linux-kernel - [PATCH] drm/komeda: Use memset to initialize config

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Date:   Wed, 24 Apr 2019 23:27:20 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     "James (Qian) Wang" <james.qian.wang@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        Brian Starkey <brian.starkey@....com>
Cc:     malidp@...s.arm.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] drm/komeda: Use memset to initialize config_id

Clang warns:

drivers/gpu/drm/arm/display/komeda/komeda_dev.c:76:38: warning: suggest
braces around initialization of subobject [-Wmissing-braces]
        union komeda_config_id config_id = {0,};
                                            ^
                                            {}
1 warning generated.

One way to fix these warnings is to add additional braces like Clang
suggests; however, there has been a bit of push back from some
maintainers, who just prefer memset as it is unambiguous, doesn't
depend on a particular compiler version, and properly initializes all
subobjects [1][2]. Do that here so there are no more warnings.

[1]: https://lore.kernel.org/lkml/022e41c0-8465-dc7a-a45c-64187ecd9684@amd.com/
[2]: https://lore.kernel.org/lkml/20181128.215241.702406654469517539.davem@davemloft.net/

Fixes: 4cc734cb79a8 ("drm/komeda: Add sysfs attribute: core_id and config_id")
Link: https://github.com/ClangBuiltLinux/linux/issues/457
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/gpu/drm/arm/display/komeda/komeda_dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
index 9d6c31cca875..e605a518f59a 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
@@ -73,9 +73,10 @@ config_id_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct komeda_dev *mdev = dev_to_mdev(dev);
 	struct komeda_pipeline *pipe = mdev->pipelines[0];
-	union komeda_config_id config_id = {0,};
+	union komeda_config_id config_id;
 	int i;
 
+	memset(&config_id, 0, sizeof(config_id));
 	config_id.max_line_sz = pipe->layers[0]->hsize_in.end;
 	config_id.n_pipelines = mdev->n_pipelines;
 	config_id.n_scalers = pipe->n_scalers;
-- 
2.21.0