linux-kernel - Re: [PATCH v2] devres: keep both device name and resource name in pretty name

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Date:   Mon, 1 Jun 2020 11:48:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        bgolaszewski@...libre.com, mika.westerberg@...ux.intel.com,
        efremov@...ux.com, ztuowen@...il.com,
        lkml <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] devres: keep both device name and resource name in
 pretty name

On Mon, Jun 01, 2020 at 12:36:08PM +0300, Vladimir Oltean wrote:
> Hi Sergei,
> 
> On Mon, 1 Jun 2020 at 10:51, Sergei Shtylyov
> <sergei.shtylyov@...entembedded.com> wrote:
> >
> > Hello!
> >
> > On 31.05.2020 21:07, Vladimir Oltean wrote:
> >
> > > From: Vladimir Oltean <vladimir.oltean@....com>
> > >
> > > Sometimes debugging a device is easiest using devmem on its register
> > > map, and that can be seen with /proc/iomem. But some device drivers have
> > > many memory regions. Take for example a networking switch. Its memory
> > > map used to look like this in /proc/iomem:
> > >
> > > 1fc000000-1fc3fffff : pcie@...000000
> > >    1fc000000-1fc3fffff : 0000:00:00.5
> > >      1fc010000-1fc01ffff : sys
> > >      1fc030000-1fc03ffff : rew
> > >      1fc060000-1fc0603ff : s2
> > >      1fc070000-1fc0701ff : devcpu_gcb
> > >      1fc080000-1fc0800ff : qs
> > >      1fc090000-1fc0900cb : ptp
> > >      1fc100000-1fc10ffff : port0
> > >      1fc110000-1fc11ffff : port1
> > >      1fc120000-1fc12ffff : port2
> > >      1fc130000-1fc13ffff : port3
> > >      1fc140000-1fc14ffff : port4
> > >      1fc150000-1fc15ffff : port5
> > >      1fc200000-1fc21ffff : qsys
> > >      1fc280000-1fc28ffff : ana
> > >
> > > But after the patch in Fixes: was applied, the information is now
> > > presented in a much more opaque way:
> > >
> > > 1fc000000-1fc3fffff : pcie@...000000
> > >    1fc000000-1fc3fffff : 0000:00:00.5
> > >      1fc010000-1fc01ffff : 0000:00:00.5
> > >      1fc030000-1fc03ffff : 0000:00:00.5
> > >      1fc060000-1fc0603ff : 0000:00:00.5
> > >      1fc070000-1fc0701ff : 0000:00:00.5
> > >      1fc080000-1fc0800ff : 0000:00:00.5
> > >      1fc090000-1fc0900cb : 0000:00:00.5
> > >      1fc100000-1fc10ffff : 0000:00:00.5
> > >      1fc110000-1fc11ffff : 0000:00:00.5
> > >      1fc120000-1fc12ffff : 0000:00:00.5
> > >      1fc130000-1fc13ffff : 0000:00:00.5
> > >      1fc140000-1fc14ffff : 0000:00:00.5
> > >      1fc150000-1fc15ffff : 0000:00:00.5
> > >      1fc200000-1fc21ffff : 0000:00:00.5
> > >      1fc280000-1fc28ffff : 0000:00:00.5
> > >
> > > That patch made a fair comment that /proc/iomem might be confusing when
> > > it shows resources without an associated device, but we can do better
> > > than just hide the resource name altogether. Namely, we can print the
> > > device name _and_ the resource name. Like this:
> > >
> > > 1fc000000-1fc3fffff : pcie@...000000
> > >    1fc000000-1fc3fffff : 0000:00:00.5
> > >      1fc010000-1fc01ffff : 0000:00:00.5 sys
> > >      1fc030000-1fc03ffff : 0000:00:00.5 rew
> > >      1fc060000-1fc0603ff : 0000:00:00.5 s2
> > >      1fc070000-1fc0701ff : 0000:00:00.5 devcpu_gcb
> > >      1fc080000-1fc0800ff : 0000:00:00.5 qs
> > >      1fc090000-1fc0900cb : 0000:00:00.5 ptp
> > >      1fc100000-1fc10ffff : 0000:00:00.5 port0
> > >      1fc110000-1fc11ffff : 0000:00:00.5 port1
> > >      1fc120000-1fc12ffff : 0000:00:00.5 port2
> > >      1fc130000-1fc13ffff : 0000:00:00.5 port3
> > >      1fc140000-1fc14ffff : 0000:00:00.5 port4
> > >      1fc150000-1fc15ffff : 0000:00:00.5 port5
> > >      1fc200000-1fc21ffff : 0000:00:00.5 qsys
> > >      1fc280000-1fc28ffff : 0000:00:00.5 ana
> > >
> > > Fixes: 8d84b18f5678 ("devres: always use dev_name() in devm_ioremap_resource()")
> > > Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> > [...]
> >
> >     You didn't write the version log -- what changed since v1?
> >
> > MBR, Sergei
> 
> The changes in v2 are that I'm checking for memory allocation errors.

You always need to mention that below the --- line, as the
documentation says to.

Please send a v3 with that fixed up.

thanks,

greg k-h