This configuration variable will be used to build the code needed to free user PTE page table pages. The PTE page table setting and clearing functions(such as set_pte_at()) are in the architecture's files, and these functions will be hooked to implement FREE_USER_PTE, so the architecture support is needed. Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> --- mm/Kconfig | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/mm/Kconfig b/mm/Kconfig index 034d87953600..af99ed626732 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -909,6 +909,16 @@ config ANON_VMA_NAME area from being merged with adjacent virtual memory areas due to the difference in their name. +config ARCH_SUPPORTS_FREE_USER_PTE + def_bool n + +config FREE_USER_PTE + bool "Free user PTE page tables" + default y + depends on ARCH_SUPPORTS_FREE_USER_PTE && MMU && SMP + help + Try to free user PTE page table page when its all entries are none. + source "mm/damon/Kconfig" endmenu -- 2.20.1
