On Sep 27, 2022, at 9:29 AM, Chih-En Lin <shiyn.lin@xxxxxxxxx> wrote:
> Add MMF_COW_PTE{, _READY} flags to prepare the subsequent
> implementation of Copy-On-Write for the page table.
>
> Signed-off-by: Chih-En Lin <shiyn.lin@xxxxxxxxx>
> ---
> include/linux/sched/coredump.h | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h
> index 4d0a5be28b70f..f03ff69c90c8c 100644
> --- a/include/linux/sched/coredump.h
> +++ b/include/linux/sched/coredump.h
> @@ -84,7 +84,13 @@ static inline int get_dumpable(struct mm_struct *mm)
> #define MMF_HAS_PINNED 28 /* FOLL_PIN has run, never cleared */
> #define MMF_DISABLE_THP_MASK (1 << MMF_DISABLE_THP)
>
> +#define MMF_COW_PTE_READY 29
> +#define MMF_COW_PTE_READY_MASK (1 << MMF_COW_PTE_READY)
> +
> +#define MMF_COW_PTE 30
> +#define MMF_COW_PTE_MASK (1 << MMF_COW_PTE)
I am not sure how much sense it makes to put it in a separate patch, and it
is rather hard to understand the new flags without proper documentation and
comments.
