linux-kernel - Re: [PATCH v7 1/3] sysfs: added sysfs_link_entry_to

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Message-ID: <20150622180154.GC3710@mtj.duckdns.org>
Date:	Mon, 22 Jun 2015 14:01:54 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	peterhuewe@....de, gregkh@...uxfoundation.org,
	Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
	Guenter Roeck <linux@...ck-us.net>, NeilBrown <neilb@...e.de>
Subject: Re: [PATCH v7 1/3] sysfs: added sysfs_link_entry_to_kobj()

On Mon, Jun 22, 2015 at 11:52:53AM -0600, Jason Gunthorpe wrote:
> On Mon, Jun 22, 2015 at 01:30:39PM -0400, Tejun Heo wrote:
> > On Mon, Jun 22, 2015 at 08:24:50PM +0300, Jarkko Sakkinen wrote:
> > > Added a new function sysfs_link_group_to_kobj() that adds a symlink
> > > from attribute or group to a kobject. Exported kernfs_remove_by_name_ns
> > > in order to provide a way to remove such symlinks.
> > > 
> > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > 
> > Hmmm... is this *really* necessary?  If linking from the parent kobj
> > doesn't make a fundamental functional difference, I don't think this
> > is a good idea.  If linking to the parent doesn't work, why doesn't
> > it?  Shouldn't that already be a different kobj then?  I'd really like
> > to keep groups as a dumb container of simple attrs.
> 
> TPM is undergoing a migration of core attributes from the
> platform_device to the core's struct device.
> 
> The only purpose of the symlink was to provide userspace
> compatability with the old location.

Ah, yeah, that's painful.  Can you please briefly explain why it
wasn't necessary before?  Are you merging multiple devices into one?

Thanks.

-- 
tejun
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