Re: [PATCH 4.14,4.19] mips,s390,sh,sparc: gup: Work around the "COW can break either way" issue

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On Mon, Jan 24, 2022 at 04:11:18PM +0100, Ben Hutchings wrote:
> In Linux 4.14 and 4.19 these architectures still have their own
> implementations of get_user_pages_fast().  These also need to force
> the write flag on when taking the fast path.
> 
> Fixes: 407faed92b4a ("gup: document and work around "COW can break either way" issue")
> Fixes: 5e24029791e8 ("gup: document and work around "COW can break either way" issue")
> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
> ---
>  arch/mips/mm/gup.c  | 9 ++++++++-
>  arch/s390/mm/gup.c  | 9 ++++++++-
>  arch/sh/mm/gup.c    | 9 ++++++++-
>  arch/sparc/mm/gup.c | 9 ++++++++-
>  4 files changed, 32 insertions(+), 4 deletions(-)

Thanks, now queued up.

greg k-h



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