[PATCH v2 1/5] ARM: Add a neon-intrinsics.h header like on arm64

[Ard Biesheuvel <ardb+git@google.com>]

From: Ard Biesheuvel <ardb@kernel.org>

Add a header asm/neon-intrinsics.h similar to the one that arm64 has.
This makes it possible for NEON intrinsics code to be shared seamlessly
between ARM and arm64.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 Documentation/arch/arm/kernel_mode_neon.rst |  4 +-
 arch/arm/include/asm/neon-intrinsics.h      | 64 ++++++++++++++++++++
 2 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/Documentation/arch/arm/kernel_mode_neon.rst b/Documentation/arch/arm/kernel_mode_neon.rst
index 9bfb71a2a9b9..1efb6d35b7bd 100644
--- a/Documentation/arch/arm/kernel_mode_neon.rst
+++ b/Documentation/arch/arm/kernel_mode_neon.rst
@@ -121,4 +121,6 @@ observe the following in addition to the rules above:
 * Compile the unit containing the NEON intrinsics with '-ffreestanding' so GCC
   uses its builtin version of <stdint.h> (this is a C99 header which the kernel
   does not supply);
-* Include <arm_neon.h> last, or at least after <linux/types.h>
+* Do not include <arm_neon.h> directly: instead, include <asm/neon-intrinsics.h>,
+  which tweaks some macro definitions so that system headers can be included
+  safely.
diff --git a/arch/arm/include/asm/neon-intrinsics.h b/arch/arm/include/asm/neon-intrinsics.h
new file mode 100644
index 000000000000..3fe0b5ab9659
--- /dev/null
+++ b/arch/arm/include/asm/neon-intrinsics.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_NEON_INTRINSICS_H
+#define __ASM_NEON_INTRINSICS_H
+
+#ifndef __ARM_NEON__
+#error You should compile this file with '-march=armv7-a -mfloat-abi=softfp -mfpu=neon'
+#endif
+
+#include <asm-generic/int-ll64.h>
+
+/*
+ * The C99 types uintXX_t that are usually defined in 'stdint.h' are not as
+ * unambiguous on ARM as you would expect. For the types below, there is a
+ * difference on ARM between GCC built for bare metal ARM, GCC built for glibc
+ * and the kernel itself, which results in build errors if you try to build
+ * with -ffreestanding and include 'stdint.h' (such as when you include
+ * 'arm_neon.h' in order to use NEON intrinsics)
+ *
+ * As the typedefs for these types in 'stdint.h' are based on builtin defines
+ * supplied by GCC, we can tweak these to align with the kernel's idea of those
+ * types, so 'linux/types.h' and 'stdint.h' can be safely included from the
+ * same source file (provided that -ffreestanding is used).
+ *
+ *                    int32_t     uint32_t          intptr_t     uintptr_t
+ * bare metal GCC     long        unsigned long     int          unsigned int
+ * glibc GCC          int         unsigned int      int          unsigned int
+ * kernel             int         unsigned int      long         unsigned long
+ */
+
+#ifdef __INT32_TYPE__
+#undef __INT32_TYPE__
+#define __INT32_TYPE__		int
+#endif
+
+#ifdef __UINT32_TYPE__
+#undef __UINT32_TYPE__
+#define __UINT32_TYPE__		unsigned int
+#endif
+
+#ifdef __INTPTR_TYPE__
+#undef __INTPTR_TYPE__
+#define __INTPTR_TYPE__		long
+#endif
+
+#ifdef __UINTPTR_TYPE__
+#undef __UINTPTR_TYPE__
+#define __UINTPTR_TYPE__	unsigned long
+#endif
+
+/*
+ * genksyms chokes on the ARM NEON instrinsics system header, but we
+ * don't export anything it defines anyway, so just disregard when
+ * genksyms execute.
+ */
+#ifndef __GENKSYMS__
+#include <arm_neon.h>
+#endif
+
+#ifdef CONFIG_CC_IS_CLANG
+#pragma clang diagnostic ignored "-Wincompatible-pointer-types"
+#endif
+
+#endif /* __ASM_NEON_INTRINSICS_H */
-- 
2.53.0.1018.g2bb0e51243-goog