On Mon, Feb 08, 2021 at 10:02:27PM -0500, Peter Xu wrote: > We've got quite a few places (pte, pmd, pud) that explicitly checked against > whether we should break the cow right now during fork(). It's easier to > provide a helper, especially before we work the same thing on hugetlbfs. > > Since we'll reference is_cow_mapping() in mm.h, move it there too. Actually it > suites mm.h more since internal.h is mm/ only, but mm.h is exported to the > whole kernel. With that we should expect another patch to use is_cow_mapping() > whenever we can across the kernel since we do use it quite a lot but it's > always done with raw code against VM_* flags. > > Signed-off-by: Peter Xu <peterx@xxxxxxxxxx> > --- > include/linux/mm.h | 21 +++++++++++++++++++++ > mm/huge_memory.c | 8 ++------ > mm/internal.h | 5 ----- > mm/memory.c | 8 +------- > 4 files changed, 24 insertions(+), 18 deletions(-) Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Jason
