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Thu, 15 Oct 2020 03:32:14 +0000 (GMT) From: "Aneesh Kumar K.V" To: linux-mm@kvack.org, linux-riscv@lists.infradead.org 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201014_233223_777601_9178CC4A X-CRM114-Status: GOOD ( 18.21 ) X-Spam-Score: -0.8 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.8 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [148.163.158.5 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [148.163.158.5 listed in wl.mailspike.net] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Aneesh Kumar K.V" , akpm@linux-foundation.org, Anshuman Khandual Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org 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);