Re: ERROR: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!

[Randy Dunlap]

On 11/17/21 11:09 AM, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   ee1703cda8dc777e937dec172da55beaf1a74919
> commit: 2bdd5238e756aac3ecbffc7c22b884485e84062e PCI: mt7621: Add MediaTek MT7621 PCIe host controller driver
> date:   4 weeks ago
> config: mips-allmodconfig (attached as .config)
> compiler: mips-linux-gcc (GCC) 11.2.0
> reproduce (this is a W=1 build):
>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>          chmod +x ~/bin/make.cross
>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2bdd5238e756aac3ecbffc7c22b884485e84062e
>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>          git fetch --no-tags linus master
>          git checkout 2bdd5238e756aac3ecbffc7c22b884485e84062e
>          # save the attached .config to linux build tree
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=mips
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
> All errors (new ones prefixed by >>, old ones prefixed by <<):
>
> ERROR: modpost: missing MODULE_LICENSE() in drivers/pci/controller/pcie-mt7621.o
> > > ERROR: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > > ERROR: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > > ERROR: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > > ERROR: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > > ERROR: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!


This is one way to fix these build errors. Is that what the MIPS people
want to do or should their be APIs to access these base addresses and
mips_cm_is64 data?

---
From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Subject: [PATCH] mips: kernel: export mips-cm and mips-cpc data & functions for pcie-mt7621

Fixes these build errors:

ERROR: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!
ERROR: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!
ERROR: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!
ERROR: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!
ERROR: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Cc: Paul Burton <paulburton@xxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
---
 arch/mips/kernel/mips-cm.c  |    6 ++++++
 arch/mips/kernel/mips-cpc.c |    2 ++
 2 files changed, 8 insertions(+)

--- linux-next-20211118.orig/arch/mips/kernel/mips-cm.c
+++ linux-next-20211118/arch/mips/kernel/mips-cm.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/errno.h>
+#include <linux/export.h>
 #include <linux/percpu.h>
 #include <linux/spinlock.h>
 
@@ -12,8 +13,11 @@
 #include <asm/mipsregs.h>
 
 void __iomem *mips_gcr_base;
+EXPORT_SYMBOL(mips_gcr_base);
+
 void __iomem *mips_cm_l2sync_base;
 int mips_cm_is64;
+EXPORT_SYMBOL(mips_cm_is64);
 
 static char *cm2_tr[8] = {
 	"mem",	"gcr",	"gic",	"mmio",
@@ -352,6 +356,7 @@ void mips_cm_lock_other(unsigned int clu
 	 */
 	mb();
 }
+EXPORT_SYMBOL(mips_cm_lock_other);
 
 void mips_cm_unlock_other(void)
 {
@@ -368,6 +373,7 @@ void mips_cm_unlock_other(void)
 
 	preempt_enable();
 }
+EXPORT_SYMBOL(mips_cm_unlock_other);
 
 void mips_cm_error_report(void)
 {
--- linux-next-20211118.orig/arch/mips/kernel/mips-cpc.c
+++ linux-next-20211118/arch/mips/kernel/mips-cpc.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/errno.h>
+#include <linux/export.h>
 #include <linux/percpu.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
@@ -13,6 +14,7 @@
 #include <asm/mips-cps.h>
 
 void __iomem *mips_cpc_base;
+EXPORT_SYMBOL(mips_cpc_base);
 
 static DEFINE_PER_CPU_ALIGNED(spinlock_t, cpc_core_lock);