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| author | David Hildenbrand <david@redhat.com> | 2023-12-20 23:44:26 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-12-29 11:58:47 -0800 |
| commit | e135826b2da0cf25305086dc9ac1e91718a148e1 (patch) | |
| tree | eaa4667b7fe695c264dff4985d25562bbc5080f1 /include/linux/rmap.h | |
| parent | 9d5fafd5d882446999366f673ab06edba453f862 (diff) | |
| download | linux-e135826b2da0cf25305086dc9ac1e91718a148e1.tar.gz linux-e135826b2da0cf25305086dc9ac1e91718a148e1.tar.bz2 linux-e135826b2da0cf25305086dc9ac1e91718a148e1.zip | |
mm/rmap: introduce and use hugetlb_remove_rmap()
hugetlb rmap handling differs quite a lot from "ordinary" rmap code. For
example, hugetlb currently only supports entire mappings, and treats any
mapping as mapped using a single "logical PTE". Let's move it out of the
way so we can overhaul our "ordinary" rmap. implementation/interface.
Let's introduce and use hugetlb_remove_rmap() and remove the hugetlb code
from page_remove_rmap(). This effectively removes one check on the
small-folio path as well.
Add sanity checks that we end up with the right folios in the right
functions.
Note: all possible candidates that need care are page_remove_rmap() that
pass compound=true.
Link: https://lkml.kernel.org/r/20231220224504.646757-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/rmap.h')
| -rw-r--r-- | include/linux/rmap.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 36096ba69bdc..64ae6c4d7272 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -211,6 +211,13 @@ void hugetlb_add_anon_rmap(struct folio *, struct vm_area_struct *, void hugetlb_add_new_anon_rmap(struct folio *, struct vm_area_struct *, unsigned long address); +static inline void hugetlb_remove_rmap(struct folio *folio) +{ + VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio); + + atomic_dec(&folio->_entire_mapcount); +} + static inline void __page_dup_rmap(struct page *page, bool compound) { if (compound) { |