linux-kernel - Re: [PATCH mm] kasan: export HW

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Date:   Fri, 12 Feb 2021 21:21:39 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will.deacon@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Christoph Hellwig <hch@...radead.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH mm] kasan: export HW_TAGS symbols for KUnit tests

On Fri, Feb 12, 2021 at 9:16 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Fri, 12 Feb 2021 21:08:52 +0100 Andrey Konovalov <andreyknvl@...gle.com> wrote:
>
> > Currently, building KASAN-KUnit tests as a module fails with:
> >
> > ERROR: modpost: "mte_enable_kernel" [lib/test_kasan.ko] undefined!
> > ERROR: modpost: "mte_set_report_once" [lib/test_kasan.ko] undefined!
> >
> > This change adds KASAN wrappers for mte_enable_kernel() and
> > mte_set_report_once() and only defines and exports them when KASAN-KUnit
> > tests are enabled.
> >
> > The wrappers aren't defined when tests aren't enabled to avoid misuse.
> > The mte_() functions aren't exported directly to avoid having low-level
> > KASAN ifdefs in the arch code.
> >
>
> Please confirm that this is applicable to current Linus mainline?

It's not applicable. KUnit tests for HW_TAGS aren't supported there,
the patches for that are in mm only. So no need to put it into 5.11.

> Today is pretty much the last day for getting material into 5.11, and
> this patch has been churning somewhat.
>
> So I think it would be better to merge this into 5.12-rc1, with a
> cc:stable so it goes into 5.11.1.
>
> For which we'll need a Fixes:, please?
>
> --
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