On Mon, Feb 22, 2021 at 11:54:24AM +0000, Lee Jones wrote:
> On Mon, 22 Feb 2021, Zheng Yejian wrote:
>
> > From: Peter Zijlstra <pet...@infradead.org>
> >
> > 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 <ge...@linux-m68k.org>
> > Reported-by: Dave Jones <da...@codemonkey.org.uk>
> > Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
> > Cc: Andrew Morton <a...@linux-foundation.org>
> > Cc: Linus Torvalds <torva...@linux-foundation.org>
> > Cc: Paul E. McKenney <paul...@us.ibm.com>
> > Cc: Peter Zijlstra <pet...@infradead.org>
> > Cc: Thomas Gleixner <t...@linutronix.de>
> > Fixes: c1e2f0eaf015 ("futex: Avoid violating the 10th rule of futex")
> > Link:
> > http://lkml.kernel.org/r/20180122103947.gd2...@hirez.programming.kicks-ass.net
> > Signed-off-by: Ingo Molnar <mi...@kernel.org>
> > Signed-off-by: Zheng Yejian <zhengyeji...@huawei.com>
> > ---
> > kernel/futex.c | 7 +++----
> > 1 file changed, 3 insertions(+), 4 deletions(-)
>
> Reviewed-by: Lee Jones <lee.jo...@linaro.org>
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
