linux-kernel - Re: [PATCH 00/19] Enable -Wshadow=local for kernel/sched

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Date: Tue, 16 Apr 2024 14:15:04 -0700
From: Kees Cook <keescook@...omium.org>
To: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/19] Enable -Wshadow=local for kernel/sched

*thread necromancy*

On Wed, Mar 02, 2022 at 04:34:32AM +0000, Matthew Wilcox (Oracle) wrote:
> I thought I'd choose one of the more core parts of the kernel to
> demonstrate the value of -Wshadow.  It found two places where there are
> shadowed variables that are at least confusing.  For all I know they're
> buggy and my resolution of these warnings is wrong.
> 
> The first 12 patches just untangle the unclean uses of __ret in wait.h
> & friends.  Then 4 patches to fix problems in headers that are noticed
> by kernel/sched.  Two patches fix the two places in kernel/sched/
> with shadowed variables and the final patch adds -Wshadow=local to
> the Makefile.
> 
> I'm quite certain this patch series isn't going in as-is.  But maybe
> it'll inspire some patches that can go in.

I was looking at -Wshadow=local again, and remembered this series. It
sounded like things were close, but a tweak was needed. What would be
next to get this working?

Thanks!

-Kees

-- 
Kees Cook