From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: "David Hildenbrand" <david@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Hugh Dickins" <hughd@google.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Christian Brauner" <brauner@kernel.org>
Cc: "Lorenzo Stoakes" <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Mike Rapoport" <rppt@kernel.org>,
"Suren Baghdasaryan" <surenb@google.com>,
"Michal Hocko" <mhocko@suse.com>,
"Rik van Riel" <riel@surriel.com>,
"Harry Yoo" <harry.yoo@oracle.com>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Shakeel Butt" <shakeel.butt@linux.dev>,
"Baolin Wang" <baolin.wang@linux.alibaba.com>,
"Darrick J. Wong" <djwong@kernel.org>,
"Dave Chinner" <david@fromorbit.com>,
linux-mm <linux-mm@kvack.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-kernel@vger.kernel.org, "Kiryl Shutsemau" <kas@kernel.org>
Subject: Re: [PATCHv2 1/2] mm/memory: Do not populate page table entries beyond i_size
Date: Fri, 24 Oct 2025 20:32:36 +0100 [thread overview]
Message-ID: <ca03ba53-388d-4ac4-abf3-062dcdf6ff00@app.fastmail.com> (raw)
In-Reply-To: <18262e42-9686-43c1-8f5f-0595b5a00de1@redhat.com>
On Fri, Oct 24, 2025, at 16:42, David Hildenbrand wrote:
> On 23.10.25 11:32, Kiryl Shutsemau wrote:
>> addr0 = addr - start * PAGE_SIZE;
>> if (folio_within_vma(folio, vmf->vma) &&
>> - (addr0 & PMD_MASK) == ((addr0 + folio_size(folio) - 1) & PMD_MASK)) {
>> + (addr0 & PMD_MASK) == ((addr0 + folio_size(folio) - 1) & PMD_MASK) &&
>
> Isn't this just testing whether addr0 is aligned to folio_size(folio)?
> (given that we don't support folios > PMD_SIZE), like
>
> IS_ALIGNED(addr0, folio_size(folio))
Actually, no. VMA can be not aligned to folio_size().
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2025-10-24 19:33 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-23 9:32 [PATCHv2 0/2] Fix SIGBUS semantics with large folios Kiryl Shutsemau
2025-10-23 9:32 ` [PATCHv2 1/2] mm/memory: Do not populate page table entries beyond i_size Kiryl Shutsemau
2025-10-23 20:49 ` Andrew Morton
2025-10-23 20:54 ` David Hildenbrand
2025-10-23 21:36 ` Andrew Morton
2025-10-24 9:26 ` Kiryl Shutsemau
2025-10-26 4:54 ` Andrew Morton
2025-10-24 15:42 ` David Hildenbrand
2025-10-24 19:32 ` Kirill A. Shutemov [this message]
2025-10-27 9:34 ` David Hildenbrand
2025-10-27 8:20 ` Hugh Dickins
2025-10-27 9:14 ` Kiryl Shutsemau
2025-10-27 9:22 ` David Hildenbrand
2025-10-29 8:31 ` Hugh Dickins
2025-10-29 10:11 ` Kiryl Shutsemau
2025-10-30 5:59 ` Hugh Dickins
2025-10-30 17:08 ` Kiryl Shutsemau
2025-10-23 9:32 ` [PATCHv2 2/2] mm/truncate: Unmap large folio on split failure Kiryl Shutsemau
2025-10-23 20:56 ` Andrew Morton
2025-10-24 9:05 ` Kiryl Shutsemau
2025-10-24 15:43 ` David Hildenbrand
2025-10-27 10:10 ` Hugh Dickins
2025-10-27 10:38 ` David Hildenbrand
2025-10-27 10:40 ` Kiryl Shutsemau
2025-10-29 9:12 ` Hugh Dickins
2025-10-29 10:21 ` Kiryl Shutsemau
2025-10-29 15:19 ` Darrick J. Wong
2025-10-29 17:10 ` Kiryl Shutsemau
2025-10-23 17:47 ` [PATCHv2 0/2] Fix SIGBUS semantics with large folios Darrick J. Wong
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