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Date:   Sun, 11 Apr 2021 15:03:16 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Catalin Marinas <catalin.marinas@arm.com>
Cc:     Andrey Konovalov <andreyknvl@google.com>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Nathan Chancellor <natechancellor@gmail.com>,
        Arnd Bergmann <arnd@arndb.de>,
        kasan-dev <kasan-dev@googlegroups.com>,
        Linux Memory Management List <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        wsd_upstream <wsd_upstream@mediatek.com>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@lists.infradead.org>,
        Walter Wu <walter-zh.wu@mediatek.com>
Subject: Re: [PATCH v4] kasan: remove redundant config option
Message-Id: <20210411150316.d60aa0b5174adf2370538809@linux-foundation.org>
In-Reply-To: <20210411105332.GA23778@arm.com>
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        <20210330223637.f3c73a78c64587e615d26766@linux-foundation.org>
        <20210411105332.GA23778@arm.com>
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On Sun, 11 Apr 2021 11:53:33 +0100 Catalin Marinas <catalin.marinas@arm.com> wrote:

> Hi Andrew,
> 
> On Tue, Mar 30, 2021 at 10:36:37PM -0700, Andrew Morton wrote:
> > On Mon, 29 Mar 2021 16:54:26 +0200 Andrey Konovalov <andreyknvl@google.com> wrote:
> > > Looks like my patch "kasan: fix KASAN_STACK dependency for HW_TAGS"
> > > that was merged into 5.12-rc causes a build time warning:
> > > 
> > > include/linux/kasan.h:333:30: warning: 'CONFIG_KASAN_STACK' is not
> > > defined, evaluates to 0 [-Wundef]
> > > #if defined(CONFIG_KASAN) && CONFIG_KASAN_STACK
> > > 
> > > The fix for it would either be reverting the patch (which would leave
> > > the initial issue unfixed) or applying this "kasan: remove redundant
> > > config option" patch.
> > > 
> > > Would it be possible to send this patch (with the fix-up you have in
> > > mm) for the next 5.12-rc?
> > > 
> > > Here are the required tags:
> > > 
> > > Fixes: d9b571c885a8 ("kasan: fix KASAN_STACK dependency for HW_TAGS")
> > > Cc: stable@vger.kernel.org
> > 
> > Got it, thanks.  I updated the changelog to mention the warning fix and
> > moved these ahead for a -rc merge.
> 
> Is there a chance this patch makes it into 5.12? I still get the warning
> with the latest Linus' tree (v5.12-rc6-408-g52e44129fba5) when enabling
> KASAN_HW_TAGS.

Trying.   We're still awaiting a tested fix for
https://lkml.kernel.org/r/CA+fCnZf1ABrQg0dsxtoZa9zM1BSbLYq_Xbu+xi9cv8WAZxdC2g@mail.gmail.com