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Thu, 27 Aug 2020 08:05:53 +0000 (GMT) Received: from skywalker.ibmuc.com (unknown [9.102.17.9]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 27 Aug 2020 08:05:53 +0000 (GMT) From: "Aneesh Kumar K.V" To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, Anshuman Khandual , linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-snps-arc@lists.infradead.org, x86@kernel.org, linux-arch@vger.kernel.org, Gerald Schaefer , Christophe Leroy , Vineet Gupta , Mike Rapoport , Qian Cai , "Aneesh Kumar K.V" Subject: [PATCH v3 13/13] mm/debug_vm_pgtable: populate a pte entry before fetching it Date: Thu, 27 Aug 2020 13:34:38 +0530 Message-Id: <20200827080438.315345-14-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200827080438.315345-1-aneesh.kumar@linux.ibm.com> References: <20200827080438.315345-1-aneesh.kumar@linux.ibm.com> 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=2020-08-27_02:2020-08-27,2020-08-27 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 malwarescore=0 clxscore=1015 adultscore=0 priorityscore=1501 spamscore=0 lowpriorityscore=0 mlxscore=0 suspectscore=0 bulkscore=0 mlxlogscore=946 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008270057 X-Rspamd-Queue-Id: CD42B1AD1B9 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 Content-Transfer-Encoding: quoted-printable 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: pte_clear_tests operate on an existing pte entry. Make sure that is not a= none pte entry. Signed-off-by: Aneesh Kumar K.V --- mm/debug_vm_pgtable.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 21329c7d672f..8527ebb75f2c 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -546,7 +546,7 @@ static void __init pgd_populate_tests(struct mm_struc= t *mm, pgd_t *pgdp, static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, unsigned long vaddr) { - pte_t pte =3D ptep_get(ptep); + pte_t pte =3D ptep_get_and_clear(mm, vaddr, ptep); =20 pr_debug("Validating PTE clear\n"); pte =3D __pte(pte_val(pte) | RANDOM_ORVALUE); @@ -944,7 +944,7 @@ static int __init debug_vm_pgtable(void) p4d_t *p4dp, *saved_p4dp; pud_t *pudp, *saved_pudp; pmd_t *pmdp, *saved_pmdp, pmd; - pte_t *ptep; + pte_t *ptep, pte; pgtable_t saved_ptep; pgprot_t prot, protnone; phys_addr_t paddr; @@ -1049,6 +1049,8 @@ static int __init debug_vm_pgtable(void) */ =20 ptep =3D pte_alloc_map_lock(mm, pmdp, vaddr, &ptl); + pte =3D pfn_pte(pte_aligned, prot); + set_pte_at(mm, vaddr, ptep, pte); pte_clear_tests(mm, ptep, vaddr); pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); pte_unmap_unlock(ptep, ptl); --=20 2.26.2