From patchwork Thu Oct 15 03:32:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Aneesh Kumar K.V" X-Patchwork-Id: 11838575 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EB9E51580 for ; Thu, 15 Oct 2020 03:32:23 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8ED7F22255 for ; Thu, 15 Oct 2020 03:32:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="dhXzwO7T" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8ED7F22255 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 83AA66B0062; 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Thu, 15 Oct 2020 03:32:18 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma05wdc.us.ibm.com with ESMTP id 3434k9ehrx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 15 Oct 2020 03:32:17 +0000 Received: from b01ledav002.gho.pok.ibm.com (b01ledav002.gho.pok.ibm.com [9.57.199.107]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 09F3WHP520971914 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 15 Oct 2020 03:32:17 GMT Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6E110124054; Thu, 15 Oct 2020 03:32:17 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 44E5E124053; Thu, 15 Oct 2020 03:32:15 +0000 (GMT) Received: from skywalker.ibmuc.com (unknown [9.199.63.66]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 15 Oct 2020 03:32:14 +0000 (GMT) From: "Aneesh Kumar K.V" To: linux-mm@kvack.org, linux-riscv@lists.infradead.org Cc: akpm@linux-foundation.org, Anshuman Khandual , "Aneesh Kumar K.V" Subject: [PATCH] mm/debug_vm_pgtable: Avoid kernel crash with riscv Date: Thu, 15 Oct 2020 09:02:06 +0530 Message-Id: <20201015033206.140550-1-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-10-15_01:2020-10-14,2020-10-15 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 mlxlogscore=917 malwarescore=0 mlxscore=0 clxscore=1015 phishscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010150022 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: It was observed that the usage of RANDOM_ORVALUE with a valid pte cause kernel crash on riscv. Comment out the usage of random value on riscv Signed-off-by: Aneesh Kumar K.V --- mm/debug_vm_pgtable.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index c36530c69e33..98b101a8fd2a 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -548,7 +548,9 @@ static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, pte_t pte = pfn_pte(pfn, prot); pr_debug("Validating PTE clear\n"); +#ifndef CONFIG_RISCV pte = __pte(pte_val(pte) | RANDOM_ORVALUE); +#endif set_pte_at(mm, vaddr, ptep, pte); barrier(); pte_clear(mm, vaddr, ptep);