Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 4 Nov 2020 20:17:33 +0100
From:   Vasily Gorbik <gor@linux.ibm.com>
To:     Andrey Konovalov <andreyknvl@google.com>
Cc:     Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        kasan-dev@googlegroups.com, Dmitry Vyukov <dvyukov@google.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Marco Elver <elver@google.com>,
        Evgenii Stepanov <eugenis@google.com>,
        Elena Petrova <lenaptr@google.com>,
        Branislav Rankov <Branislav.Rankov@arm.com>,
        Kevin Brodsky <kevin.brodsky@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 34/41] kasan, x86, s390: update undef CONFIG_KASAN
Message-ID: <your-ad-here.call-01604517453-ext-4014@work.hours>
References: <cover.1604333009.git.andreyknvl@google.com>
 <bd64e051e8e36ac25751debc071887af3d7f663f.1604333009.git.andreyknvl@google.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <bd64e051e8e36ac25751debc071887af3d7f663f.1604333009.git.andreyknvl@google.com>
Precedence: bulk

On Mon, Nov 02, 2020 at 05:04:14PM +0100, Andrey Konovalov wrote:
> With the intoduction of hardware tag-based KASAN some kernel checks of
> this kind:
> 
>   ifdef CONFIG_KASAN
> 
> will be updated to:
> 
>   if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
> 
> x86 and s390 use a trick to #undef CONFIG_KASAN for some of the code
> that isn't linked with KASAN runtime and shouldn't have any KASAN
> annotations.
> 
> Also #undef CONFIG_KASAN_GENERIC with CONFIG_KASAN.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
> Reviewed-by: Marco Elver <elver@google.com>
> ---
> Change-Id: I2a622db0cb86a8feb60c30d8cb09190075be2a90
> ---
>  arch/s390/boot/string.c         | 1 +
>  arch/x86/boot/compressed/misc.h | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/arch/s390/boot/string.c b/arch/s390/boot/string.c
> index b11e8108773a..faccb33b462c 100644
> --- a/arch/s390/boot/string.c
> +++ b/arch/s390/boot/string.c
> @@ -3,6 +3,7 @@
>  #include <linux/kernel.h>
>  #include <linux/errno.h>
>  #undef CONFIG_KASAN
> +#undef CONFIG_KASAN_GENERIC
>  #include "../lib/string.c"

for s390 part
Acked-by: Vasily Gorbik <gor@linux.ibm.com>