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

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Message-Id: <20211124115728.317530279@linuxfoundation.org>
Date:   Wed, 24 Nov 2021 12:59:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Randy Dunlap <rdunlap@...radead.org>,
        Borislav Petkov <bp@...e.de>,
        Guenter Roeck <linux@...ck-us.net>,
        Pali Rohár <pali@...nel.org>
Subject: [PATCH 5.15 279/279] x86/Kconfig: Fix an unused variable error in dell-smm-hwmon

From: Randy Dunlap <rdunlap@...radead.org>

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@...db.de>
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: Pali Rohár <pali@...nel.org>
Link: https://lkml.kernel.org/r/20210910071921.16777-1-rdunlap@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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