Re: [PATCH 4.9.257 1/1] futex: Fix OWNER_DEAD fixup

[Zhengyejian (Zetta)]

On 2021/2/22 20:07, Greg KH wrote:
> On Mon, Feb 22, 2021 at 11:54:24AM +0000, Lee Jones wrote:
> > On Mon, 22 Feb 2021, Zheng Yejian wrote:
> >
> > > From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> > >
> > > commit a97cb0e7b3f4c6297fd857055ae8e895f402f501 upstream.
> > >
> > > Both Geert and DaveJ reported that the recent futex commit:
> > >
> > >    c1e2f0eaf015 ("futex: Avoid violating the 10th rule of futex")
> > >
> > > introduced a problem with setting OWNER_DEAD. We set the bit on an
> > > uninitialized variable and then entirely optimize it away as a
> > > dead-store.
> > >
> > > Move the setting of the bit to where it is more useful.
> > >
> > > Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> > > Reported-by: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
> > > Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> > > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> > > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> > > Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
> > > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> > > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > > Fixes: c1e2f0eaf015 ("futex: Avoid violating the 10th rule of futex")
> > > Link: http://lkml.kernel.org/r/20180122103947.GD2228@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > > Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
> > > Signed-off-by: Zheng Yejian <zhengyejian1@xxxxxxxxxx>
> > > ---
> > >   kernel/futex.c | 7 +++----
> > >   1 file changed, 3 insertions(+), 4 deletions(-)
> >
> > Reviewed-by: Lee Jones <lee.jones@xxxxxxxxxx>
>
> This does not apply to the 4.9.y tree at all right now, are you all sure
> you got the backport correct?
>
> confused,
>
> greg k-h
> .
I make the patch basing on 282aeb477a10 ("Linux 4.9.257").
Should I base on f0cf73f13b39 ("Linux 4.9.258-rc1")?