Subject: Re: linux-next: manual merge of the pidfd tree with Linus' tree

From: Stephen Rothwell <[email-masked]>
Date: Tue, 9 Jul 2019 10:19:57 +1000

Hi all,

On Mon, 1 Jul 2019 20:35:13 +1000 Stephen Rothwell <[email-masked]> wrote:
>
> Today's linux-next merge of the pidfd tree got a conflict in:
> 
>   kernel/fork.c
> 
> between commits:
> 
>   9014143bab2f ("fork: don't check parent_tidptr with CLONE_PIDFD")
>   6fd2fe494b17 ("copy_process(): don't use ksys_close() on cleanups")
> 
> from Linus' tree and commit:
> 
>   7f192e3cd316 ("fork: add clone3")
> 
> from the pidfd tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> -- 
> Cheers,
> Stephen Rothwell
> 
> diff --cc kernel/fork.c
> index 947bc0161f9c,4114a044822c..000000000000
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@@ -1755,7 -1794,7 +1776,8 @@@ static __latent_entropy struct task_str
>   	int pidfd = -1, retval;
>   	struct task_struct *p;
>   	struct multiprocess_signals delayed;
>  +	struct file *pidfile = NULL;
> + 	u64 clone_flags = args->flags;
>   
>   	/*
>   	 * Don't allow sharing the root directory with processes in a different
> @@@ -2030,16 -2070,7 +2050,16 @@@
>   			goto bad_fork_free_pid;
>   
>   		pidfd = retval;
>  +
>  +		pidfile = anon_inode_getfile("[pidfd]", &pidfd_fops, pid,
>  +					      O_RDWR | O_CLOEXEC);
>  +		if (IS_ERR(pidfile)) {
>  +			put_unused_fd(pidfd);
>  +			goto bad_fork_free_pid;
>  +		}
>  +		get_pid(pid);	/* held by pidfile now */
>  +
> - 		retval = put_user(pidfd, parent_tidptr);
> + 		retval = put_user(pidfd, args->pidfd);
>   		if (retval)
>   			goto bad_fork_put_pidfd;
>   	}

I am still getting this conflict (the commit ids may have changed).
Just a reminder in case you think Linus may need to know.

-- 
Cheers,
Stephen Rothwell