The wistron_btns driver calls rtc_cmos_read(), which isn't available with UML builds, so disable this driver on UML. Prevents this build error: ld: drivers/input/misc/wistron_btns.o: in function `poll_bios': wistron_btns.c:(.text+0x4be): undefined reference to `rtc_cmos_read' Fixes: 0bbadafdc49d ("um: allow disabling NO_IOMEM") # v5.14+ Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Cc: Johannes Berg <johannes.berg@xxxxxxxxx> Cc: Richard Weinberger <richard@xxxxxx> Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Cc: Miloslav Trmac <mitr@xxxxxxxx> Cc: linux-input@xxxxxxxxxxxxxxx Cc: linux-um@xxxxxxxxxxxxxxxxxxx --- drivers/input/misc/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -- a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -330,7 +330,7 @@ config INPUT_CPCAP_PWRBUTTON config INPUT_WISTRON_BTNS tristate "x86 Wistron laptop button interface" - depends on X86_32 + depends on X86_32 && !UML select INPUT_SPARSEKMAP select NEW_LEDS select LEDS_CLASS