linux-kernel - [PATCH 4.9 40/59] ARM: spectre: add Kconfig symbol for CPUs vulnerable to Spectre

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Date:   Wed, 21 Nov 2018 20:06:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.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>
Subject: [PATCH 4.9 40/59] ARM: spectre: add Kconfig symbol for CPUs vulnerable to Spectre

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Russell King <rmk+kernel@...linux.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@...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>
---
 arch/arm/mm/Kconfig |    4 ++++
 1 file changed, 4 insertions(+)

--- 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
@@ -800,6 +801,9 @@ 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