On Thu, 27 Oct 2022, Dave Hansen wrote:
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 67745ceab0db..b68661d0633b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -69,6 +69,7 @@ config X86 select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI select ARCH_HAS_CACHE_LINE_SIZE + select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION if X86_64What is 64-bit only about this? I don't expect to have a lot of NVDIMMs or CXL devices on 32-bit kernels, but it would be nice to remove this if it's not strictly needed. Or, to add a changelog nugget that says: Restrict this to X86_64 kernels. It would probably work on 32- bit, but there is no practical reason to use 32-bit kernels and no one is testing them.
Yes, this was to further limit the potential users.
