When building with W=1 we see the following warning: | drivers/i2c/busses/i2c-bcm-iproc.c:1039:3: error: cast to smaller \ | integer type 'enum bcm_iproc_i2c_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast] | 1039 | (enum bcm_iproc_i2c_type)of_device_get_match_data(&pdev->dev); | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This is due to the fact that the `bcm_iproc_i2c_type` enum members are int-width and a cast from pointer-width down to int will cause truncation and possible data loss. Although in this case `bcm_iproc_i2c_type` has only a few enumerated fields and thus there is likely no data loss occurring. Nonetheless, this patch is necessary to the goal of promoting this warning out of W=1. Link: https://github.com/ClangBuiltLinux/linux/issues/1903 Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx> --- drivers/i2c/busses/i2c-bcm-iproc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c index 2d8342fdc25d..3464f3a376a5 100644 --- a/drivers/i2c/busses/i2c-bcm-iproc.c +++ b/drivers/i2c/busses/i2c-bcm-iproc.c @@ -1036,7 +1036,7 @@ static int bcm_iproc_i2c_probe(struct platform_device *pdev) platform_set_drvdata(pdev, iproc_i2c); iproc_i2c->device = &pdev->dev; iproc_i2c->type = - (enum bcm_iproc_i2c_type)of_device_get_match_data(&pdev->dev); + (unsigned long) of_device_get_match_data(&pdev->dev); init_completion(&iproc_i2c->done); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); -- 2.41.0.640.ga95def55d0-goog
