linux-kernel - Re: [PATCH] ARM: mcpm, perf/arm-cci: export mcpm_is

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Message-ID: <20180529154251.GM17671@n2100.armlinux.org.uk>
Date:   Tue, 29 May 2018 16:42:51 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Will Deacon <will.deacon@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        nicolas.pitre@...aro.org, robin.murphy@....com
Subject: Re: [PATCH] ARM: mcpm, perf/arm-cci: export mcpm_is_available

On Tue, May 29, 2018 at 04:41:20PM +0100, Will Deacon wrote:
> Hi Russell,
> 
> On Tue, May 29, 2018 at 04:33:24PM +0100, Russell King - ARM Linux wrote:
> > On Tue, May 29, 2018 at 04:30:14PM +0100, Will Deacon wrote:
> > > Hi Arnd, Russell, [+Nico and Robin]
> > > 
> > > On Mon, May 28, 2018 at 05:44:36PM +0200, Arnd Bergmann wrote:
> > > > Now that the ARM CCI PMU driver can be built as a loadable module,
> > > > we get a link failure when MCPM is enabled:
> > > > 
> > > > ERROR: "mcpm_is_available" [drivers/perf/arm-cci.ko] undefined!
> > > > 
> > > > The simplest fix is to export that helper function.
> > > > 
> > > > Fixes: 8b0c93c20ef7 ("perf/arm-cci: Allow building as a module")
> > > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > > > ---
> > > > The patch that caused this is currently part of the arm-perf/for-next/perf
> > > > branch, it would be good to have the fix there as well.
> > > > ---
> > > >  arch/arm/common/mcpm_entry.c | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > 
> > > I'm happy to take this via the arm perf tree if others are ok with that.
> > > Alternatively, I can revert the offending commit if there are objections
> > > to exporting the symbol.
> > > 
> > > Russell: do you any preference?
> > 
> > As it claims to fix 8b0c93c20ef7, which I don't have, I can't take this
> > patch.  Do we know which tree has this?
> 
> Yes, sorry, it's in my for-next/perf branch:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/commit/?h=for-next/perf&id=8b0c93c20ef78f15d8b760964ff79bda7f68c610
> 
> which is now in -next.
> 
> I'm happy to take the mcpm patch on top with your ack, but if you have
> conflicting changes (or would prefer not to export the symbol to modules)
> then I can just revert the patch in my tree for now.

I have no changes to that file, so:

Acked-by: Russell King <rmk+kernel@...linux.org.uk>

Thanks.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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