linux-kernel - [PATCH V2 1/2] uapi: Define GENMASK

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Message-Id: <20240725054808.286708-2-anshuman.khandual@arm.com>
Date: Thu, 25 Jul 2024 11:18:07 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-kernel@...r.kernel.org
Cc: anshuman.khandual@....com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yury Norov <yury.norov@...il.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org
Subject: [PATCH V2 1/2] uapi: Define GENMASK_U128

This adds GENMASK_U128() and __GENMASK_U128() macros using __BITS_PER_U128
and __int128 data types. These macros will be used in providing support for
generating 128 bit masks.

Cc: Yury Norov <yury.norov@...il.com>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Arnd Bergmann <arnd@...db.de>>
Cc: linux-kernel@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 include/linux/bits.h                   | 2 ++
 include/uapi/asm-generic/bitsperlong.h | 2 ++
 include/uapi/linux/bits.h              | 3 +++
 include/uapi/linux/const.h             | 1 +
 4 files changed, 8 insertions(+)

diff --git a/include/linux/bits.h b/include/linux/bits.h
index 0eb24d21aac2..0a174cce09d2 100644
--- a/include/linux/bits.h
+++ b/include/linux/bits.h
@@ -35,5 +35,7 @@
 	(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
 #define GENMASK_ULL(h, l) \
 	(GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l))
+#define GENMASK_U128(h, l) \
+	(GENMASK_INPUT_CHECK(h, l) + __GENMASK_U128(h, l))
 
 #endif	/* __LINUX_BITS_H */
diff --git a/include/uapi/asm-generic/bitsperlong.h b/include/uapi/asm-generic/bitsperlong.h
index fadb3f857f28..6275367b17bb 100644
--- a/include/uapi/asm-generic/bitsperlong.h
+++ b/include/uapi/asm-generic/bitsperlong.h
@@ -28,4 +28,6 @@
 #define __BITS_PER_LONG_LONG 64
 #endif
 
+#define __BITS_PER_U128 128
+
 #endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */
diff --git a/include/uapi/linux/bits.h b/include/uapi/linux/bits.h
index 3c2a101986a3..4d4b7b08003c 100644
--- a/include/uapi/linux/bits.h
+++ b/include/uapi/linux/bits.h
@@ -12,4 +12,7 @@
         (((~_ULL(0)) - (_ULL(1) << (l)) + 1) & \
          (~_ULL(0) >> (__BITS_PER_LONG_LONG - 1 - (h))))
 
+#define __GENMASK_U128(h, l) \
+	((_BIT128((h) + 1)) - (_BIT128(l)))
+
 #endif /* _UAPI_LINUX_BITS_H */
diff --git a/include/uapi/linux/const.h b/include/uapi/linux/const.h
index a429381e7ca5..a0211136dfd8 100644
--- a/include/uapi/linux/const.h
+++ b/include/uapi/linux/const.h
@@ -27,6 +27,7 @@
 
 #define _BITUL(x)	(_UL(1) << (x))
 #define _BITULL(x)	(_ULL(1) << (x))
+#define _BIT128(x)	((unsigned __int128)(1) << (x))
 
 #define __ALIGN_KERNEL(x, a)		__ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1)
 #define __ALIGN_KERNEL_MASK(x, mask)	(((x) + (mask)) & ~(mask))
-- 
2.30.2