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Wed, 4 Nov 2020 19:17:36 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 24EAE4C040; Wed, 4 Nov 2020 19:17:36 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F10C64C044; Wed, 4 Nov 2020 19:17:34 +0000 (GMT) Received: from localhost (unknown [9.145.163.252]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Wed, 4 Nov 2020 19:17:34 +0000 (GMT) Date: Wed, 4 Nov 2020 20:17:33 +0100 From: Vasily Gorbik To: Andrey Konovalov Cc: Catalin Marinas , Will Deacon , Vincenzo Frascino , kasan-dev@googlegroups.com, Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , Marco Elver , Evgenii Stepanov , Elena Petrova , Branislav Rankov , Kevin Brodsky , Andrew Morton , 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: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-04_12:2020-11-04,2020-11-04 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=1 adultscore=0 mlxlogscore=999 clxscore=1015 phishscore=0 spamscore=0 priorityscore=1501 mlxscore=0 malwarescore=0 impostorscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011040135 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 > Signed-off-by: Vincenzo Frascino > Reviewed-by: Marco Elver > --- > 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 > #include > #undef CONFIG_KASAN > +#undef CONFIG_KASAN_GENERIC > #include "../lib/string.c" for s390 part Acked-by: Vasily Gorbik