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Mon, 10 Nov 2025 09:30:19 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6D2AC20049; Mon, 10 Nov 2025 09:30:19 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 828DA20040; Mon, 10 Nov 2025 09:30:18 +0000 (GMT) Received: from osiris (unknown [9.87.148.55]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Mon, 10 Nov 2025 09:30:18 +0000 (GMT) Date: Mon, 10 Nov 2025 10:30:17 +0100 From: Heiko Carstens To: Aleksei Nikiforov Cc: Alexander Potapenko , Marco Elver , Dmitry Vyukov , Andrew Morton , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Huth , Juergen Christ , Ilya Leoshkevich Subject: Re: [PATCH v2] s390/fpu: Fix false-positive kmsan report in fpu_vstl function Message-ID: <20251110093017.15528A26-hca@linux.ibm.com> References: <20251107155914.1407772-3-aleksei.nikiforov@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; 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If 'index' > 0, 'vstl' writes > at least 2 bytes. > > clang generates kmsan write helper call depending on inline assembly > constraints. Constraints are evaluated compile-time, but value of > 'index' argument is known only at runtime. > > clang currently generates call to __msan_instrument_asm_store with 1 byte > as size. Manually call kmsan function to indicate correct amount of bytes > written and fix false-positive report. ... > Fixes: dcd3e1de9d17 ("s390/checksum: provide csum_partial_copy_nocheck()") > Signed-off-by: Aleksei Nikiforov > --- > arch/s390/include/asm/fpu-insn.h | 3 +++ > 1 file changed, 3 insertions(+) Applied, thanks!