On Fri, Mar 29, 2024 at 01:49:17PM +0100, Jean Delvare wrote: > Hi Arnd, > > On Tue, 26 Mar 2024 15:51:30 +0100, Arnd Bergmann wrote: > > From: Arnd Bergmann <arnd@xxxxxxxx> > > > > dmi_class uses kfree() as the .release function, but that now causes > > a warning with clang-16 as it violates control flow integrity (KCFI) > > rules: > > > > drivers/firmware/dmi-id.c:174:17: error: cast from 'void (*)(const void *)' to 'void (*)(struct device *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict] > > 174 | .dev_release = (void(*)(struct device *)) kfree, > > > > Add an explicit function to call kfree() instead. > > > > Fixes: 4f5c791a850e ("DMI-based module autoloading") > > Not sure if this fixes tag is really warranted. As I understand it, > your change only removes a warning but there was no actual bug, right? Sort of, the warning is really pointing out that calling this callback will result in a crash at runtime when the kernel is built with kCFI enabled, which I would consider a bug. Cheers, Nathan