GCC correctly points out an uninitialized variable use when CONFIG_PCI is 

drivers/idle/i7300_idle.c: In function 'i7300_idle_notifier':
include/asm-generic/bug.h:119:5: error: 'got_ctl' may be used uninitialized in 
this function [-Werror=maybe-uninitialized]
  if (unlikely(__ret_warn_once && !__warned)) {  \
drivers/idle/i7300_idle.c:415:5: note: 'got_ctl' was declared here
  u8 got_ctl;

The driver no longer exists in later kernels, so this patch only appplies to
linux-4.9.y and earlier.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
 drivers/idle/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/idle/Kconfig b/drivers/idle/Kconfig
index 4732dfc15447..331adc509f3a 100644
--- a/drivers/idle/Kconfig
+++ b/drivers/idle/Kconfig
@@ -17,6 +17,7 @@ config I7300_IDLE_IOAT_CHANNEL
 config I7300_IDLE
        tristate "Intel chipset idle memory power saving driver"
+       depends on PCI
        select I7300_IDLE_IOAT_CHANNEL
          Enable memory power savings when idle with certain Intel server

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