From 3df6f61fff49632492490fb6e42646b803a9958a Mon Sep 17 00:00:00 2001
From: "zhangyi (F)" <yi.zhang@huawei.com>
Date: Tue, 14 Aug 2018 10:34:42 +0800
Subject: [PATCH] PM / sleep: wakeup: Fix build error caused by missing SRCU support
Git-commit: 3df6f61fff49632492490fb6e42646b803a9958a
Patch-mainline: v4.19-rc1
References: bsc#1051510

Commit ea0212f40c6 (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'
(.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'
(.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'
(.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: ea0212f40c6 (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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 kernel/power/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index e880ca22c5a5..3a6c2f87699e 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -105,6 +105,7 @@ config PM_SLEEP
 	def_bool y
 	depends on SUSPEND || HIBERNATE_CALLBACKS
 	select PM
+	select SRCU
 
 config PM_SLEEP_SMP
 	def_bool y
-- 
2.18.0