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mips: vdso: Enable mips to use common headers 

Enable mips to use only the common headers in the implementation of
the vDSO library.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul Burton <paulburton@kernel.org>
Link: https://lkml.kernel.org/r/20200320145351.32292-23-vincenzo.frascino@arm.com
This commit is contained in:
Vincenzo Frascino 2020-03-20 14:53:47 +00:00 committed by Thomas Gleixner
parent 5340e87357
commit c135fc875c
3 changed files with 28 additions and 19 deletions
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16
arch/mips/include/asm/processor.h
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@ -22,6 +22,7 @@
#include <asm/dsemul.h>
#include <asm/mipsregs.h>
#include <asm/prefetch.h>
#include <asm/vdso/processor.h>
/*
* System setup and hardware flags..
@ -385,21 +386,6 @@ unsigned long get_wchan(struct task_struct *p);
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
#ifdef CONFIG_CPU_LOONGSON64
/*
* Loongson-3's SFB (Store-Fill-Buffer) may buffer writes indefinitely when a
* tight read loop is executed, because reads take priority over writes & the
* hardware (incorrectly) doesn't ensure that writes will eventually occur.
*
* Since spin loops of any kind should have a cpu_relax() in them, force an SFB
* flush from cpu_relax() such that any pending writes will become visible as
* expected.
*/
#define cpu_relax() smp_mb()
#else
#define cpu_relax() barrier()
#endif
/*
* Return_address is a replacement for __builtin_return_address(count)
* which on certain architectures cannot reasonably be implemented in GCC

4
arch/mips/include/asm/vdso/gettimeofday.h
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@ -13,12 +13,8 @@
#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/time.h>
#include <asm/vdso/vdso.h>
#include <asm/clocksource.h>
#include <asm/io.h>
#include <asm/unistd.h>
#include <asm/vdso.h>

27
arch/mips/include/asm/vdso/processor.h Normal file
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@ -0,0 +1,27 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2020 ARM Ltd.
*/
#ifndef __ASM_VDSO_PROCESSOR_H
#define __ASM_VDSO_PROCESSOR_H
#ifndef __ASSEMBLY__
#ifdef CONFIG_CPU_LOONGSON64
/*
* Loongson-3's SFB (Store-Fill-Buffer) may buffer writes indefinitely when a
* tight read loop is executed, because reads take priority over writes & the
* hardware (incorrectly) doesn't ensure that writes will eventually occur.
*
* Since spin loops of any kind should have a cpu_relax() in them, force an SFB
* flush from cpu_relax() such that any pending writes will become visible as
* expected.
*/
#define cpu_relax() smp_mb()
#else
#define cpu_relax() barrier()
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ASM_VDSO_PROCESSOR_H */