mirror of
https://github.com/linux-msm/laptops-kernel.git
synced 2026-08-13 14:19:53 -07:00
Thomas HuthandYury Norov
6ec1241416
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize now on the __ASSEMBLER__ macro that is provided by the compilers. This is a completely mechanical patch (done with a simple "sed -i" statement). Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Yury Norov <ynorov@nvidia.com>
90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_BITS_H
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#define __LINUX_BITS_H
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#include <vdso/bits.h>
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#include <uapi/linux/bits.h>
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#define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG))
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#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
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#define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG))
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#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
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#define BITS_PER_BYTE 8
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#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
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/*
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* Create a contiguous bitmask starting at bit position @l and ending at
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* position @h. For example
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* GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
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*/
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#if !defined(__ASSEMBLER__)
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/*
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* Missing asm support
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*
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* GENMASK_U*() and BIT_U*() depend on BITS_PER_TYPE() which relies on sizeof(),
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* something not available in asm. Nevertheless, fixed width integers is a C
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* concept. Assembly code can rely on the long and long long versions instead.
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*/
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#include <linux/build_bug.h>
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#include <linux/compiler.h>
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#include <linux/overflow.h>
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#define GENMASK_INPUT_CHECK(h, l) BUILD_BUG_ON_ZERO(const_true((l) > (h)))
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/*
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* Generate a mask for the specified type @t. Additional checks are made to
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* guarantee the value returned fits in that type, relying on
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* -Wshift-count-overflow compiler check to detect incompatible arguments.
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* For example, all these create build errors or warnings:
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*
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* - GENMASK(15, 20): wrong argument order
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* - GENMASK(72, 15): doesn't fit unsigned long
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* - GENMASK_U32(33, 15): doesn't fit in a u32
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*/
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#define GENMASK_TYPE(t, h, l) \
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((t)(GENMASK_INPUT_CHECK(h, l) + \
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(type_max(t) << (l) & \
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type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
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#define GENMASK(h, l) GENMASK_TYPE(unsigned long, h, l)
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#define GENMASK_ULL(h, l) GENMASK_TYPE(unsigned long long, h, l)
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#define GENMASK_U8(h, l) GENMASK_TYPE(u8, h, l)
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#define GENMASK_U16(h, l) GENMASK_TYPE(u16, h, l)
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#define GENMASK_U32(h, l) GENMASK_TYPE(u32, h, l)
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#define GENMASK_U64(h, l) GENMASK_TYPE(u64, h, l)
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#define GENMASK_U128(h, l) GENMASK_TYPE(u128, h, l)
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/*
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* Fixed-type variants of BIT(), with additional checks like GENMASK_TYPE(). The
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* following examples generate compiler warnings due to -Wshift-count-overflow:
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*
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* - BIT_U8(8)
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* - BIT_U32(-1)
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* - BIT_U32(40)
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*/
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#define BIT_INPUT_CHECK(type, nr) \
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BUILD_BUG_ON_ZERO(const_true((nr) >= BITS_PER_TYPE(type)))
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#define BIT_TYPE(type, nr) ((type)(BIT_INPUT_CHECK(type, nr) + BIT_ULL(nr)))
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#define BIT_U8(nr) BIT_TYPE(u8, nr)
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#define BIT_U16(nr) BIT_TYPE(u16, nr)
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#define BIT_U32(nr) BIT_TYPE(u32, nr)
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#define BIT_U64(nr) BIT_TYPE(u64, nr)
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#else /* defined(__ASSEMBLER__) */
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/*
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* BUILD_BUG_ON_ZERO is not available in h files included from asm files,
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* disable the input check if that is the case.
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*/
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#define GENMASK(h, l) __GENMASK(h, l)
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#define GENMASK_ULL(h, l) __GENMASK_ULL(h, l)
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#endif /* !defined(__ASSEMBLER__) */
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#endif /* __LINUX_BITS_H */
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