Messages in this thread Patch in this message | | | Date | Wed, 16 Aug 2023 19:37:52 +0000 | Subject | [PATCH] leds: pca955x: fix -Wvoid-pointer-to-enum-cast warning | From | Justin Stitt <> |
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When building with clang 18 I see the following warning: | drivers/leds/leds-pca955x.c:487:15: warning: cast to smaller integer | type 'enum pca955x_type' from 'const void *' [-Wvoid-pointer-to-enum-cast] | 487 | chip_type = (enum pca955x_type)md;
This is due to the fact that `md` is a void* while `enum pca995x_type` has the size of an int.
Add uintptr_t cast to silence clang warning while also keeping enum cast for readability and consistency with other `chip_type` assignment just a few lines below: | chip_type = (enum pca955x_type)id->driver_data;
Link: https://github.com/ClangBuiltLinux/linux/issues/1910 Reported-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Justin Stitt <justinstitt@google.com> ---
leds: pca955x: fix -Wvoid-pointer-to-enum-cast warning --- Note: I've opted to keep the initial `enum pca955x_type` cast and just place the uintptr_t cast first to silence the warning. It seemed weird to me to see the same variable being assigned to two different casted values within just a few lines. --- drivers/leds/leds-pca955x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c index b10e1ef38db0..1d7fa0cd97bf 100644 --- a/drivers/leds/leds-pca955x.c +++ b/drivers/leds/leds-pca955x.c @@ -484,7 +484,7 @@ static int pca955x_probe(struct i2c_client *client) const void *md = device_get_match_data(&client->dev); if (md) { - chip_type = (enum pca955x_type)md; + chip_type = (enum pca955x_type)(uintptr_t)md; } else { const struct i2c_device_id *id = i2c_match_id(pca955x_id, client); --- base-commit: 2ccdd1b13c591d306f0401d98dedc4bdcd02b421 change-id: 20230816-void-drivers-leds-leds-pca955x-7002cc67a291 Best regards, -- Justin Stitt <justinstitt@google.com>
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