On Tue, Feb 13, 2024 at 11:17:49AM +0100, Arnd Bergmann wrote: > clang warns about explicitly casting between incompatible function > pointers: > > drivers/tty/hvc/hvc_iucv.c:1100:23: error: cast from 'void (*)(const void *)' to 'void (*)(struct device *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict] > 1100 | priv->dev->release = (void (*)(struct device *)) kfree; > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Such a cast of course is explicitly allowed by 6.3.2.3/8, only calling a function using a non-compatible type is UB. This warning message is quite misleading. Doubly so because of the -Werror, as always. Your proposed new code of course is nice and simple (albeit a bit bigger than it was before, both source and binary). Such is life ;-) Segher
