlong.h | 14 -------------
tools/include/uapi/asm-generic/bitsperlong.h | 11 ++++++++++
tools/include/uapi/asm/bitsperlong.h | 6 ------
9 files changed, 21 insertions(+), 100 deletions(-)
delete mode 100644 arch/arm64/include/uapi/asm/bitsperlong.h
delete mode 100644 arch/loongarch/include/uapi/asm/bitsperlong.h
delete mode 100644 arch/riscv/include/uapi/asm/bitsperlong.h
delete mode 100644 tools/arch/arm64/include/uapi/asm/bitsperlong.h
delete mode 100644 tools/arch/loongarch/include/uapi/asm/bitsperlong.h
delete mode 100644 tools/arch/riscv/include/uapi/asm/bitsperlong.h
diff --git a/arch/arm64/include/uapi/asm/bitsperlong.h b/arch/arm64/include/uapi/asm/bitsperlong.h
deleted file mode 100644
index 485d60be..0000000
--- a/arch/arm64/include/uapi/asm/bitsperlong.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-/*
- * Copyright (C) 2012 ARM Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#ifndef __ASM_BITSPERLONG_H
-#define __ASM_BITSPERLONG_H
-
-#define __BITS_PER_LONG 64
-
-#include <asm-generic/bitsperlong.h>
-
-#endif /* __ASM_BITSPERLONG_H */
diff --git a/arch/loongarch/include/uapi/asm/bitsperlong.h b/arch/loongarch/include/uapi/asm/bitsperlong.h
deleted file mode 100644
index 00b4ba1..0000000
--- a/arch/loongarch/include/uapi/asm/bitsperlong.h
+++ /dev/null
@@ -1,9 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef __ASM_LOONGARCH_BITSPERLONG_H
-#define __ASM_LOONGARCH_BITSPERLONG_H
-
-#define __BITS_PER_LONG (__SIZEOF_LONG__ * 8)
-
-#include <asm-generic/bitsperlong.h>
-
-#endif /* __ASM_LOONGARCH_BITSPERLONG_H */
diff --git a/arch/riscv/include/uapi/asm/bitsperlong.h b/arch/riscv/include/uapi/asm/bitsperlong.h
deleted file mode 100644
index 7d0b32e..0000000
--- a/arch/riscv/include/uapi/asm/bitsperlong.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
-/*
- * Copyright (C) 2012 ARM Ltd.
- * Copyright (C) 2015 Regents of the University of California
- */
-
-#ifndef _UAPI_ASM_RISCV_BITSPERLONG_H
-#define _UAPI_ASM_RISCV_BITSPERLONG_H
-
-#define __BITS_PER_LONG (__SIZEOF_POINTER__ * 8)
-
-#include <asm-generic/bitsperlong.h>
-
-#endif /* _UAPI_ASM_RISCV_BITSPERLONG_H */
diff --git a/include/uapi/asm-generic/bitsperlong.h b/include/uapi/asm-generic/bitsperlong.h
index 693d9a4..fb104f9 100644
--- a/include/uapi/asm-generic/bitsperlong.h
+++ b/include/uapi/asm-generic/bitsperlong.h
@@ -3,6 +3,15 @@
#define _UAPI__ASM_GENERIC_BITS_PER_LONG
/*
+ * In order to keep safe and avoid regression, only unify uapi
+ * bitsperlong.h for arm64, riscv and loongarch which are added
+ * since the linux-3.x days. See the following link for more info:
+ * https://lore.kernel.org/linux-arch/b9624545-2c80-49a1-ac3c-39264a591f7b@app.fastmail.com/
+ */
+#if defined(__aarch64__) || defined(__riscv) || defined(__loongarch__)
+#define __BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
+#else
+/*
* There seems to be no way of detecting this automatically from user
* space, so 64 bit architectures should override this in their
* bitsperlong.h. In particular, an architecture that supports
@@ -12,5 +21,6 @@
#ifndef __BITS_PER_LONG
#define __BITS_PER_LONG 32
#endif
+#endif
#endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */
diff --git a/tools/arch/arm64/include/uapi/asm/bitsperlong.h b/tools/arch/arm64/include/uapi/asm/bitsperlong.h
deleted file mode 100644
index 485d60be..0000000
--- a/tools/arch/arm64/include/uapi/asm/bitsperlong.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-/*
- * Copyright (C) 2012 ARM Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#ifndef __ASM_BITSPERLONG_H
-#define __ASM_BITSPERLONG_H
-
-#define __BITS_PER_LONG 64
-
-#include <asm-generic/bitsperlong.h>
-
-#endif /* __ASM_BITSPERLONG_H */
diff --git a/tools/arch/loongarch/include/uapi/asm/bitsperlong.h b/tools/arch/loongarch/include/uapi/asm/bitsperlong.h
deleted file mode 100644
index 00b4ba1..0000000
--- a/tools/arch/loongarch/include/uapi/asm/bitsperlong.h
+++ /dev/null
@@ -1,9 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef __ASM_LOONGARCH_BITSPERLONG_H
-#define __ASM_LOONGARCH_BITSPERLONG_H
-
-#define __BITS_PER_LONG (__SIZEOF_LONG__ * 8)
-
-#include <asm-generic/bitsperlong.h>
-
-#endif /* __ASM_LOONGARCH_BITSPERLONG_H */
diff --git a/tools/arch/riscv/include/uapi/asm/bitsperlong.h b/tools/arch/riscv/include/uapi/asm/bitsperlong.h
deleted file mode 100644
index 0b9b58b..0000000
--- a/tools/arch/riscv/include/uapi/asm/bitsperlong.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2012 ARM Ltd.
