linux-kernel - Re: [PATCH v9 17/44] kasan, arm64: move initialization message

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Date:   Thu, 12 Nov 2020 16:09:25 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.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 v9 17/44] kasan, arm64: move initialization message

On Wed, Nov 11, 2020 at 7:50 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
>
> On Wed, Nov 11, 2020 at 4:04 PM Alexander Potapenko <glider@...gle.com> wrote:
> >
> > On Tue, Nov 10, 2020 at 11:11 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
> > >
> > > Software tag-based KASAN mode is fully initialized with kasan_init_tags(),
> > > while the generic mode only requires kasan_init(). Move the
> > > initialization message for tag-based mode into kasan_init_tags().
> > >
> > > Also fix pr_fmt() usage for KASAN code: generic.c doesn't need it as it
> > > doesn't use any printing functions; tag-based mode should use "kasan:"
> > > instead of KBUILD_MODNAME (which stands for file name).
> > >
> > > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> > > Reviewed-by: Catalin Marinas <catalin.marinas@....com>

Reviewed-by: Alexander Potapenko <glider@...gle.com>

> > Cannot we have a single kasan_init() function that will call
> > tool-specific initialization functions and print the message at the
> > end?
>
> Unfortunately no. For different modes we need different functions that
> are called in different places in the kernel. E.g. for generic KASAN
> we only need kasan_init() to setup shadow pages; for SW tags we also
> need kasan_init_sw_tags() which initializes per-cpu state and
> finilizes initialization process.

Ok, got it.

-- 
Alexander Potapenko
Software Engineer

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