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157f9533f9
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembler code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. Defining such a macro was necessary in the early days of the kernel, since GCC only started providing __ASSEMBLER__ since version 3.0 in 2000 (see https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=f8f769ea4e69 ). However, having two macros can be very confusing nowadays for the developers when switching between userspace and kernelspace coding, or when dealing with uapi headers that should use __ASSEMBLER__ instead. So let's now standardize on the __ASSEMBLER__ macro that is provided by the compilers. This is almost a completely mechanical patch (done with a simple "sed -i" statement), with just one comment tweaked manually in arch/mips/include/asm/cpu.h (that was missing some underscores). Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: linux-mips@vger.kernel.org Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Maciej W. Rozycki <macro@orcam.me.uk> Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
28 lines
747 B
C
28 lines
747 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020 ARM Ltd.
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*/
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#ifndef __ASM_VDSO_PROCESSOR_H
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#define __ASM_VDSO_PROCESSOR_H
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#ifndef __ASSEMBLER__
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#ifdef CONFIG_CPU_LOONGSON64
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/*
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* Loongson-3's SFB (Store-Fill-Buffer) may buffer writes indefinitely when a
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* tight read loop is executed, because reads take priority over writes & the
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* hardware (incorrectly) doesn't ensure that writes will eventually occur.
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*
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* Since spin loops of any kind should have a cpu_relax() in them, force an SFB
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* flush from cpu_relax() such that any pending writes will become visible as
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* expected.
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*/
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#define cpu_relax() smp_mb()
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#else
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#define cpu_relax() barrier()
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#endif
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#endif /* __ASSEMBLER__ */
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#endif /* __ASM_VDSO_PROCESSOR_H */
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