[linux-next:master] BUILD REGRESSION 736ee37e2e8eed7fe48d0a37ee5a709514d478b3

[Luc Van Oostenryck]

On Fri, May 20, 2022 at 02:46:20PM +0200, Geert Uytterhoeven wrote:
> > The "(void)" makes sure there is no return value.
> > Which matters if the result of a function returning void is propagated
> > to another function returning void.
> 
> Which, FTR, sparse also doesn't like:
> 
>     error: return expression in void function


You should get this message only if the expression is itself not void.
For example:
	$ cat test.c
	extern void fun(void);
	
	static void ko(int *ptr)
	{
		return *ptr;
	}
	
	static void ok1(int *ptr)
	{
		return (void) *ptr;
	}
	
	static void ok2(int *ptr)
	{
		return fun();
	}
	$ sparse test.c
	test.c:5:16: error: return expression in void function

IOW, sparse warn only for the ko() but not for ok1() or ok2().

If you have a case whee it s not the case, please send me the
pre-processed file and I'll be glad to investigate.

Best regards,
-- Luc