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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nathan Chancellor <natechancellor@gmail.com>,
	Ezequiel Garcia <ezequiel@collabora.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>,
	Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-media@vger.kernel.org, clang-built-linux@googlegroups.com
Subject: [PATCH AUTOSEL 5.4 184/459] media: v4l2-device.h: Explicitly compare grp{id,mask} to zero in v4l2_device macros
Date: Fri, 14 Feb 2020 10:57:14 -0500
Message-ID: <20200214160149.11681-184-sashal@kernel.org> (raw)
In-Reply-To: <20200214160149.11681-1-sashal@kernel.org>

From: Nathan Chancellor <natechancellor@gmail.com>

[ Upstream commit afb34781620274236bd9fc9246e22f6963ef5262 ]

When building with Clang + -Wtautological-constant-compare, several of
the ivtv and cx18 drivers warn along the lines of:

 drivers/media/pci/cx18/cx18-driver.c:1005:21: warning: converting the
 result of '<<' to a boolean always evaluates to true
 [-Wtautological-constant-compare]
                         cx18_call_hw(cx, CX18_HW_GPIO_RESET_CTRL,
                                         ^
 drivers/media/pci/cx18/cx18-cards.h:18:37: note: expanded from macro
 'CX18_HW_GPIO_RESET_CTRL'
 #define CX18_HW_GPIO_RESET_CTRL         (1 << 6)
                                           ^
 1 warning generated.

This warning happens because the shift operation is implicitly converted
to a boolean in v4l2_device_mask_call_all before being negated. This can
be solved by just comparing the mask result to 0 explicitly so that
there is no boolean conversion. The ultimate goal is to enable
-Wtautological-compare globally because there are several subwarnings
that would be helpful to have.

For visual consistency and avoidance of these warnings in the future,
all of the implicitly boolean conversions in the v4l2_device macros
are converted to explicit ones as well.

Link: https://github.com/ClangBuiltLinux/linux/issues/752

Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/media/v4l2-device.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index e0b8f2602670d..a0e93f0ef62a1 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -371,7 +371,7 @@ static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev)
 		struct v4l2_subdev *__sd;				\
 									\
 		__v4l2_device_call_subdevs_p(v4l2_dev, __sd,		\
-			!(grpid) || __sd->grp_id == (grpid), o, f ,	\
+			(grpid) == 0 || __sd->grp_id == (grpid), o, f ,	\
 			##args);					\
 	} while (0)
 
@@ -403,7 +403,7 @@ static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev)
 ({									\
 	struct v4l2_subdev *__sd;					\
 	__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd,		\
-			!(grpid) || __sd->grp_id == (grpid), o, f ,	\
+			(grpid) == 0 || __sd->grp_id == (grpid), o, f ,	\
 			##args);					\
 })
 
@@ -431,8 +431,8 @@ static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev)
 		struct v4l2_subdev *__sd;				\
 									\
 		__v4l2_device_call_subdevs_p(v4l2_dev, __sd,		\
-			!(grpmsk) || (__sd->grp_id & (grpmsk)), o, f ,	\
-			##args);					\
+			(grpmsk) == 0 || (__sd->grp_id & (grpmsk)), o,	\
+			f , ##args);					\
 	} while (0)
 
 /**
@@ -462,8 +462,8 @@ static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev)
 ({									\
 	struct v4l2_subdev *__sd;					\
 	__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd,		\
-			!(grpmsk) || (__sd->grp_id & (grpmsk)), o, f ,	\
-			##args);					\
+			(grpmsk) == 0 || (__sd->grp_id & (grpmsk)), o,	\
+			f , ##args);					\
 })
 
 
-- 
2.20.1


  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214160149.11681-1-sashal@kernel.org>
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 014/459] media: i2c: adv748x: Fix unsafe macros Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 015/459] media: meson: add missing allocation failure check on new_buf Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 035/459] media: ov5640: Fix check for PLL1 exceeding max allowed rate Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 036/459] media: i2c: mt9v032: fix enum mbus codes and frame sizes Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 037/459] media: sun4i-csi: Deal with DRAM offset Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 038/459] media: sun4i-csi: Fix data sampling polarity handling Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 040/459] media: sun4i-csi: Fix [HV]sync " Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 048/459] media: sti: bdisp: fix a possible sleep-in-atomic-context bug in bdisp_device_run() Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 178/459] media: cx23885: Add support for AVerMedia CE310B Sasha Levin
2020-02-14 15:57 ` Sasha Levin [this message]
2020-02-14 16:00 ` [PATCH AUTOSEL 5.4 384/459] media: uvcvideo: Add a quirk to force GEO GC6500 Camera bits-per-pixel value Sasha Levin

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