This adds a kernel config option that controls whether MAP_SYNC is enabled by
default. With POWER10, architecture is adding new pmem flush and sync
instructions. The kernel should prevent the usage of MAP_SYNC if applications
are not using the new instructions on newer hardware.
This config allows user to control whether MAP_SYNC should be enabled by
default or not.
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
---
arch/powerpc/platforms/Kconfig.cputype | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/powerpc/platforms/Kconfig.cputype
b/arch/powerpc/platforms/Kconfig.cputype
index 27a81c291be8..f8694838ad4e 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -383,6 +383,15 @@ config PPC_KUEP
If you're unsure, say Y.
+config ARCH_MAP_SYNC_DISABLE
+ bool "Disable synchronous fault support (MAP_SYNC)"
+ default y
+ help
+ Disable support for synchronous fault with nvdimm namespaces.
+
+ If you're unsure, say Y.
+
+
config PPC_HAVE_KUAP
bool
--
2.26.2
