linux-kernel - Re: [PATCH v3 10/11] RFC: usb-storage: export symbols in USB

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Message-ID: <20190821231329.GA369@infradead.org>
Date:   Wed, 21 Aug 2019 16:13:29 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthias Maennich <maennich@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        arnd@...db.de, geert@...ux-m68k.org, gregkh@...uxfoundation.org,
        hpa@...or.com, jeyu@...nel.org, joel@...lfernandes.org,
        kstewart@...uxfoundation.org, linux-arch@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-modules@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-usb@...r.kernel.org, lucas.de.marchi@...il.com,
        maco@...roid.com, maco@...gle.com, michal.lkml@...kovi.net,
        mingo@...hat.com, oneukum@...e.com, pombredanne@...b.com,
        sam@...nborg.org, sspatil@...gle.com, stern@...land.harvard.edu,
        tglx@...utronix.de, usb-storage@...ts.one-eyed-alien.net,
        x86@...nel.org, yamada.masahiro@...ionext.com
Subject: Re: [PATCH v3 10/11] RFC: usb-storage: export symbols in USB_STORAGE
 namespace

On Wed, Aug 21, 2019 at 12:49:25PM +0100, Matthias Maennich wrote:
> Modules using these symbols are required to explicitly import the
> namespace. This patch was generated with the following steps and serves
> as a reference to use the symbol namespace feature:
> 
>  1) Define DEFAULT_SYMBOL_NAMESPACE in the corresponding Makefile
>  2) make  (see warnings during modpost about missing imports)
>  3) make nsdeps
> 
> Instead of a DEFAULT_SYMBOL_NAMESPACE definition, the EXPORT_SYMBOL_NS
> variants can be used to explicitly specify the namespace. The advantage
> of the method used here is that newly added symbols are automatically
> exported and existing ones are exported without touching their
> respective EXPORT_SYMBOL macro expansion.

So what is USB_STORAGE here?  It isn't a C string, so where does it
come from?  To me using a C string would seem like the nicer interface
vs a random cpp symbol that gets injected somewhere.