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 <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Paul Burton <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]

arch/mips/include/asm/processor.h

···
 #include <asm/dsemul.h>
 #include <asm/mipsregs.h>
 #include <asm/prefetch.h>
+#include <asm/vdso/processor.h>
 
 /*
  * System setup and hardware flags..
···
 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
 #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)

arch/mips/include/asm/vdso/gettimeofday.h

···
 
 #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>
 

arch/mips/include/asm/vdso/processor.h

···
+/* 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 */