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 <[email protected]> --- 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 _______________________________________________ Linux-nvdimm mailing list -- [email protected] To unsubscribe send an email to [email protected]
