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SubjectRe: linux-next: build failure after merge of the pm tree
On Mon, Jul 11, 2016 at 11:46:53AM +1000, Stephen Rothwell wrote:
> Hi Rafael,
>
> After merging the pm tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
>
> ERROR: "configfs_unregister_subsystem" [samples/configfs/configfs_sample.ko] undefined!
> ERROR: "configfs_register_subsystem" [samples/configfs/configfs_sample.ko] undefined!
> ERROR: "config_group_init" [samples/configfs/configfs_sample.ko] undefined!
> ERROR: "config_item_init_type_name" [samples/configfs/configfs_sample.ko] undefined!
> ERROR: "config_group_init_type_name" [samples/configfs/configfs_sample.ko] undefined!
> ERROR: "configfs_undepend_item" [fs/ocfs2/cluster/ocfs2_nodemanager.ko] undefined!
> ERROR: "config_item_put" [fs/ocfs2/cluster/ocfs2_nodemanager.ko] undefined!
> ERROR: "config_item_init_type_name" [fs/ocfs2/cluster/ocfs2_nodemanager.ko] undefined!
>
> ... and many more ...
>
> Presumably (maybe?) caused by commit
>
> 0bf54fcd9504 ("ACPI: add support for configfs")
>
> though it is not obvious why this should be a problem.

Looks like it is the module name (configfs.o) that confuses modpost or
linker. The below patch fixes it for me.

From: Mika Westerberg <mika.westerberg@linux.intel.com>
Subject: [PATCH] ACPI: Rename configfs.c to acpi_configfs.c to prevent link error

If we compile ACPI configfs.c as module it will confuse the linker as it
hides symbols from the actual configfs:

Kernel: arch/x86/boot/bzImage is ready (#1236)
MODPOST 5739 modules
ERROR: "configfs_unregister_subsystem" [samples/configfs/configfs_sample.ko] undefined!
ERROR: "configfs_register_subsystem" [samples/configfs/configfs_sample.ko] undefined!
ERROR: "config_group_init" [samples/configfs/configfs_sample.ko] undefined!
ERROR: "config_item_init_type_name" [samples/configfs/configfs_sample.ko] undefined!
ERROR: "config_group_init_type_name" [samples/configfs/configfs_sample.ko] undefined!
ERROR: "configfs_undepend_item" [fs/ocfs2/cluster/ocfs2_nodemanager.ko] undefined!
...

Prevent these by renaming the file to acpi_configfs.c instead.

Reported-by: Scott Lawson <scott.lawson@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
drivers/acpi/Makefile | 2 +-
drivers/acpi/{configfs.c => acpi_configfs.c} | 0
2 files changed, 1 insertion(+), 1 deletion(-)
rename drivers/acpi/{configfs.c => acpi_configfs.c} (100%)

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 1dc2173ad8d0..f72a83df1cf3 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -99,6 +99,6 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o
obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o
obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o
-obj-$(CONFIG_ACPI_CONFIGFS) += configfs.o
+obj-$(CONFIG_ACPI_CONFIGFS) += acpi_configfs.o

video-objs += acpi_video.o video_detect.o
diff --git a/drivers/acpi/configfs.c b/drivers/acpi/acpi_configfs.c
similarity index 100%
rename from drivers/acpi/configfs.c
rename to drivers/acpi/acpi_configfs.c
--
2.8.1
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