firmware: fw_cfg register offsets on supported architectures only

Refrain from defining default fw_cfg register offsets on
unsupported architectures -- throw an error instead. If
QEMU were to add fw_cfg support on additional architectures,
we should add them to the FW_CFG_SYSFS depends statement in
drivers/firmware/Kconfig, and provide default values for
register offsets in drivers/firmware/qemu_fw_cfg.c at that
time.

Suggested-by: Michael S. Tsirkin <redacted>
Signed-off-by: Gabriel Somlo <redacted>
---
 drivers/firmware/qemu_fw_cfg.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
index fedbff5..79f6b7b 100644
--- a/drivers/firmware/qemu_fw_cfg.c
+++ b/drivers/firmware/qemu_fw_cfg.c

@@ -109,9 +109,7 @@ static void fw_cfg_io_cleanup(void)
 #  define FW_CFG_CTRL_OFF 0x00
 #  define FW_CFG_DATA_OFF 0x01
 # else
-#  warning "QEMU FW_CFG may not be available on this architecture!"
-#  define FW_CFG_CTRL_OFF 0x00
-#  define FW_CFG_DATA_OFF 0x01
+#  error "QEMU FW_CFG not available on this architecture!"
 # endif
 #endif
 

-- 
2.4.3

On Mon, Feb 22, 2016 at 04:18:18PM -0500, Gabriel Somlo wrote:

Refrain from defining default fw_cfg register offsets on
unsupported architectures -- throw an error instead. If
QEMU were to add fw_cfg support on additional architectures,
we should add them to the FW_CFG_SYSFS depends statement in
drivers/firmware/Kconfig, and provide default values for
register offsets in drivers/firmware/qemu_fw_cfg.c at that
time.

Suggested-by: Michael S. Tsirkin <redacted>
Signed-off-by: Gabriel Somlo <redacted>

Acked-by: Michael S. Tsirkin <redacted>