From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: Petr Mladek <pmladek@suse.com>
Cc: linux-kernel@vger.kernel.org, rafael@kernel.org,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-acpi@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH 5/5] lib/vsprintf: Add %pfw conversion specifier for printing fwnode names
Date: Wed, 27 Mar 2019 16:10:48 +0200 [thread overview]
Message-ID: <20190327141047.bhndwqde7vjz6bad@paasikivi.fi.intel.com> (raw)
In-Reply-To: <20190326151307.erqyps6wfvf4on2d@pathway.suse.cz>
Hi Petr,
On Tue, Mar 26, 2019 at 04:13:07PM +0100, Petr Mladek wrote:
> On Fri 2019-03-22 17:29:30, Sakari Ailus wrote:
> > Add support for %pfw conversion specifier (with "f" and "P" modifiers) to
> > support printing full path of the node, including its name ("f") and only
> > the node's name ("P") in the printk family of functions. The two flags
> > have equivalent functionality to existing %pOF with the same two modifiers
> > ("f" and "P") on OF based systems. The ability to do the same on ACPI
> > based systems is added by this patch.
> >
> > On ACPI based systems the resulting strings look like
> >
> > \_SB.PCI0.CIO2.port@1.endpoint@0
> >
> > where the nodes are separated by a dot (".") and the first three are
> > ACPI device nodes and the latter two ACPI data nodes.
> >
> > Depends-on: ("vsprintf: Remove support for %pF and %pf in favour of %pS and %ps")
>
> Reusing obsolete modifiers is dangerous from many reasons:
>
> + people might miss the change of the meaning
> + backporting mistakes
> + 3rd party modules
>
> It might be acceptable if the long term gain is bigger
> than a short time difficulties. But it would be better
> to it a safe way when possible.
>
> Fortunately, we could keep the backward compatibility
> for "%pf" and handle only "%pfw*" with the fwnode api.
The v2 of this patch produces a warning (using WARN_ONCE()) for "%pf" not
immediately followed by "w". "%pfw" was not a valid conversion specifier
before this set, so we're actually not re-using the exactly same conversion
specifiers.
--
Regards,
Sakari Ailus
sakari.ailus@linux.intel.com
next prev parent reply other threads:[~2019-03-27 14:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 15:29 [PATCH 0/5] Device property improvements, add %pfw format specifier Sakari Ailus
2019-03-22 15:29 ` [PATCH 1/5] device property: Add functions for accessing node's parents Sakari Ailus
2019-03-22 15:29 ` [PATCH 2/5] device property: Add fwnode_get_name for returning the name of a node Sakari Ailus
2019-03-24 17:21 ` Randy Dunlap
2019-03-24 18:19 ` Sakari Ailus
2019-03-22 15:29 ` [PATCH 3/5] device property: Add a function to obtain a node's prefix Sakari Ailus
2019-03-22 15:29 ` [PATCH 4/5] lib/vsprintf: Make use of fwnode API to obtain node names and separators Sakari Ailus
2019-03-27 12:53 ` Petr Mladek
2019-03-27 13:49 ` Sakari Ailus
2019-03-22 15:29 ` [PATCH 5/5] lib/vsprintf: Add %pfw conversion specifier for printing fwnode names Sakari Ailus
2019-03-22 17:21 ` Andy Shevchenko
2019-03-24 18:17 ` Sakari Ailus
2019-03-26 13:13 ` Andy Shevchenko
2019-03-26 13:39 ` Sakari Ailus
2019-03-26 13:55 ` Andy Shevchenko
2019-03-26 14:09 ` Sakari Ailus
2019-03-26 15:21 ` Petr Mladek
2019-03-26 14:06 ` Heikki Krogerus
2019-03-26 14:12 ` Sakari Ailus
2019-03-26 14:30 ` Andy Shevchenko
2019-03-26 15:50 ` Petr Mladek
2019-03-26 14:30 ` Heikki Krogerus
2019-03-26 15:13 ` Petr Mladek
2019-03-27 14:10 ` Sakari Ailus [this message]
2019-03-28 14:35 ` Petr Mladek
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