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[for-stable-v4.4,24/53] ARM: spectre: add Kconfig symbol for CPUs vulnerable to Spectre

Message ID 20191105205846.1394-25-ardb@kernel.org (mailing list archive)
State New, archived
Headers show
Series ARM: spectre v1/v2 mitigations | expand

Commit Message

Ard Biesheuvel Nov. 5, 2019, 8:58 p.m. UTC 
From: Russell King <rmk+kernel@armlinux.org.uk>

Commit c58d237d0852a57fde9bc2c310972e8f4e3d155d upstream.

Add a Kconfig symbol for CPUs which are vulnerable to the Spectre
attacks.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm/mm/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 41218867a9a6..7ef92e6692ab 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -396,6 +396,7 @@  config CPU_V7
 	select CPU_CP15_MPU if !MMU
 	select CPU_HAS_ASID if MMU
 	select CPU_PABRT_V7
+	select CPU_SPECTRE if MMU
 	select CPU_TLB_V7 if MMU
 
 # ARMv7M
@@ -793,6 +794,9 @@  config CPU_BPREDICT_DISABLE
 	help
 	  Say Y here to disable branch prediction.  If unsure, say N.
 
+config CPU_SPECTRE
+	bool
+
 config TLS_REG_EMUL
 	bool
 	select NEED_KUSER_HELPERS