From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Tue, 29 May 2018 16:41:20 +0100 Subject: [PATCH] ARM: mcpm, perf/arm-cci: export mcpm_is_available In-Reply-To: <20180529153324.GL17671@n2100.armlinux.org.uk> References: <20180528154448.2494709-1-arnd@arndb.de> <20180529153013.GH17159@arm.com> <20180529153324.GL17671@n2100.armlinux.org.uk> Message-ID: <20180529154120.GI17159@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > > > --- > > > 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. Will