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3c349eacc5
This is a single fix, but it conflicts with some recent features. I'm merging it on top of the commit it fixes to ease backporting. * b4-shazam-merge: riscv: Fix build with CONFIG_CC_OPTIMIZE_FOR_SIZE=y Link: https://lore.kernel.org/r/20220922060958.44203-1-samuel@sholland.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
33 lines
673 B
C
33 lines
673 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __ASM_VDSO_PROCESSOR_H
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#define __ASM_VDSO_PROCESSOR_H
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#ifndef __ASSEMBLY__
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#include <asm/barrier.h>
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static inline void cpu_relax(void)
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{
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#ifdef __riscv_muldiv
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int dummy;
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/* In lieu of a halt instruction, induce a long-latency stall. */
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__asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
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#endif
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#ifdef __riscv_zihintpause
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/*
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* Reduce instruction retirement.
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* This assumes the PC changes.
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*/
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__asm__ __volatile__ ("pause");
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#else
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/* Encoding of the pause instruction */
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__asm__ __volatile__ (".4byte 0x100000F");
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#endif
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barrier();
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_VDSO_PROCESSOR_H */
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