From: Greg KH <gregkh@linuxfoundation.org>
To: Xiaoming Ni <nixiaoming@huawei.com>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
sashal@kernel.org, tglx@linutronix.de, lee.jones@linaro.org,
wangle6@huawei.com, zhengyejian1@huawei.com
Subject: Re: [PATCH] futex: fix dead code in attach_to_pi_owner()
Date: Thu, 25 Feb 2021 09:25:37 +0100 [thread overview]
Message-ID: <YDdfASEcv7i/DxHF@kroah.com> (raw)
In-Reply-To: <20210222125352.110124-1-nixiaoming@huawei.com>
On Mon, Feb 22, 2021 at 08:53:52PM +0800, Xiaoming Ni wrote:
> From: Thomas Gleixner <tglx@linutronix.de>
>
> The handle_exit_race() function is defined in commit c158b461306df82
> ("futex: Cure exit race"), which never returns -EBUSY. This results
> in a small piece of dead code in the attach_to_pi_owner() function:
>
> int ret = handle_exit_race(uaddr, uval, p); /* Never return -EBUSY */
> ...
> if (ret == -EBUSY)
> *exiting = p; /* dead code */
>
> The return value -EBUSY is added to handle_exit_race() in upsteam
> commit ac31c7ff8624409 ("futex: Provide distinct return value when
> owner is exiting"). This commit was incorporated into v4.9.255, before
> the function handle_exit_race() was introduced, whitout Modify
> handle_exit_race().
>
> To fix dead code, extract the change of handle_exit_race() from
> commit ac31c7ff8624409 ("futex: Provide distinct return value when owner
> is exiting"), re-incorporated.
>
> Fixes: c158b461306df82 ("futex: Cure exit race")
> Cc: stable@vger.kernel.org # 4.9.258-rc1
> Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
> ---
> kernel/futex.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
What is the git commit id of this patch in Linus's tree?
Also, what kernel tree(s) is this supposed to go to?
thanks,
greg k-h
next prev parent reply other threads:[~2021-02-25 8:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-22 12:53 [PATCH] futex: fix dead code in attach_to_pi_owner() Xiaoming Ni
2021-02-25 8:25 ` Greg KH [this message]
2021-02-25 8:56 ` Xiaoming Ni
2021-02-25 9:31 ` Lee Jones
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