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Tue, 16 Jun 2026 12:40:39 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav04.fra02v.mail.ibm.com (Postfix) with SMTP; Tue, 16 Jun 2026 12:40:39 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 55669) id 8BEC9E0E1E; Tue, 16 Jun 2026 14:40:39 +0200 (CEST) From: Alexander Gordeev To: Gerald Schaefer , Heiko Carstens , Christian Borntraeger , Vasily Gorbik , Claudio Imbrenda Cc: linux-s390@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Kevin Brodsky , David Hildenbrand Subject: [PATCH v3 5/7] mm/page_vma_mapped_walk: Use ptep_get_lockless() for lockless access Date: Tue, 16 Jun 2026 14:40:37 +0200 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE2MDEyNSBTYWx0ZWRfX/Ypv2WHkF2A3 sA0oiw0tb6vFWOLpuwo5nZwkAQSvBqFptBbmS2uUTmqVIcIJIfFMGOD5j5e7bOK0ERQPvIZp1hp qHfP5AInrBkmKklH57qJKcM1vp4wLEc= X-Proofpoint-GUID: 6223MHGd5ykmuWhXSeUqz0zY0EG3vuEj X-Authority-Analysis: v=2.4 cv=SY/HsPRu c=1 sm=1 tr=0 ts=6a31444e cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=r6uuodyqXXh6h6eviuwA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE2MDEyNSBTYWx0ZWRfX4JH852LYS1Ai bcBrYc4FnNNpyn1lp8W06jsryyzncZoO9Uu0krDwPiMWWBs13/gwsNZ60fsaErII0RvlKIx5ftF MDAuZDUDWi9l1ADDlN8W/Q89eRis4PaOzYti2kgphA1p1Am9nJ0PtWSkgtw8SBQl0Y8ewG9z5Ed RBTCpl2LV6l7+ODvFfUTP7d+4p1RfJ94+aAO2C7zQr0YRywtIFkiYtTEXmEbOnDkGOCcQ2A6v0p xyD6D/MD1tVM8M/Izmxbu1vja4nbKFgCQyRSo7jkQl4Z8tgGnATUAsL8bsci/2EHr72o+9r/+vw EJjP44zCkZYygh/tEugLP99VBnsDdvopKBK+KrUi6KfVJv70Wqc0GXhfSxv4Mva15QxZi8dBYRq enloDDHKWOfw0CTz6TY9y9CrdLahV4GPQGsSWmugm0winYikFACMIU7F8OlucPuLu7/s366e9U9 NuFKl5Je1MFzQjUHb2Q== X-Proofpoint-ORIG-GUID: 6223MHGd5ykmuWhXSeUqz0zY0EG3vuEj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-16_03,2026-06-15_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 phishscore=0 suspectscore=0 spamscore=0 impostorscore=0 malwarescore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606040000 definitions=main-2606160125 Switch from ptep_get() to ptep_get_lockless() accessor for PTE reads when no lock is taken. Signed-off-by: Alexander Gordeev --- mm/page_vma_mapped.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index a4d52fdb3056..2ccbabfb2cc1 100644 --- a/mm/page_vma_mapped.c +++ b/mm/page_vma_mapped.c @@ -41,7 +41,7 @@ static bool map_pte(struct page_vma_mapped_walk *pvmw, = pmd_t *pmdvalp, if (!pvmw->pte) return false; =20 - ptent =3D ptep_get(pvmw->pte); + ptent =3D ptep_get_lockless(pvmw->pte); =20 if (pte_none(ptent)) { return false; @@ -183,6 +183,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk= *pvmw) struct mm_struct *mm =3D vma->vm_mm; unsigned long end; spinlock_t *ptl; + pte_t pteval; pgd_t *pgd; p4d_t *p4d; pud_t *pud; @@ -310,7 +311,11 @@ bool page_vma_mapped_walk(struct page_vma_mapped_wal= k *pvmw) goto restart; } pvmw->pte++; - } while (pte_none(ptep_get(pvmw->pte))); + if (!pvmw->ptl) + pteval =3D ptep_get_lockless(pvmw->pte); + else + pteval =3D ptep_get(pvmw->pte); + } while (pte_none(pteval)); =20 if (!pvmw->ptl) { spin_lock(ptl); --=20 2.53.0