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Commitea0212f40c(power: auto select CONFIG_SRCU) made the code in drivers/base/power/wakeup.c use SRCU instead of RCU, but it forgot to select CONFIG_SRCU in Kconfig, which leads to the following build error if CONFIG_SRCU is not selected somewhere else: drivers/built-in.o: In function `wakeup_source_remove': (.text+0x3c6fc): undefined reference to `synchronize_srcu' drivers/built-in.o: In function `pm_print_active_wakeup_sources': (.text+0x3c7a8): undefined reference to `__srcu_read_lock' drivers/built-in.o: In function `pm_print_active_wakeup_sources': (.text+0x3c84c): undefined reference to `__srcu_read_unlock' drivers/built-in.o: In function `device_wakeup_arm_wake_irqs': (.text+0x3d1d8): undefined reference to `__srcu_read_lock' drivers/built-in.o: In function `device_wakeup_arm_wake_irqs': (.text+0x3d228): undefined reference to `__srcu_read_unlock' drivers/built-in.o: In function `device_wakeup_disarm_wake_irqs': (.text+0x3d24c): undefined reference to `__srcu_read_lock' drivers/built-in.o: In function `device_wakeup_disarm_wake_irqs': (.text+0x3d29c): undefined reference to `__srcu_read_unlock' drivers/built-in.o:(.data+0x4158): undefined reference to `process_srcu' Fix this error by selecting CONFIG_SRCU when PM_SLEEP is enabled. Fixes:ea0212f40c(power: auto select CONFIG_SRCU) Cc: 4.2+ <stable@vger.kernel.org> # 4.2+ Signed-off-by: zhangyi (F) <yi.zhang@huawei.com> [ rjw: Minor subject/changelog fixups ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>