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    SubjectRe: [PATCH v2 09/33] kmsan: Introduce kmsan_memmove_metadata()
    On Tue, Nov 21, 2023 at 11:07 PM Ilya Leoshkevich <iii@linux.ibm.com> wrote:
    >
    > It is useful to manually copy metadata in order to describe the effects
    > of memmove()-like logic in uninstrumented code or inline asm. Introduce
    > kmsan_memmove_metadata() for this purpose.
    >
    > Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
    > ---
    > include/linux/kmsan-checks.h | 14 ++++++++++++++
    > mm/kmsan/hooks.c | 11 +++++++++++
    > 2 files changed, 25 insertions(+)
    >
    > diff --git a/include/linux/kmsan-checks.h b/include/linux/kmsan-checks.h
    > index c4cae333deec..5218973f0ad0 100644
    > --- a/include/linux/kmsan-checks.h
    > +++ b/include/linux/kmsan-checks.h
    > @@ -61,6 +61,17 @@ void kmsan_check_memory(const void *address, size_t size);
    > void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy,
    > size_t left);
    >
    > +/**
    > + * kmsan_memmove_metadata() - Copy kernel memory range metadata.
    > + * @dst: start of the destination kernel memory range.
    > + * @src: start of the source kernel memory range.
    > + * @n: size of the memory ranges.
    > + *
    > + * KMSAN will treat the destination range as if its contents were memmove()d
    > + * from the source range.
    > + */
    > +void kmsan_memmove_metadata(void *dst, const void *src, size_t n);

    As noted in patch 18/33, I am pretty sure we shouldn't need this function.

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