When building with W=1, we get the following warning:

drivers/acpi/arm64/agdi.c:88:13: warning: no previous prototype for ‘acpi_agdi_init’ [-Wmissing-prototypes]
 void __init acpi_agdi_init(void)

Include AGDI driver's header file to pull in the prototype definition
for acpi_agdi_init() to get rid of the compiler warning

Fixes: a2a591fb76e6 ("ACPI: AGDI: Add driver for Arm Generic Diagnostic Dump and Reset device")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
---
 drivers/acpi/arm64/agdi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/arm64/agdi.c b/drivers/acpi/arm64/agdi.c
index 4df337d545b7..cf31abd0ed1b 100644
--- a/drivers/acpi/arm64/agdi.c
+++ b/drivers/acpi/arm64/agdi.c
@@ -9,6 +9,7 @@
 #define pr_fmt(fmt) "ACPI: AGDI: " fmt
 
 #include <linux/acpi.h>
+#include <linux/acpi_agdi.h>
 #include <linux/arm_sdei.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
-- 
2.17.1

On Tue, Apr 26, 2022 at 12:18 AM Ilkka Koskinen
<ilkka@os.amperecomputing.com> wrote:
>
> When building with W=1, we get the following warning:
>
> drivers/acpi/arm64/agdi.c:88:13: warning: no previous prototype for ‘acpi_agdi_init’ [-Wmissing-prototypes]
>  void __init acpi_agdi_init(void)
>
> Include AGDI driver's header file to pull in the prototype definition
> for acpi_agdi_init() to get rid of the compiler warning
>
> Fixes: a2a591fb76e6 ("ACPI: AGDI: Add driver for Arm Generic Diagnostic Dump and Reset device")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
> ---
>  drivers/acpi/arm64/agdi.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/acpi/arm64/agdi.c b/drivers/acpi/arm64/agdi.c
> index 4df337d545b7..cf31abd0ed1b 100644
> --- a/drivers/acpi/arm64/agdi.c
> +++ b/drivers/acpi/arm64/agdi.c
> @@ -9,6 +9,7 @@
>  #define pr_fmt(fmt) "ACPI: AGDI: " fmt
>
>  #include <linux/acpi.h>
> +#include <linux/acpi_agdi.h>
>  #include <linux/arm_sdei.h>
>  #include <linux/io.h>
>  #include <linux/kernel.h>
> --

Applied as 5.19 material, thanks!