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

[WANG Xuerui]

On 2023/3/31 10:53, Huacai Chen wrote:
> 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 */

Reviewed-by: WANG Xuerui <git@xxxxxxxxxx>

Thanks!

--
WANG "xen0n" Xuerui

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