linux-kernel - Re: [PATCH 0/2] Remove support for deprecated %pf and %pF in vsprintf

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Message-ID: <20190324211008.lypghym3gqcp62th@mara.localdomain>
Date:   Sun, 24 Mar 2019 23:10:08 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Petr Mladek <pmladek@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        scsi <linux-scsi@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        linux-um@...ts.infradead.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-block@...r.kernel.org,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        xen-devel@...ts.xenproject.org,
        ceph-devel <ceph-devel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Lars Ellenberg <drbd-dev@...ts.linbit.com>
Subject: Re: [PATCH 0/2] Remove support for deprecated %pf and %pF in vsprintf

Hi Andy,

On Fri, Mar 22, 2019 at 07:05:50PM +0200, Andy Shevchenko wrote:
> On Fri, Mar 22, 2019 at 03:53:50PM +0200, Sakari Ailus wrote:
> 
> > Porting a patch
> > forward should have no issues either as checkpatch.pl has been complaining
> > of the use of %pf and %pF for a while now.
> 
> And that's exactly the reason why I think instead of removing warning on
> checkpatch, it makes sense to convert to an error for a while. People are
> tending read documentation on internet and thus might have outdated one. And
> yes, the compiler doesn't tell a thing about it.
> 
> P.S. Though, if majority of people will tell that I'm wrong, then it's okay to
> remove.

I wonder if you wrote this before seeing my other patchset.

For others as the background, it adds %pfw to print fwnode node names.
Assuming this would be merged, %pfw could be in use relatively soon. With
the current patchset, %pf prints nothing just as %pO ("F" missing).

What I think could be done is to warn of plain %pf (without following "w")
in checkpatch.pl, and %pf that is not followed by "w" in the kernel.
Although we didn't have such checks to begin with. The case is still a
little bit different as %pf used to be a valid conversion specifier whereas
%pO likely has never existed.

So, how about adding such checks in the other set? I can retain %p[fF] check
here, too, if you like.

-- 
Kind regards,

Sakari Ailus
sakari.ailus@...ux.intel.com