linux-kernel - Re: of/dynamic: Fix test for PPC

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Date:	Fri, 05 Jun 2015 10:44:48 +0900
From:	Grant Likely <grant.likely@...aro.org>
To:	Michael Ellerman <mpe@...erman.id.au>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Rob Herring <robh+dt@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	nfont@...ux.vnet.ibm.com
Subject: Re: of/dynamic: Fix test for PPC_PSERIES

On Thu,  4 Jun 2015 20:57:32 +1000 (AEST)
, Michael Ellerman <mpe@...erman.id.au>
 wrote:
> On Thu, 2015-04-06 at 09:34:41 UTC, Geert Uytterhoeven wrote:
> > "IS_ENABLED(PPC_PSERIES)" always evaluates to false, as IS_ENABLED() is
> > supposed to be used with the full Kconfig symbol name, including the
> > "CONFIG_" prefix.
> > 
> > Add the missing "CONFIG_" prefix to fix this.
> > 
> > Fixes: a25095d451ece23b ("of: Move dynamic node fixups out of powerpc and into common code")
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > ---
> 
> > Did this bug cause any breakage?
> > If yes, the fix should go to stable (for v3.17 and later).
> 
> Yikes. Not that I've heard of. But it's reasonably new so possibly it's not hit
> distros that folks tend to run on those machines.
> 
> I'm also not clear how it would break, it could be subtle and we've not noticed.
> 
> Nathan might have more of an idea (on CC).
> 
> On my machine here everything that has an ibm,phandle also has a linux,phandle,
> so we wouldn't hit that code path. But I'm not sure how representative that box
> is.
> 
> cheers

Still, an obvious bug. I've picked it up and marked for stable.

g.


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