linux-kernel - [PATCH 4.14 008/323] MIPS: Introduce isa-rev.h to define MIPS_ISA

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Date:   Thu, 20 May 2021 11:18:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paul Burton <paul.burton@...s.com>,
        Matt Redfearn <matt.redfearn@...s.com>,
        "Maciej W. Rozycki" <macro@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
        James Hogan <jhogan@...nel.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.14 008/323] MIPS: Introduce isa-rev.h to define MIPS_ISA_REV

From: Matt Redfearn <matt.redfearn@...s.com>

commit 1690905240fd45cc04e873312df8574631c9f595 upstream

There are multiple instances in the kernel where we need to include or
exclude particular instructions based on the ISA revision of the target
processor. For MIPS32 / MIPS64, the compiler exports a __mips_isa_rev
define. However, when targeting MIPS I - V, this define is absent. This
leads to each use of __mips_isa_rev having to check that it is defined
first. To simplify this, introduce the isa-rev.h header which always
exports MIPS_ISA_REV. The name is changed so as to avoid confusion with
the compiler builtin and to avoid accidentally using the builtin.
MIPS_ISA_REV is defined to the compilers builtin if provided, or 0,
which satisfies all current usages.

Suggested-by: Paul Burton <paul.burton@...s.com>
Signed-off-by: Matt Redfearn <matt.redfearn@...s.com>
Reviewed-by: Maciej W. Rozycki <macro@...s.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18676/
Signed-off-by: James Hogan <jhogan@...nel.org>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/mips/include/asm/isa-rev.h |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 arch/mips/include/asm/isa-rev.h

--- /dev/null
+++ b/arch/mips/include/asm/isa-rev.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 MIPS Tech, LLC
+ * Author: Matt Redfearn <matt.redfearn@...s.com>
+ */
+
+#ifndef __MIPS_ASM_ISA_REV_H__
+#define __MIPS_ASM_ISA_REV_H__
+
+/*
+ * The ISA revision level. This is 0 for MIPS I to V and N for
+ * MIPS{32,64}rN.
+ */
+
+/* If the compiler has defined __mips_isa_rev, believe it. */
+#ifdef __mips_isa_rev
+#define MIPS_ISA_REV __mips_isa_rev
+#else
+/* The compiler hasn't defined the isa rev so assume it's MIPS I - V (0) */
+#define MIPS_ISA_REV 0
+#endif
+
+
+#endif /* __MIPS_ASM_ISA_REV_H__ */