On Mon, 22 Feb 2021, Zheng Yejian wrote: > From: Peter Zijlstra <[email protected]> > > 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 <[email protected]> > Reported-by: Dave Jones <[email protected]> > Signed-off-by: Peter Zijlstra (Intel) <[email protected]> > Cc: Andrew Morton <[email protected]> > Cc: Linus Torvalds <[email protected]> > Cc: Paul E. McKenney <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Fixes: c1e2f0eaf015 ("futex: Avoid violating the 10th rule of futex") > Link: > http://lkml.kernel.org/r/[email protected] > Signed-off-by: Ingo Molnar <[email protected]> > Signed-off-by: Zheng Yejian <[email protected]> > --- > kernel/futex.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-)
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