[4.9,V2,02/24] ARM: bugs: prepare processor bug infrastructure

Message ID 20181107164402.9380-3-dave.long@linaro.org
State New
Headers show
Series
  • V4.9 backport of 32-bit arm spectre patches
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Commit Message

David Long Nov. 7, 2018, 4:43 p.m.
From: Russell King <rmk+kernel@armlinux.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@armlinux.org.uk>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

Boot-tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>

Acked-by: Marc Zyngier <marc.zyngier@arm.com>

Signed-off-by: David A. Long <dave.long@linaro.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(-)
 create mode 100644 arch/arm/kernel/bugs.c

-- 
2.17.1

Patch

diff --git a/arch/arm/include/asm/bugs.h b/arch/arm/include/asm/bugs.h
index a97f1ea708d1..ed122d294f3f 100644
--- 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
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index ad325a8c7e1e..adb9add28b6f 100644
--- 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
diff --git a/arch/arm/kernel/bugs.c b/arch/arm/kernel/bugs.c
new file mode 100644
index 000000000000..88024028bb70
--- /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();
+}