linux-kernel - Re: [PATCH v3] kasan: remove redundant config option

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Date:   Mon, 11 Jan 2021 12:11:54 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Walter Wu <walter-zh.wu@...iatek.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v3] kasan: remove redundant config option

On Mon, Jan 11, 2021 at 08:03:29PM +0100, Andrey Konovalov wrote:
> On Mon, Jan 11, 2021 at 7:59 PM Nathan Chancellor
> <natechancellor@...il.com> wrote:
> >
> > > > -config KASAN_STACK_ENABLE
> > > > +config KASAN_STACK
> > > >         bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST
> > >
> > > Does this syntax mean that KASAN_STACK is only present for
> > > CC_IS_CLANG? Or that it can only be disabled for CC_IS_CLANG?
> >
> > It means that the option can only be disabled for clang.
> 
> OK, got it.
> 
> > > Anyway, I think it's better to 1. allow to control KASAN_STACK
> > > regardless of the compiler (as it was possible before), and 2. avoid
> >
> > It has never been possible to control KASAN_STACK for GCC because of the
> > bool ... if ... syntax. This patch does not change that logic. Making it
> > possible to control KASAN_STACK with GCC seems fine but that is going to
> > be a new change that would probably be suited for a new patch on top of
> > this one.
> 
> The if syntax was never applied to KASAN_STACK, only to
> KASAN_STACK_ENABLE, so it should have been possible (although I've
> never specifically tried it).

CONFIG_KASAN_STACK was not a user selectable symbol so it was always 1
for GCC.

Cheers,
Nathan