linux-kernel - [PATCH] dmaengine: owl-dma: fix clang -Wvoid-pointer-to-enum-cast warning

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Message-ID: <20230816-void-drivers-dma-owl-dma-v1-1-a0a5e085e937@google.com>
Date:   Wed, 16 Aug 2023 20:12:50 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     Vinod Koul <vkoul@...nel.org>,
        "Andreas Färber" <afaerber@...e.de>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>
Cc:     dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] dmaengine: owl-dma: fix clang -Wvoid-pointer-to-enum-cast warning

When building with clang 18 I see the following warning:
|       drivers/dma/owl-dma.c:1119:14: warning: cast to smaller integer type
|       'enum owl_dma_id' from 'const void *' [-Wvoid-pointer-to-enum-cast]
|        1119 | od->devid = (enum owl_dma_id)of_device_get_match_data(&pdev->dev);

This is due to the fact that `of_device_get_match_data()` returns a
void* while `enum owl_dma_id` has the size of an int.

Cast result of `of_device_get_match_data()` to a uintptr_t to silence
the above warning for clang builds using W=1

Link: https://github.com/ClangBuiltLinux/linux/issues/1910
Reported-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
 drivers/dma/owl-dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/owl-dma.c b/drivers/dma/owl-dma.c
index b6e0ac8314e5..f340a04579f4 100644
--- a/drivers/dma/owl-dma.c
+++ b/drivers/dma/owl-dma.c
@@ -1116,7 +1116,7 @@ static int owl_dma_probe(struct platform_device *pdev)
 	dev_info(&pdev->dev, "dma-channels %d, dma-requests %d\n",
 		 nr_channels, nr_requests);
 
-	od->devid = (enum owl_dma_id)of_device_get_match_data(&pdev->dev);
+	od->devid = (uintptr_t)of_device_get_match_data(&pdev->dev);
 
 	od->nr_pchans = nr_channels;
 	od->nr_vchans = nr_requests;

---
base-commit: 2ccdd1b13c591d306f0401d98dedc4bdcd02b421
change-id: 20230816-void-drivers-dma-owl-dma-41b95a098275

Best regards,
--
Justin Stitt <justinstitt@...gle.com>