linux-kernel - Re: [PATCH v4] staging: fsl-mc: move bus driver out of staging

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Date:   Tue, 19 Dec 2017 17:10:45 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     Ruxandra Ioana Radulescu <ruxandra.radulescu@....com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bogdan Purcareata <bogdan.purcareata@....com>,
        Leo Li <leoyang.li@....com>,
        "stuyoder@...il.com" <stuyoder@...il.com>,
        Roy Pledge <roy.pledge@....com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Stuart Yoder <stuart.yoder@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH v4] staging: fsl-mc: move bus driver out of staging

On Tue, Dec 19, 2017 at 03:39:44PM +0000, Laurentiu Tudor wrote:
> On 12/19/2017 05:29 PM, Greg KH wrote:
> > On Tue, Dec 19, 2017 at 03:21:19PM +0000, Laurentiu Tudor wrote:
> >>
> >>
> >> On 12/19/2017 04:48 PM, Greg KH wrote:
> >>> On Wed, Nov 29, 2017 at 12:08:44PM +0200, laurentiu.tudor@....com wrote:
> >>>> From: Stuart Yoder <stuart.yoder@....com>
> >>>>
> >>>> Move the source files out of staging into their final locations:
> >>>>     -include files in drivers/staging/fsl-mc/include go to include/linux/fsl
> >>>>     -irq-gic-v3-its-fsl-mc-msi.c goes to drivers/irqchip
> >>>>     -source in drivers/staging/fsl-mc/bus goes to drivers/bus/fsl-mc
> >>>>     -README.txt, providing and overview of DPAA goes to
> >>>>      Documentation/dpaa2/overview.txt
> >>>>
> >>>> Update or delete other remaining staging files-- Makefile, Kconfig, TODO.
> >>>> Update dpaa2_eth and dpio staging drivers.
> >>>>
> >>>> Signed-off-by: Stuart Yoder <stuyoder@...il.com>
> >>>> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
> >>>> [Laurentiu: rebased, add dpaa2_eth and dpio #include updates]
> >>>> Cc: Thomas Gleixner <tglx@...utronix.de>
> >>>> Cc: Jason Cooper <jason@...edaemon.net>
> >>>> Cc: Marc Zyngier <marc.zyngier@....com>
> >>>> ---
> >>>> Notes:
> >>>>       -v4:
> >>>>         - regenerated patch with renames detection disabled (Andrew Lunn)
> >>>>       -v3:
> >>>>         - rebased
> >>>
> >>> Ok, meta-comments on the structure of the code.
> >>>
> >>> You have 8 .h files that are "private" to your bus logic.  That's 7 too
> >>> many, some of them have a bigger license header than actual content :)
> >>>
> >>> Please consolidate into 1.
> >>>
> >>> Also, the headers should be moved to SPDX format to get rid of the
> >>> boilerplate.  I _think_ it's BSD/GPL, right?  Hard to tell :(
> >>
> >> It's 3-clause BSD and GPLv2. Will make it clear when moving to SPDX.
> >
> > Thanks.
> >
> >>> Your "public" .h file does not need to go into a subdirectory, just name
> >>> it fsl-mc.h and put it in include/linux/.
> >>
> >> There's already a "fsl" subdirectory in include/linux/ so it seemed to
> >> make sense to use it.
> >
> > Ah, missed that.  Ok, nevermind :)`
> >
> >>> One comment on the fields in your .h file, all of the user/kernel
> >>> crossing boundry structures need to use the "__" variant of types, like
> >>> "__u8" and the like.  You mix and match them for some reason, you need
> >>> to be consistent.
> >>>
> >>> Also, what's up with the .h files in drivers/staging/fsl-bus/include?
> >>> You didn't touch those with this movement, right?  Why?
> >>
> >> Those are not part of the bus "core". Some of them are part of the DPBP
> >> and DPCON device types APIs and are used by drivers probing on this bus
> >> and the rest are part of the DPIO driver which is also used by other
> >> drivers. Since these devices (DPBP, DPCON, DPIO) are interfaces used by
> >> all the other drivers it made sense to group them together with the bus.
> >
> > But all of these .h files are only used by the code in this specific
> > directory, no where else.
> 
> They are also used by our ethernet driver, see:
>    drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h

Ick, really?  Then they should not be buried in a bus-specific
location, but rather be in include/linux/SOMEWHERE, right?

thanks,

greg k-h