ARM: spectre: add Kconfig symbol for CPUs vulnerable to Spectre

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 41218867a9a604286b83a14bc83fa7908f115dcc..7ef92e6692abd21e24c0a070da4e7e8a4db9aa56 100644 (file)
--- 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