Re: [PATCH 0/5] 4.14 backports of fixes for "CoW after fork() issue"

[Suren Baghdasaryan]

On Wed, Apr 21, 2021 at 2:17 PM Suren Baghdasaryan <surenb@xxxxxxxxxx> wrote:
>
> On Wed, Apr 21, 2021 at 2:05 PM Peter Xu <peterx@xxxxxxxxxx> wrote:
> >
> > Hi, Suren,
> >
> > On Wed, Apr 21, 2021 at 01:01:34PM -0700, Suren Baghdasaryan wrote:
> > > Peter, you mentioned https://lkml.org/lkml/2020/8/10/439 patch to
> > > distinguish real writes vs enforced COW read requests, however I also
> > > see that you had a later version of this patch here:
> > > https://lore.kernel.org/patchwork/patch/1286506/. Which one should I
> > > backport? Or is it not needed in the absence of uffd-wp support in the
> > > earlier kernels?
> >
> > Sorry I have no ability to evaluate the rest... but according to Linus's
> > previous reply, my understanding is that it is not needed, not to mention it's
> > not upstreamed too.
>
> Thanks! Then I'll send the backports for 17839856fd58 alone and if
> more backports are needed I'll post followup patches.

Posted 4.19 backport: https://lore.kernel.org/patchwork/patch/1416747
and 4.14 backport: https://lore.kernel.org/patchwork/patch/1416748.
They are identical but Greg asked me to submit separate patches due to
an additional minor merge conflict in 4.14.

> Cheers,
> Suren.
>
> >
> > Thanks,
> >
> > --
> > Peter Xu
> >
> > --
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> >