linux-kernel - Re: [PATCH 06/14] peci: Add core infrastructure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sat, 17 Jul 2021 08:12:52 +0200
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     "Winiarska, Iwona" <iwona.winiarska@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "corbet@....net" <corbet@....net>,
        "jason.m.bills@...ux.intel.com" <jason.m.bills@...ux.intel.com>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        "jae.hyun.yoo@...ux.intel.com" <jae.hyun.yoo@...ux.intel.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "andrew@...id.au" <andrew@...id.au>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "yazen.ghannam@....com" <yazen.ghannam@....com>,
        "joel@....id.au" <joel@....id.au>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "pierre-louis.bossart@...ux.intel.com" 
        <pierre-louis.bossart@...ux.intel.com>
Subject: Re: [PATCH 06/14] peci: Add core infrastructure

On Fri, Jul 16, 2021 at 02:50:04PM -0700, Dan Williams wrote:
> On Fri, Jul 16, 2021 at 2:08 PM Winiarska, Iwona
> > > > +}
> > > > +EXPORT_SYMBOL_NS_GPL(peci_controller_add, PECI);
> > >
> > > I think it's cleaner to declare symbol namespaces in the Makefile. In
> > > this case, add:
> > >
> > > cflags-y += -DDEFAULT_SYMBOL_NAMESPACE=PECI
> > >
> > > ...and just use EXPORT_SYMBOL_GPL as normal in the C file.
> > >
> >
> > I kind of prefer the more verbose EXPORT_SYMBOL_NS_GPL - it also
> > doesn't "hide" the fact that we're using namespaces (everything is in
> > the C file rather than mixed into Makefile), but it's not a strong
> > opinion, so sure - I can change this.
> >
> 
> Perhaps as a tie breaker, the maintainer you are submitting this to,
> Greg, uses the -DDEFAULT_SYMBOL_NAMESPACE scheme in his subsystem,
> drivers/usb/.

We did that because namespaces were added _after_ the kernel code was
already there.  For new code like this, the original use of
EXPORT_SYMBOL_NS_GPL() is best as it is explicit and obvious.  No need
to dig around in a Makefile to find out the namespace name.

thanks,

greg k-h