CONFIG_QCOM_FALKOR_ERRATUM_1009 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Falkor E1009: Prematurely complete a DSB after a TLBI

configname: CONFIG_QCOM_FALKOR_ERRATUM_1009

Linux Kernel Configuration
└─>Kernel Features
└─>ARM errata workarounds via the alternatives framework
└─>Falkor E1009: Prematurely complete a DSB after a TLBI
In linux kernel since version 4.2 (release Date: 2015-08-30)  
On Falkor v1, the CPU may prematurely complete a DSB following a
TLBI xxIS invalidate maintenance operation. Repeat the TLBI operation
one more time to fix the issue.

If unsure, say Y.