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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2024-03-21 17:24:39 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-04-26 06:55:59 +0300 |
| commit | b7b098cf00a2b65d5654a86dc8edf82f125289c1 (patch) | |
| tree | fb38a5cbb30ce4eb6ab9f8abaf3d2b280ab01e2c /mm/internal.h | |
| parent | 3b89ec41747a6b6b8c7b6ad4fe13e063cb6dfe7f (diff) | |
| download | linux-b7b098cf00a2b65d5654a86dc8edf82f125289c1.tar.xz | |
mm: always initialise folio->_deferred_list
Patch series "Various significant MM patches".
These patches all interact in annoying ways which make it tricky to send
them out in any way other than a big batch, even though there's not really
an overarching theme to connect them.
The big effects of this patch series are:
- folio_test_hugetlb() becomes reliable, even when called without a
page reference
- We free up PG_slab, and we could always use more page flags
- We no longer need to check PageSlab before calling page_mapcount()
This patch (of 9):
For compound pages which are at least order-2 (and hence have a
deferred_list), initialise it and then we can check at free that the page
is not part of a deferred list. We recently found this useful to rule out
a source of corruption.
[peterx@redhat.com: always initialise folio->_deferred_list]
Link: https://lkml.kernel.org/r/20240417211836.2742593-2-peterx@redhat.com
Link: https://lkml.kernel.org/r/20240321142448.1645400-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20240321142448.1645400-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h index 85c3db43454d..5c0c57c9cd19 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -525,6 +525,8 @@ static inline void prep_compound_head(struct page *page, unsigned int order) atomic_set(&folio->_entire_mapcount, -1); atomic_set(&folio->_nr_pages_mapped, 0); atomic_set(&folio->_pincount, 0); + if (order > 1) + INIT_LIST_HEAD(&folio->_deferred_list); } static inline void prep_compound_tail(struct page *head, int tail_idx) |