linux-kernel - [PATCH 15/19] mips: vdso: Enable mips to use common headers

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Date:   Thu, 13 Feb 2020 16:16:10 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        clang-built-linux@...glegroups.com, x86@...nel.org
Cc:     catalin.marinas@....com, will.deacon@....com, arnd@...db.de,
        linux@...linux.org.uk, paul.burton@...s.com, tglx@...utronix.de,
        luto@...nel.org, mingo@...hat.com, bp@...en8.de, sboyd@...nel.org,
        salyzyn@...roid.com, pcc@...gle.com, 0x7f454c46@...il.com,
        ndesaulniers@...gle.com, avagin@...nvz.org
Subject: [PATCH 15/19] mips: vdso: Enable mips to use common headers

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

Cc: Paul Burton <paulburton@...nel.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
---
 arch/mips/include/asm/common/processor.h  | 27 +++++++++++++++++++++++
 arch/mips/include/asm/processor.h         | 16 +-------------
 arch/mips/include/asm/vdso/gettimeofday.h |  4 ----
 3 files changed, 28 insertions(+), 19 deletions(-)
 create mode 100644 arch/mips/include/asm/common/processor.h

diff --git a/arch/mips/include/asm/common/processor.h b/arch/mips/include/asm/common/processor.h
new file mode 100644
index 000000000000..d2ee5d397d2b
--- /dev/null
+++ b/arch/mips/include/asm/common/processor.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 ARM Ltd.
+ */
+#ifndef __ASM_COMMON_PROCESSOR_H
+#define __ASM_COMMON_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_COMMON_PROCESSOR_H */
diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
index 7619ad319400..b7eca25e2066 100644
--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -22,6 +22,7 @@
 #include <asm/dsemul.h>
 #include <asm/mipsregs.h>
 #include <asm/prefetch.h>
+#include <asm/common/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
diff --git a/arch/mips/include/asm/vdso/gettimeofday.h b/arch/mips/include/asm/vdso/gettimeofday.h
index a58687e26c5d..e8ab2fafe067 100644
--- a/arch/mips/include/asm/vdso/gettimeofday.h
+++ b/arch/mips/include/asm/vdso/gettimeofday.h
@@ -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>
 
-- 
2.25.0