Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

[linux-block.git] / arch / arm64 / Kconfig

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f6737d2f37b2fe96e5896f36c8e508d7130cf76a..505c8a1ccbe0cd043d672a8e1192e052ac73d84a 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -632,6 +632,23 @@ config ARM64_ERRATUM_1530923
 config ARM64_WORKAROUND_REPEAT_TLBI
        bool
 
+config ARM64_ERRATUM_2441007
+       bool "Cortex-A55: Completion of affected memory accesses might not be guaranteed by completion of a TLBI"
+       default y
+       select ARM64_WORKAROUND_REPEAT_TLBI
+       help
+         This option adds a workaround for ARM Cortex-A55 erratum #2441007.
+
+         Under very rare circumstances, affected Cortex-A55 CPUs
+         may not handle a race between a break-before-make sequence on one
+         CPU, and another CPU accessing the same page. This could allow a
+         store to a page that has been unmapped.
+
+         Work around this by adding the affected CPUs to the list that needs
+         TLB sequences to be done twice.
+
+         If unsure, say Y.
+
 config ARM64_ERRATUM_1286807
        bool "Cortex-A76: Modification of the translation table for a virtual address might lead to read-after-read ordering violation"
        default y