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Mon, 4 May 2026 13:04:34 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 55669) id 31603E0BD8; Mon, 04 May 2026 15:04:34 +0200 (CEST) From: Alexander Gordeev To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Anshuman Khandual , Oscar Salvador Cc: linux-s390@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Gerald Schaefer , Heiko Carstens , Vasily Gorbik Subject: [PATCH v2] mm/page_vma_mapped_walk: Use ptep_get_lockless() for lockless access Date: Mon, 4 May 2026 15:04:34 +0200 Message-ID: <20260504130434.2285053-1-agordeev@linux.ibm.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-s390@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-Details-Enc: AW1haW4tMjYwNTA0MDEzNCBTYWx0ZWRfXxv4MVpWLQ7+4 opdcsqJrR0GT7NRlU9JzyOPcWPqDpek8+IcJy7P7LDtKJe5m/zVJgjkNfeIRL2p6cgSkXCFd0v0 OInNujcUlcNhR3J0Jp+6K7NiUXJbI3TjTTFDU5AuYziBDJgQ/buOteS7eG/YXMsqOAZhkifs/E4 2CYI+VqWfpYE0poyYtke+/kINrKOkheB60+7Mv5hUjHaZuj0ffjy0AlGzKLQOXF/PC0w/NidVO2 TYvp9itY/1XppDwgFXk9F8y/eZhJ6PCfjuIyhhLKdgfxW7vMrt41zugrK2tB7aQptxCGAL2K5OT Yn/i1a+E4Gxn7gnT+zaxuRzrmkZlwXsf+TPuoEggculwXivOOfQsMBNYJ+MvyHhlnTqGL9UouIX AybfzTYttrBJzFPzTE+RsXDy3PkPr1fQN+mFdyTYWPtUBnWoZ5GByM28Td+umc6Fvn+iQ8XB3TR g4jTy+3TDbYvMGbZI+g== X-Proofpoint-GUID: WeqN-du5uoGuTeZAEmDisiPRQdC4IUAs X-Proofpoint-ORIG-GUID: WeqN-du5uoGuTeZAEmDisiPRQdC4IUAs X-Authority-Analysis: v=2.4 cv=eu/vCIpX c=1 sm=1 tr=0 ts=69f89966 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=8KbNvkZQz-Byi51b31MA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-04_04,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 clxscore=1011 adultscore=0 suspectscore=0 malwarescore=0 bulkscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605040134 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 | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index a4d52fdb3056..6559e17f11c2 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; @@ -310,7 +310,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk= *pvmw) goto restart; } pvmw->pte++; - } while (pte_none(ptep_get(pvmw->pte))); + } while (pte_none(ptep_get_lockless(pvmw->pte))); =20 if (!pvmw->ptl) { spin_lock(ptl); --=20 2.51.0