| Message ID | 20230814-void-drivers-power-reset-vexpress-poweroff-v1-1-c3d9b0107e5d@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | power: vexpress: fix -Wvoid-pointer-to-enum-cast warning | expand |
On Mon, Aug 14, 2023 at 10:21:51PM +0000, Justin Stitt wrote: > 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> Hi Sebastian, I am assuming you will pick this up. Acked-by: Sudeep Holla <sudeep.holla@arm.com>
On Mon, 14 Aug 2023 22:21:51 +0000, Justin Stitt wrote: > 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. > > [...] Applied, thanks! [1/1] power: vexpress: fix -Wvoid-pointer-to-enum-cast warning commit: 4ec7b666fb4247bc6b9cdc84fa753d8dc2994d25 Best regards,
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;
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(-) --- base-commit: 2ccdd1b13c591d306f0401d98dedc4bdcd02b421 change-id: 20230814-void-drivers-power-reset-vexpress-poweroff-ca762488cf1f Best regards, -- Justin Stitt <justinstitt@google.com>