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Wed, 12 Aug 2020 06:34:37 +0000 (GMT) Received: from skywalker.ibmuc.com (unknown [9.85.71.109]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 12 Aug 2020 06:34:37 +0000 (GMT) From: "Aneesh Kumar K.V" To: linux-mm@kvack.org, akpm@linux-foundation.org Subject: [PATCH 08/16] debug_vm_pgtable/set_pmd: Don't use set_pmd_at to update an existing pmd entry Date: Wed, 12 Aug 2020 12:03:50 +0530 Message-Id: <20200812063358.369514-8-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200812063358.369514-1-aneesh.kumar@linux.ibm.com> References: <20200812063358.369514-1-aneesh.kumar@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-08-11_19:2020-08-11, 2020-08-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 malwarescore=0 adultscore=0 phishscore=0 impostorscore=0 mlxlogscore=674 lowpriorityscore=0 clxscore=1015 mlxscore=0 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008120044 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, "Aneesh Kumar K.V" , Anshuman Khandual Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" set_pmd_at() should not be used to set a pte entry at locations that already holds a valid pte entry. Architectures like ppc64 don't do TLB invalidate in set_pmd_at() and hence expect it to be used to set locations that are not a valid PTE. Signed-off-by: Aneesh Kumar K.V --- mm/debug_vm_pgtable.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index cd609a212dd4..60bf876081b8 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -164,8 +164,6 @@ static void __init pmd_advanced_tests(struct mm_struct *mm, pmd = READ_ONCE(*pmdp); WARN_ON(pmd_write(pmd)); - pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); - set_pmd_at(mm, vaddr, pmdp, pmd); pmdp_huge_get_and_clear(mm, vaddr, pmdp); pmd = READ_ONCE(*pmdp); WARN_ON(!pmd_none(pmd)); @@ -180,12 +178,11 @@ static void __init pmd_advanced_tests(struct mm_struct *mm, pmd = READ_ONCE(*pmdp); WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); - pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); - set_pmd_at(mm, vaddr, pmdp, pmd); pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1); pmd = READ_ONCE(*pmdp); WARN_ON(!pmd_none(pmd)); + pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); pmd = pmd_mkyoung(pmd); set_pmd_at(mm, vaddr, pmdp, pmd); pmdp_test_and_clear_young(vma, vaddr, pmdp); -- 2.26.2