From patchwork Wed Aug 12 06:33:55 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: 11710331 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 65C24109B for ; Wed, 12 Aug 2020 06:35:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 27E9420768 for ; Wed, 12 Aug 2020 06:35:05 +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="DfYPgv4S" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 27E9420768 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 772FD8D0010; Wed, 12 Aug 2020 02:35:03 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 6FD978D0001; Wed, 12 Aug 2020 02:35:03 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5C5338D0010; Wed, 12 Aug 2020 02:35:03 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0206.hostedemail.com [216.40.44.206]) by kanga.kvack.org (Postfix) with ESMTP id 3E5378D0001 for ; Wed, 12 Aug 2020 02:35:03 -0400 (EDT) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 02C54181AEF1A for ; Wed, 12 Aug 2020 06:35:03 +0000 (UTC) X-FDA: 77140954086.07.cow27_3e17a2326fe9 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin07.hostedemail.com (Postfix) with ESMTP id BCF921803F9B2 for ; Wed, 12 Aug 2020 06:35:02 +0000 (UTC) X-Spam-Summary: 1,0,0,5b39307f87c6f2b6,d41d8cd98f00b204,aneesh.kumar@linux.ibm.com,,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1261:1311:1314:1345:1359:1431:1437:1515:1535:1541:1711:1730:1747:1777:1792:2393:2559:2562:3138:3139:3140:3141:3142:3352:3865:3867:5007:6119:6261:6653:7903:8634:10004:11026:11658:11914:12043:12114:12296:12297:12438:12555:12895:13069:13255:13311:13357:13894:14096:14181:14384:14394:14721:21080:21451:21627:30054,0,RBL:148.163.156.1:@linux.ibm.com:.lbl8.mailshell.net-64.100.201.201 62.2.0.100;04y8g1o5dm71qb7qfuu1xqgtjngn7yc6ygtnsn6d6ahfqikg7wfcz1ajr9msnig.1bgkik5ghtyugf9nj18u8kurn1byz38m9rhu7kt8wfgkwsrhtcqy94gn9otzn3z.a-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: cow27_3e17a2326fe9 X-Filterd-Recvd-Size: 5292 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by imf50.hostedemail.com (Postfix) with ESMTP for ; Wed, 12 Aug 2020 06:35:02 +0000 (UTC) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 07C6XBe8133004; Wed, 12 Aug 2020 02:34:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=uA4jz9gzKKTbBFabLzOV/2F1mMcHovsWhX7nppVLnIQ=; b=DfYPgv4SulXsFMPfheSOHBxtRS8xkvVP3TTU7CzwcXxB2RIym9C/biFKSawl3jsfnJvi p5kqGKAA0u17gwLpxgC6E/cOFrzbpWkD5fmXboo/sHhfZc2tvRlbaLQF29Fyiqz3C8h6 K+Oju6lxB5hrHYvD0ezXBbvUmuUDrQRbRZIkMvbJsSv//Zj1gl3cilIpidGP4IxJSiwX SnLbijofy4SpbevZrhNHoTmvL/dbet+tz6G0iXtqIKazGUAbhoNGoMq9O9cZi+SiqJWY L3n1bmvOc8p+PdinOVRHwNtthh1isvNzBYMYGfjVNF5acHoLyeYmuH70sdyKgaxk8DnZ gA== Received: from ppma02dal.us.ibm.com (a.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.10]) by mx0a-001b2d01.pphosted.com with ESMTP id 32v18464fh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Aug 2020 02:34:56 -0400 Received: from pps.filterd (ppma02dal.us.ibm.com [127.0.0.1]) by ppma02dal.us.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 07C6VFp7027950; Wed, 12 Aug 2020 06:34:55 GMT Received: from b03cxnp08028.gho.boulder.ibm.com (b03cxnp08028.gho.boulder.ibm.com [9.17.130.20]) by ppma02dal.us.ibm.com with ESMTP id 32skp9f8q4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Aug 2020 06:34:55 +0000 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 07C6YssJ37749222 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 12 Aug 2020 06:34:54 GMT Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5AE44136053; Wed, 12 Aug 2020 06:34:54 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EB44613604F; Wed, 12 Aug 2020 06:34:51 +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 06:34:51 +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 , "Aneesh Kumar K.V" Subject: [PATCH 13/16] debug_vm_pgtable/pmd_clear: Don't use pmd/pud_clear on pte entries Date: Wed, 12 Aug 2020 12:03:55 +0530 Message-Id: <20200812063358.369514-13-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 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 adultscore=0 bulkscore=0 priorityscore=1501 phishscore=0 impostorscore=0 suspectscore=0 clxscore=1015 malwarescore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 mlxlogscore=992 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008120044 X-Rspamd-Queue-Id: BCF921803F9B2 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 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: pmd_clear() should not be used to clear pmd level pte entries. Signed-off-by: Aneesh Kumar K.V --- mm/debug_vm_pgtable.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 061c19bba7f0..529892b9be2f 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -191,6 +191,8 @@ static void __init pmd_advanced_tests(struct mm_struct *mm, pmd = READ_ONCE(*pmdp); WARN_ON(pmd_young(pmd)); + /* Clear the pte entries */ + pmdp_huge_get_and_clear(mm, vaddr, pmdp); pgtable = pgtable_trans_huge_withdraw(mm, pmdp); } @@ -313,6 +315,8 @@ static void __init pud_advanced_tests(struct mm_struct *mm, pudp_test_and_clear_young(vma, vaddr, pudp); pud = READ_ONCE(*pudp); WARN_ON(pud_young(pud)); + + pudp_huge_get_and_clear(mm, vaddr, pudp); } static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) @@ -431,8 +435,6 @@ static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, * This entry points to next level page table page. * Hence this must not qualify as pud_bad(). */ - pmd_clear(pmdp); - pud_clear(pudp); pud_populate(mm, pudp, pmdp); pud = READ_ONCE(*pudp); WARN_ON(pud_bad(pud)); @@ -564,7 +566,6 @@ static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp, * This entry points to next level page table page. * Hence this must not qualify as pmd_bad(). */ - pmd_clear(pmdp); pmd_populate(mm, pmdp, pgtable); pmd = READ_ONCE(*pmdp); WARN_ON(pmd_bad(pmd));