- * Copyright (C) 2015 Regents of the University of California
- */
-
-#ifndef _UAPI_ASM_RISCV_BITSPERLONG_H
-#define _UAPI_ASM_RISCV_BITSPERLONG_H
-
-#define __BITS_PER_LONG (__SIZEOF_POINTER__ * 8)
-
-#include <asm-generic/bitsperlong.h>
-
-#endif /* _UAPI_ASM_RISCV_BITSPERLONG_H */
diff --git a/tools/include/uapi/asm-generic/bitsperlong.h b/tools/include/uapi/asm-generic/bitsperlong.h
index 23e6c41..fb104f9 100644
--- a/tools/include/uapi/asm-generic/bitsperlong.h
+++ b/tools/include/uapi/asm-generic/bitsperlong.h
@@ -1,7 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI__ASM_GENERIC_BITS_PER_LONG
#define _UAPI__ASM_GENERIC_BITS_PER_LONG
/*
+ * In order to keep safe and avoid regression, only unify uapi
+ * bitsperlong.h for arm64, riscv and loongarch which are added
+ * since the linux-3.x days. See the following link for more info:
+ * https://lore.kernel.org/linux-arch/b9624545-2c80-49a1-ac3c-39264a591f7b@app.fastmail.com/
+ */
+#if defined(__aarch64__) || defined(__riscv) || defined(__loongarch__)
+#define __BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
+#else
+/*
* There seems to be no way of detecting this automatically from user
* space, so 64 bit architectures should override this in their
* bitsperlong.h. In particular, an architecture that supports
@@ -11,5 +21,6 @@
#ifndef __BITS_PER_LONG
#define __BITS_PER_LONG 32
#endif
+#endif
#endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */
diff --git a/tools/include/uapi/asm/bitsperlong.h b/tools/include/uapi/asm/bitsperlong.h
index da52065..c65267a 100644
--- a/tools/include/uapi/asm/bitsperlong.h
+++ b/tools/include/uapi/asm/bitsperlong.h
@@ -1,8 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0 */
#if defined(__i386__) || defined(__x86_64__)
#include "../../../arch/x86/include/uapi/asm/bitsperlong.h"
-#elif defined(__aarch64__)
-#include "../../../arch/arm64/include/uapi/asm/bitsperlong.h"
#elif defined(__powerpc__)
#include "../../../arch/powerpc/include/uapi/asm/bitsperlong.h"
#elif defined(__s390__)
@@ -13,12 +11,8 @@
#include "../../../arch/mips/include/uapi/asm/bitsperlong.h"
#elif defined(__ia64__)
#include "../../../arch/ia64/include/uapi/asm/bitsperlong.h"
-#elif defined(__riscv)
-#include "../../../arch/riscv/include/uapi/asm/bitsperlong.h"
#elif defined(__alpha__)
#include "../../../arch/alpha/include/uapi/asm/bitsperlong.h"
-#elif defined(__loongarch__)
-#include "../../../arch/loongarch/include/uapi/asm/bitsperlong.h"
#else
#include <asm-generic/bitsperlong.h>
#endif
--
2.1.0
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