linux-kernel - Re: [RFC PATCH 1/5] proc: intoduce proc_inode->pid_entry and is_tgid_pid

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Message-ID: <20140809142850.GB16457@redhat.com>
Date:	Sat, 9 Aug 2014 16:28:50 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <levinsasha928@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/5] proc: intoduce proc_inode->pid_entry and
	is_tgid_pid_entry()

On 08/09, Cyrill Gorcunov wrote:
>
> On Fri, Aug 08, 2014 at 08:57:47PM +0200, Oleg Nesterov wrote:
> ...
> > +++ b/fs/proc/inode.c
> > @@ -73,6 +73,7 @@ static struct inode *proc_alloc_inode(struct super_block *sb)
> >  	ei->pde = NULL;
> >  	ei->sysctl = NULL;
> >  	ei->sysctl_entry = NULL;
> > +	ei->pid_entry = NULL;
> >  	ei->ns.ns = NULL;
> >  	ei->ns.ns_ops = NULL;
> >  	inode = &ei->vfs_inode;
>
> Hi Oleg, sorry for not responding to previous emails, will try to review this
> things tomorrow (from a glance looks quite good!). Btw, this moment strike my
> eyes -- why don't we use kmem_cache_zalloc here but do assign nils again and
> again, maybe worth to address as well?

Probably because this doesn't make sense to nullify proc_inode->vfs_inode,
it will be reinitialized at least by inode_init_always() anyway.

Oleg.

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