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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-01-06 16:46:43 -0500 |
|---|---|---|
| committer | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-03-21 12:56:35 -0400 |
| commit | 5232c63f46fdd779303527ec36c518cc1e9c6b4e (patch) | |
| tree | 86a2005fadd461b81c8f9db76ea33e5bcf634ff6 /mm/rmap.c | |
| parent | 6315d8a23ce308433cf615e435ca2ee2aee7d11c (diff) | |
| download | linux-stable-5232c63f46fdd779303527ec36c518cc1e9c6b4e.tar.gz linux-stable-5232c63f46fdd779303527ec36c518cc1e9c6b4e.tar.bz2 linux-stable-5232c63f46fdd779303527ec36c518cc1e9c6b4e.zip | |
mm: Make compound_pincount always available
Move compound_pincount from the third page to the second page, which
means it's available for all compound pages. That lets us delete
hpage_pincount_available().
On 32-bit systems, there isn't enough space for both compound_pincount
and compound_nr in the second page (it would collide with page->private,
which is in use for pages in the swap cache), so revert the optimisation
of storing both compound_order and compound_nr on 32-bit systems.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index c7921c102bc0..1a13d5d6cfc7 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1219,8 +1219,7 @@ void page_add_new_anon_rmap(struct page *page, VM_BUG_ON_PAGE(!PageTransHuge(page), page); /* increment count (starts at -1) */ atomic_set(compound_mapcount_ptr(page), 0); - if (hpage_pincount_available(page)) - atomic_set(compound_pincount_ptr(page), 0); + atomic_set(compound_pincount_ptr(page), 0); __mod_lruvec_page_state(page, NR_ANON_THPS, nr); } else { @@ -2353,8 +2352,7 @@ void hugepage_add_new_anon_rmap(struct page *page, { BUG_ON(address < vma->vm_start || address >= vma->vm_end); atomic_set(compound_mapcount_ptr(page), 0); - if (hpage_pincount_available(page)) - atomic_set(compound_pincount_ptr(page), 0); + atomic_set(compound_pincount_ptr(page), 0); __page_set_anon_rmap(page, vma, address, 1); } |