Messages in this thread Patch in this message | | | Date | Mon, 14 Aug 2023 22:21:51 +0000 | Subject | [PATCH] power: vexpress: 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/power/reset/vexpress-poweroff.c:124:10: warning: cast to smaller integer type 'enum vexpress_reset_func' from 'const void *' [-Wvoid-pointer-to-enum-cast] | 124 | switch ((enum vexpress_reset_func)match->data) {
This is due to the fact that `match->data` is a void* while `enum vexpress_reset_func` has the size of an int. This leads to truncation and possible data loss.
Link: https://github.com/ClangBuiltLinux/linux/issues/1910 Reported-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Justin Stitt <justinstitt@google.com> --- Note: In this case, it seems unlikely that any data loss is occurring since `enum vexpress_reset_func` only has a few fields enumerated from 0. --- drivers/power/reset/vexpress-poweroff.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/power/reset/vexpress-poweroff.c b/drivers/power/reset/vexpress-poweroff.c index 447ffdacddf9..17064d7b19f6 100644 --- a/drivers/power/reset/vexpress-poweroff.c +++ b/drivers/power/reset/vexpress-poweroff.c @@ -121,7 +121,7 @@ static int vexpress_reset_probe(struct platform_device *pdev) return PTR_ERR(regmap); dev_set_drvdata(&pdev->dev, regmap); - switch ((enum vexpress_reset_func)match->data) { + switch ((uintptr_t)match->data) { case FUNC_SHUTDOWN: vexpress_power_off_device = &pdev->dev; pm_power_off = vexpress_power_off; --- base-commit: 2ccdd1b13c591d306f0401d98dedc4bdcd02b421 change-id: 20230814-void-drivers-power-reset-vexpress-poweroff-ca762488cf1f Best regards, -- Justin Stitt <justinstitt@google.com>
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