linux-kernel - [PATCH 4.4 41/75] ARM: bugs: prepare processor bug infrastructure

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Date:   Fri,  8 Nov 2019 19:49:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linus.walleij@...aro.org, rmk+kernel@...linux.org.uk, Ard Biesheuvel" 
        <ardb@...nel.org>, Russell King <rmk+kernel@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Marc Zyngier <marc.zyngier@....com>,
        "David A. Long" <dave.long@...aro.org>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH 4.4 41/75] ARM: bugs: prepare processor bug infrastructure

From: Russell King <rmk+kernel@...linux.org.uk>

Commit a5b9177f69329314721aa7022b7e69dab23fa1f0 upstream.

Prepare the processor bug infrastructure so that it can be expanded to
check for per-processor bugs.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Boot-tested-by: Tony Lindgren <tony@...mide.com>
Reviewed-by: Tony Lindgren <tony@...mide.com>
Acked-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: David A. Long <dave.long@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/include/asm/bugs.h |    4 ++--
 arch/arm/kernel/Makefile    |    1 +
 arch/arm/kernel/bugs.c      |    9 +++++++++
 3 files changed, 12 insertions(+), 2 deletions(-)

--- a/arch/arm/include/asm/bugs.h
+++ b/arch/arm/include/asm/bugs.h
@@ -10,10 +10,10 @@
 #ifndef __ASM_BUGS_H
 #define __ASM_BUGS_H
 
-#ifdef CONFIG_MMU
 extern void check_writebuffer_bugs(void);
 
-#define check_bugs() check_writebuffer_bugs()
+#ifdef CONFIG_MMU
+extern void check_bugs(void);
 #else
 #define check_bugs() do { } while (0)
 #endif
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -30,6 +30,7 @@ else
 obj-y		+= entry-armv.o
 endif
 
+obj-$(CONFIG_MMU)		+= bugs.o
 obj-$(CONFIG_CPU_IDLE)		+= cpuidle.o
 obj-$(CONFIG_ISA_DMA_API)	+= dma.o
 obj-$(CONFIG_FIQ)		+= fiq.o fiqasm.o
--- /dev/null
+++ b/arch/arm/kernel/bugs.c
@@ -0,0 +1,9 @@
+// SPDX-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <asm/bugs.h>
+#include <asm/proc-fns.h>
+
+void __init check_bugs(void)
+{
+	check_writebuffer_bugs();
+}