On Mon, Feb 22, 2021 at 09:11:43PM +0800, Zhengyejian (Zetta) wrote:
On 2021/2/22 20:36, Greg KH wrote:
On Mon, Feb 22, 2021 at 08:20:38PM +0800, Zhengyejian (Zetta) wrote:
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@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 geert@linux-m68k.org Reported-by: Dave Jones davej@codemonkey.org.uk Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Cc: Andrew Morton akpm@linux-foundation.org Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Paul E. McKenney paulmck@us.ibm.com Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Fixes: c1e2f0eaf015 ("futex: Avoid violating the 10th rule of futex") Link: http://lkml.kernel.org/r/20180122103947.GD2228@hirez.programming.kicks-ass.n... Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Zheng Yejian zhengyejian1@huawei.com
kernel/futex.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
Reviewed-by: Lee Jones lee.jones@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 .
I make the patch basing on 282aeb477a10 ("Linux 4.9.257"). Should I base on f0cf73f13b39 ("Linux 4.9.258-rc1")?
Yes please as I think this is already there.
How about just waiting for the next release to come out, I will push out the 4.4 and 4.9 -rc releases right now as well to give everyone a chance to sync up properly.
Ok, I will rebase this patch then.
Great, can you try 4.9.258?
thanks,
greg k-h