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

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@decadent.org.uk

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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