linux-kernel - Re: [PATCH v2 10/20] kasan: inline and rename kasan_unpoison

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Message-ID: <CAAeHK+xhjUQAtJThUHcaGmd3muBZHiJPfTqj59CMxo44hbDniw@mail.gmail.com>
Date:   Thu, 12 Nov 2020 21:54:38 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.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 v2 10/20] kasan: inline and rename kasan_unpoison_memory

On Thu, Nov 12, 2020 at 8:52 PM Marco Elver <elver@...gle.com> wrote:
>
> On Thu, 12 Nov 2020 at 20:45, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> >
> > On Wed, Nov 11, 2020 at 6:49 PM Marco Elver <elver@...gle.com> wrote:
> > >
> > > On Tue, Nov 10, 2020 at 11:20PM +0100, Andrey Konovalov wrote:
> > > > Currently kasan_unpoison_memory() is used as both an external annotation
> > > > and as an internal memory poisoning helper. Rename external annotation to
> > > > kasan_unpoison_data() and inline the internal helper for hardware
> > > > tag-based mode to avoid undeeded function calls.
> > >
> > > I don't understand why this needs to be renamed again. The users of
> > > kasan_unpoison_memory() outweigh those of kasan_unpoison_slab(), of
> > > which there seems to be only 1!
> >
> > The idea is to make kasan_(un)poison_memory() functions inlinable for
> > internal use. It doesn't have anything to do with the number of times
> > they are used.
> >
> > Perhaps we can drop the kasan_ prefix for the internal implementations
> > though, and keep using kasan_unpoison_memory() externally.
>
> Whatever avoids changing the external interface, because it seems
> really pointless. I can see why it's done, but it's a side-effect of
> the various wrappers being added.

It looks like unposion_memory() is already taken. Any suggestions for
internal KASAN poisoning function names?