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SubjectRe: [PATCH v4 3/5] mm: Introduce page_needs_cow_for_dma() for deciding whether cow
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@redhat.com>
> ---
> 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@nvidia.com>

Jason

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