Re: [PATCH v1 1/1] platform/x86: ideapad-laptop: Make the scope_guard() clear of its scope

[Josh Poimboeuf <jpoimboe@kernel.org>]

On Thu, Aug 29, 2024 at 07:50:32PM +0300, Andy Shevchenko wrote:
> First of all, it's a bit counterintuitive to have something like
> 
> 	int err;
> 	...
> 	scoped_guard(...)
> 		err = foo(...);
> 	if (err)
> 		return err;
> 
> Second, with a particular kernel configuration and compiler version in
> one of such cases the objtool is not happy:
> 
>   ideapad-laptop.o: warning: objtool: .text.fan_mode_show: unexpected end of section
>
> I'm not an expert on all this, but the theory is that compiler and
> linker in this case can't understand that 'result' variable will be
> always initialized as long as no error has been returned. Assigning
> 'result' to a dummy value helps with this. Note, that fixing the
> scoped_guard() scope (as per above) does not make issue gone.

I'm not sure I buy that, we should look closer to understand what the
issue is.  Can you share the config and/or toolchain version(s) need to
trigger the warning?

-- 
Josh