power: supply: core: move power_supply_attr_group into #ifdef block

When building with CONFIG_SYSFS=n, the build error below is triggered:

ld: drivers/power/supply/power_supply_core.o:(.data+0x0): undefined
reference to `power_supply_attr_group'

The problem is that power_supply_attr_group is needed in
power_supply_core.c but defined in power_supply_sysfs.c, which is only
targeted with CONFIG_SYSFS=y. Therefore, move the extern declaration into
the #ifdef block that checks for CONFIG_SYSFS, and define an empty static
const struct otherwise. This is safe because the macro __ATRIBUTE_GROUPS in
power_supply_core.c will expand into an empty attribute_group array.

Cc: Greg Kroah-Hartman <[email protected]>
Reported-by: Nathan Chancellor <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
Fixes: 7b46b60944d7 ("power: supply: core: constify the struct device_type usage")
Signed-off-by: Ricardo B. Marliere <[email protected]>
Tested-by: Nathan Chancellor <[email protected]> # build
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sebastian Reichel <[email protected]>

0 files changed, 0 insertions, 0 deletions