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mm/gup: drop nth_page() usage within folio when recording subpages

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nth_page() is no longer required when iterating over pages within a single
folio, so let's just drop it when recording subpages.

Link: https://lkml.kernel.org/r/20250901150359.867252-19-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2025-09-01 17:03:39 +02:00 • committed by Andrew Morton
parent 1a55ac6068
commit 541541dbfe
1 changed files with 3 additions and 4 deletions
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7
mm/gup.c
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@ -488,12 +488,11 @@ static int record_subpages(struct page *page, unsigned long sz,
unsigned long addr, unsigned long end,
struct page **pages)
{
struct page *start_page;
int nr;
start_page = nth_page(page, (addr & (sz - 1)) >> PAGE_SHIFT);
page += (addr & (sz - 1)) >> PAGE_SHIFT;
for (nr = 0; addr != end; nr++, addr += PAGE_SIZE)
pages[nr] = nth_page(start_page, nr);
pages[nr] = page++;
return nr;
}
@ -1512,7 +1511,7 @@ next_page:
}
for (j = 0; j < page_increm; j++) {
subpage = nth_page(page, j);
subpage = page + j;
pages[i + j] = subpage;
flush_anon_page(vma, subpage, start + j * PAGE_SIZE);
flush_dcache_page(subpage);