linux-kernel - Re: [PATCH] futex: fix dead code in attach_to_pi

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Date:   Thu, 25 Feb 2021 09:25:37 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Xiaoming Ni <nixiaoming@...wei.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        sashal@...nel.org, tglx@...utronix.de, lee.jones@...aro.org,
        wangle6@...wei.com, zhengyejian1@...wei.com
Subject: Re: [PATCH] futex: fix dead code in attach_to_pi_owner()

On Mon, Feb 22, 2021 at 08:53:52PM +0800, Xiaoming Ni wrote:
> From: Thomas Gleixner <tglx@...utronix.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@...r.kernel.org # 4.9.258-rc1
> Signed-off-by: Xiaoming Ni <nixiaoming@...wei.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