linux-kernel - Re: [GIT PULL] Disintegrate and kill asm/system.h

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Message-Id: <20120330214617.B97523E04A4@localhost>
Date:	Fri, 30 Mar 2012 15:46:17 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Paul Mundt <lethal@...ux-sh.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Michael Neuling <mikey@...ling.org>,
	David Howells <dhowells@...hat.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	paul.gortmaker@...driver.com, arnd@...db.de, hpa@...or.com,
	sfr@...b.auug.org.au
Subject: Re: [GIT PULL] Disintegrate and kill asm/system.h

On Fri, 30 Mar 2012 16:48:52 +0900, Paul Mundt <lethal@...ux-sh.org> wrote:
> On Thu, Mar 29, 2012 at 03:14:29PM +1100, Benjamin Herrenschmidt wrote:
> > > We are currently getting:
> > > kernel/irq/irqdomain.c: In function 'irq_debugfs_init':
> > > kernel/irq/irqdomain.c:698:63: error: 'powerpc_debugfs_root' undeclared (first use in this function)
> > > kernel/irq/irqdomain.c:698:63: note: each undeclared identifier is reported only once for each function it appears in
> > > 
> > >   ae3a197 Disintegrate asm/system.h for PowerPC
> > > is conflicting with 
> > >   cc79ca6 irq_domain: Move irq_domain code from powerpc to kernel/irq
> > > from Grant's tree.
> > > 
> > > Adding the following patch fixes it for pseries_defconfig, although I'm
> > > not sure it's the right fix.
> > 
> > That will do as a quick fix (Linus, can you take it now ?), however..
> > 
> > > Grant: why does powerpc_debugfs_root appear in generic code?  This seems
> > > very bogus.
> > 
> > Yes, Grant, you should move that to a different (generic) debugfs file,
> > the mapping information is valuable debug data for all architectures
> > that use the remapper, not just powerpc and it's not an ABI (no tool I
> > know of rely on the location of that debugfs file) so feel free to move
> > it around.
> > 
> There is a arch_debugfs_dir defined by linux/debugfs.h, but at the moment
> it's only provided by x86 and sh.

Since this data can be used by any arch now, it doesn't make much
sense to put it in arch_debugfs_dir.  I've put it in
/debug/irq_domain_mapping which should be fine.

g.


-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.
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