[PATCH] LoongArch: Fix build error if CONFIG_SUSPEND is not set

From: Huacai Chen
Date: Thu Mar 30 2023 - 22:53:49 EST


We can see the following build error on LoongArch if CONFIG_SUSPEND is
not set:

ld: drivers/acpi/sleep.o: in function 'acpi_pm_prepare':
sleep.c:(.text+0x2b8): undefined reference to 'loongarch_wakeup_start'

Here is the call trace:

acpi_pm_prepare()
__acpi_pm_prepare()
acpi_sleep_prepare()
acpi_get_wakeup_address()
loongarch_wakeup_start()

Root cause: loongarch_wakeup_start() is defined in arch/loongarch/power/
suspend_asm.S which is only built under CONFIG_SUSPEND. In order to fix
the build error, just let acpi_get_wakeup_address() return 0 if CONFIG_
SUSPEND is not set.

Fixes: 366bb35a8e48 ("LoongArch: Add suspend (ACPI S3) support")
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/11215033-fa3c-ecb1-2fc0-e9aeba47be9b@xxxxxxxxxxxxx/
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
---
arch/loongarch/include/asm/acpi.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm/acpi.h
index 4198753aa1d0..976a810352c6 100644
--- a/arch/loongarch/include/asm/acpi.h
+++ b/arch/loongarch/include/asm/acpi.h
@@ -41,8 +41,11 @@ extern void loongarch_suspend_enter(void);

static inline unsigned long acpi_get_wakeup_address(void)
{
+#ifdef CONFIG_SUSPEND
extern void loongarch_wakeup_start(void);
return (unsigned long)loongarch_wakeup_start;
+#endif
+ return 0UL;
}

#endif /* _ASM_LOONGARCH_ACPI_H */
--
2.39.1