[prev in list] [next in list] [prev in thread] [next in thread]
List: linux-kernel
Subject: Re: [PATCH 00/19] Enable -Wshadow=local for kernel/sched
From: Kees Cook <keescook () chromium ! org>
Date: 2022-03-02 18:32:23
Message-ID: 202203021030.EEEF58C2 () keescook
[Download RAW message or body]
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.
You are my hero. I was pulling my hair out trying to figure out how
to deal with this a few months ago, and the use of UNIQUE_ID was the
key. Yay!
> 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 think it's pretty darn close. One thing that can be done to test the
results for the first 12 patches is to do a binary comparison -- these
changes _should_ have no impact on the final machine code. (It'll
totally change the debug sections, etc, but the machine code should be
the same.)
--
Kees Cook
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic