[PATCH 5.15 279/279] x86/Kconfig: Fix an unused variable error in dell-smm-hwmon

[Greg Kroah-Hartman]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

commit ef775a0e36c6a81c5b07cb228c02f967133fe768 upstream.

When CONFIG_PROC_FS is not set, there is a build warning (turned
into an error):

  ../drivers/hwmon/dell-smm-hwmon.c: In function 'i8k_init_procfs':
  ../drivers/hwmon/dell-smm-hwmon.c:624:24: error: unused variable 'data' [-Werror=unused-variable]
    struct dell_smm_data *data = dev_get_drvdata(dev);

Make I8K depend on PROC_FS and HWMON (instead of selecting HWMON -- it
is strongly preferred to not select entire subsystems).

Build tested in all possible combinations of SENSORS_DELL_SMM, I8K, and
PROC_FS.

Fixes: 039ae58503f3 ("hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k")
Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Acked-by: Pali Rohár <pali@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20210910071921.16777-1-rdunlap@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/x86/Kconfig |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1256,7 +1256,8 @@ config TOSHIBA
 
 config I8K
 	tristate "Dell i8k legacy laptop support"
-	select HWMON
+	depends on HWMON
+	depends on PROC_FS
 	select SENSORS_DELL_SMM
 	help
 	  This option enables legacy /proc/i8k userspace interface in hwmon