From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
David Rientjes <rientjes@google.com>,
Shakeel Butt <shakeelb@google.com>,
John Hubbard <jhubbard@nvidia.com>,
Jason Gunthorpe <jgg@nvidia.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Yang Shi <shy828301@gmail.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Matthew Wilcox <willy@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>, Jann Horn <jannh@google.com>,
Michal Hocko <mhocko@kernel.org>, Nadav Amit <namit@vmware.com>,
Rik van Riel <riel@surriel.com>, Roman Gushchin <guro@fb.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Peter Xu <peterx@redhat.com>, Donald Dutile <ddutile@redhat.com>,
Christoph Hellwig <hch@lst.de>, Oleg Nesterov <oleg@redhat.com>,
Jan Kara <jack@suse.cz>, Liang Zhang <zhangliang5@huawei.com>,
Pedro Gomes <pedrodemargomes@gmail.com>,
Oded Gabbay <oded.gabbay@gmail.com>,
linux-mm@kvack.org, David Hildenbrand <david@redhat.com>
Subject: [PATCH v3 10/16] mm/huge_memory: remove outdated VM_WARN_ON_ONCE_PAGE from unmap_page()
Date: Tue, 29 Mar 2022 18:04:34 +0200 [thread overview]
Message-ID: <20220329160440.193848-11-david@redhat.com> (raw)
In-Reply-To: <20220329160440.193848-1-david@redhat.com>
We can already theoretically fail to unmap (still having page_mapped()) in
case arch_unmap_one() fails, which can happen on sparc. Failures to
unmap are handled gracefully, just as if there are other references on
the target page: freezing the refcount in split_huge_page_to_list()
will fail if still mapped and we'll simply remap.
In commit 504e070dc08f ("mm: thp: replace DEBUG_VM BUG with VM_WARN when
unmap fails for split") we already converted to VM_WARN_ON_ONCE_PAGE,
let's get rid of it completely now.
This is a preparation for making try_to_migrate() fail on anonymous pages
with GUP pins, which will make this VM_WARN_ON_ONCE_PAGE trigger more
frequently.
Reported-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
mm/huge_memory.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index dd16819c5edc..70298431e128 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2241,8 +2241,6 @@ static void unmap_page(struct page *page)
try_to_migrate(folio, ttu_flags);
else
try_to_unmap(folio, ttu_flags | TTU_IGNORE_MLOCK);
-
- VM_WARN_ON_ONCE_PAGE(page_mapped(page), page);
}
static void remap_page(struct folio *folio, unsigned long nr)
--
2.35.1
next prev parent reply other threads:[~2022-03-29 16:06 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-29 16:04 [PATCH v3 00/16] mm: COW fixes part 2: reliable GUP pins of anonymous pages David Hildenbrand
2022-03-29 16:04 ` [PATCH v3 01/16] mm/rmap: fix missing swap_free() in try_to_unmap() after arch_unmap_one() failed David Hildenbrand
2022-04-11 16:04 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 02/16] mm/hugetlb: take src_mm->write_protect_seq in copy_hugetlb_page_range() David Hildenbrand
2022-04-11 16:15 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 03/16] mm/memory: slightly simplify copy_present_pte() David Hildenbrand
2022-04-11 16:38 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 04/16] mm/rmap: split page_dup_rmap() into page_dup_file_rmap() and page_try_dup_anon_rmap() David Hildenbrand
2022-04-11 18:18 ` Vlastimil Babka
2022-04-12 8:06 ` David Hildenbrand
2022-03-29 16:04 ` [PATCH v3 05/16] mm/rmap: convert RMAP flags to a proper distinct rmap_t type David Hildenbrand
2022-04-12 8:11 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 06/16] mm/rmap: remove do_page_add_anon_rmap() David Hildenbrand
2022-04-12 8:13 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 07/16] mm/rmap: pass rmap flags to hugepage_add_anon_rmap() David Hildenbrand
2022-04-12 8:37 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 08/16] mm/rmap: drop "compound" parameter from page_add_new_anon_rmap() David Hildenbrand
2022-04-12 8:47 ` Vlastimil Babka
2022-04-12 9:37 ` David Hildenbrand
2022-04-13 12:26 ` Matthew Wilcox
2022-04-13 12:28 ` David Hildenbrand
2022-04-13 12:48 ` Matthew Wilcox
2022-04-13 16:20 ` David Hildenbrand
2022-03-29 16:04 ` [PATCH v3 09/16] mm/rmap: use page_move_anon_rmap() when reusing a mapped PageAnon() page exclusively David Hildenbrand
2022-04-12 9:26 ` Vlastimil Babka
2022-04-12 9:28 ` David Hildenbrand
2022-03-29 16:04 ` David Hildenbrand [this message]
2022-04-12 9:37 ` [PATCH v3 10/16] mm/huge_memory: remove outdated VM_WARN_ON_ONCE_PAGE from unmap_page() Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 11/16] mm/page-flags: reuse PG_mappedtodisk as PG_anon_exclusive for PageAnon() pages David Hildenbrand
2022-04-13 8:25 ` Vlastimil Babka
2022-04-13 10:28 ` David Hildenbrand
2022-04-13 14:55 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 12/16] mm: remember exclusively mapped anonymous pages with PG_anon_exclusive David Hildenbrand
2022-04-13 16:28 ` Vlastimil Babka
2022-04-13 16:39 ` David Hildenbrand
2022-04-13 18:28 ` Vlastimil Babka
2022-04-19 16:46 ` David Hildenbrand
2022-04-13 18:29 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 13/16] mm/gup: disallow follow_page(FOLL_PIN) David Hildenbrand
2022-04-14 15:18 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 14/16] mm: support GUP-triggered unsharing of anonymous pages David Hildenbrand
2022-04-14 17:15 ` Vlastimil Babka
2022-04-19 16:29 ` David Hildenbrand
2022-04-19 16:31 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 15/16] mm/gup: trigger FAULT_FLAG_UNSHARE when R/O-pinning a possibly shared anonymous page David Hildenbrand
2022-04-19 15:56 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 16/16] mm/gup: sanity-check with CONFIG_DEBUG_VM that anonymous pages are exclusive when (un)pinning David Hildenbrand
2022-04-19 17:40 ` Vlastimil Babka
2022-04-21 9:15 ` David Hildenbrand
2022-04-22 6:54 ` Vlastimil Babka
2022-03-29 16:09 ` [PATCH v3 00/16] mm: COW fixes part 2: reliable GUP pins of anonymous pages David Hildenbrand
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