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Bottomley" , Helge Deller , Juergen Gross , Stefano Stabellini , Muchun Song , Oscar Salvador , Andrew Morton , "Liam R. Howlett" , Lorenzo Stoakes , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , Andrey Ryabinin , David Hildenbrand , Pasha Tatashin , Chris Li , Kairui Song , Uladzislau Rezki , Steven Rostedt , Masami Hiramatsu , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , SJ Park , "Matthew Wilcox (Oracle)" , Jan Kara , Jason Gunthorpe , Leon Romanovsky , Miaohe Lin , Dennis Zhou , Tejun Heo , Christoph Lameter , Mike Rapoport , Johannes Weiner , ziy@nvidia.com, pfalcato@suse.de, ryan.roberts@arm.com, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-parisc@vger.kernel.org, xen-devel@lists.xenproject.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, kasan-dev@googlegroups.com, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, damon@lists.linux.dev Subject: Re: [PATCH RFC 07/11] mm/mremap: use ptep_get() for the destination PTE To: Alexander Gordeev References: <20260727164715.2866609-1-usama.anjum@arm.com> <20260727164715.2866609-8-usama.anjum@arm.com> <50dd77c0-b6cc-43e2-abd5-6d44a29b5597-agordeev@linux.ibm.com> From: Muhammad Usama Anjum Content-Language: en-US In-Reply-To: <50dd77c0-b6cc-43e2-abd5-6d44a29b5597-agordeev@linux.ibm.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: O0tk75Jwa84mlQCh/jghGzah7Zx4wyBrsFKWBapww83B2Rc5zJP6DKPrz2Uug6JPaPNE+9z2QJlnOBHI5eVJvoivlaP5RB0CDEgLDuDWcRD+uFLUl7J24b6Fh42l/El51riqiL/qx8KLaCiZ3QEA+zMCBEPyTCyleaxfiFROcNsSg7Y0+OwvImkIDS3t6ybum1bYLPDeEvQ/niHon1ljqZi8pGpTndyPvy9tSEgttv7Cwu5YZ0FINdmLMPGMOdm4dq6a5pPvgR0KIEK4XtfwADa29iGw+N9A5AaE3kjZpOuY2T60KxAgD44ofaWhiDmg/gIpQeLlQgG0eGkeGaAhv8dZj8ZlgZmaMiccf1N7/RZyq3/dv3uUyldCsqo3IFF21Ksrf85EBWTicCY/fo8/58SOakbPyIkgIp44+9WMgCZzxrQeA0gufUQ9J4l3XfkD X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jul 2026 13:00:31.6304 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2422e5ee-63ab-47d4-de99-08deee3a8993 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS1EPF00000049.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PR3PR08MB5609 On 30/07/2026 12:29 pm, Alexander Gordeev wrote: > On Mon, Jul 27, 2026 at 05:46:58PM +0100, Muhammad Usama Anjum wrote: >> move_ptes() directly dereferences new_ptep when checking that the >> destination slot is empty. new_ptep now points to hw_pte_t table storage, >> while pte_none() consumes a logical pte_t value. >> >> Read the destination entry through the standard ptep_get() accessor before >> passing the logical value to pte_none(). >> >> Signed-off-by: Muhammad Usama Anjum >> --- >> mm/mremap.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/mm/mremap.c b/mm/mremap.c >> index d966ee8248b6b..ecb90ccee6fdd 100644 >> --- a/mm/mremap.c >> +++ b/mm/mremap.c >> @@ -264,7 +264,7 @@ static int move_ptes(struct pagetable_move_control *pmc, >> >> for (; old_addr < old_end; old_ptep += nr_ptes, old_addr += nr_ptes * PAGE_SIZE, >> new_ptep += nr_ptes, new_addr += nr_ptes * PAGE_SIZE) { >> - VM_WARN_ON_ONCE(!pte_none(*new_ptep)); >> + VM_WARN_ON_ONCE(!pte_none(ptep_get(new_ptep))); > > Same as the previous patch, except that I did it already: > https://lore.kernel.org/linux-mm/20260720141633.501799-1-agordeev@linux.ibm.com/ I'll drop this patch. > >> >> nr_ptes = 1; >> max_nr_ptes = (old_end - old_addr) >> PAGE_SHIFT; >> -- >> 2.47.3 >> -- Thanks, Usama