linux-kernel - [PATCH v1] hpet: Make cmd parameter of hpet_ioctl

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Date:   Mon, 13 Mar 2017 11:57:25 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Clemens Ladisch <clemens@...isch.de>
Cc:     linux-kernel@...r.kernel.org,
        Grant Grundler <grundler@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v1] hpet: Make cmd parameter of hpet_ioctl_common() unsigned

The value passed by the two callers of the function is unsigned anyway.

Making the parameter unsigned fixes the following warning when building
with clang:

drivers/char/hpet.c:588:7: error: overflow converting case value to switch condition type (2149083139 to 18446744071563667459) [-Werror,-Wswitch]
        case HPET_INFO:
             ^
include/uapi/linux/hpet.h:18:19: note: expanded from macro 'HPET_INFO'
                        ^
include/uapi/asm-generic/ioctl.h:77:28: note: expanded from macro '_IOR'
                                ^
include/uapi/asm-generic/ioctl.h:66:2: note: expanded from macro '_IOC'
        (((dir)  << _IOC_DIRSHIFT) | \

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
 drivers/char/hpet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index 20b32bb8c2af..0d633b76c29e 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -574,7 +574,7 @@ static inline unsigned long hpet_time_div(struct hpets *hpets,
 }
 
 static int
-hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg,
+hpet_ioctl_common(struct hpet_dev *devp, unsigned int cmd, unsigned long arg,
 		  struct hpet_info *info)
 {
 	struct hpet_timer __iomem *timer;
-- 
2.12.0.246.ga2ecc84866-goog