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authorMatthew Wilcox (Oracle) <willy@infradead.org>2022-01-06 16:46:43 -0500
committerMatthew Wilcox (Oracle) <willy@infradead.org>2022-03-21 12:56:35 -0400
commit5232c63f46fdd779303527ec36c518cc1e9c6b4e (patch)
tree86a2005fadd461b81c8f9db76ea33e5bcf634ff6 /mm/rmap.c
parent6315d8a23ce308433cf615e435ca2ee2aee7d11c (diff)
downloadlinux-5232c63f46fdd779303527ec36c518cc1e9c6b4e.tar.bz2
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.c6
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);
}