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

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