linux-kernel - Re: [PATCH 03/35] kasan: shadow declarations only for software modes

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Message-ID: <CAAeHK+w-RyACkoeKXSXaLsZWDRQ-cy3oGFSTJ2J=Hb3CUQnWHw@mail.gmail.com>
Date:   Fri, 18 Sep 2020 16:56:25 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        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 03/35] kasan: shadow declarations only for software modes

On Fri, Sep 18, 2020 at 4:55 PM Marco Elver <elver@...gle.com> wrote:
>
> On Fri, Aug 14, 2020 at 07:26PM +0200, Andrey Konovalov wrote:
> > This is a preparatory commit for the upcoming addition of a new hardware
> > tag-based (MTE-based) KASAN mode.
> >
> > Group shadow-related KASAN function declarations and only define them
> > for the two existing software modes.
> >
> > No functional changes for software modes.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> > ---
> >  include/linux/kasan.h | 44 ++++++++++++++++++++++++++-----------------
> >  1 file changed, 27 insertions(+), 17 deletions(-)
> >
> > diff --git a/include/linux/kasan.h b/include/linux/kasan.h
> > index bd5b4965a269..44a9aae44138 100644
> > --- a/include/linux/kasan.h
> > +++ b/include/linux/kasan.h
> [...]
> > +static inline int kasan_add_zero_shadow(void *start, unsigned long size)
> > +{
> > +     return 0;
> > +}
> > +static inline void kasan_remove_zero_shadow(void *start,
> > +                                     unsigned long size)
> > +{}
>
> Readability suggestion (latest checkpatch.pl allows up to 100 cols):
>
> -static inline void kasan_remove_zero_shadow(void *start,
> -                                       unsigned long size)
> -{}
> +static inline void kasan_remove_zero_shadow(void *start, unsigned long size) {}

Will do in v3, thanks!