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mm: add pmd_folio()

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Convert directly from a pmd to a folio without going through another
representation first.  For now this is just a slightly shorter way to
write it, but it might end up being more efficient later.

Link: https://lkml.kernel.org/r/20240326202833.523759-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-03-26 20:28:23 +00:00 committed by Andrew Morton
parent 5beaee54a3
commit e06d03d559
6 changed files with 9 additions and 7 deletions
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2
include/linux/pgtable.h
View file

@ -50,6 +50,8 @@
#define pmd_pgtable(pmd) pmd_page(pmd)
#endif
#define pmd_folio(pmd) page_folio(pmd_page(pmd))
/*
* A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD]
*

6
mm/huge_memory.c
View file

@ -1816,7 +1816,7 @@ bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
goto out;
}
folio = pfn_folio(pmd_pfn(orig_pmd));
folio = pmd_folio(orig_pmd);
/*
* If other processes are mapping this folio, we couldn't discard
* the folio unless they all do MADV_FREE so let's skip the folio.
@ -2086,7 +2086,7 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (pmd_protnone(*pmd))
goto unlock;
folio = page_folio(pmd_page(*pmd));
folio = pmd_folio(*pmd);
toptier = node_is_toptier(folio_nid(folio));
/*
* Skip scanning top tier node if normal numa
@ -2663,7 +2663,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
* It's safe to call pmd_page when folio is set because it's
* guaranteed that pmd is present.
*/
if (folio && folio != page_folio(pmd_page(*pmd)))
if (folio && folio != pmd_folio(*pmd))
goto out;
__split_huge_pmd_locked(vma, pmd, range.start, freeze);
}

2
mm/madvise.c
View file

@ -363,7 +363,7 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
goto huge_unlock;
}
folio = pfn_folio(pmd_pfn(orig_pmd));
folio = pmd_folio(orig_pmd);
/* Do not interfere with other mappings of this folio */
if (folio_likely_mapped_shared(folio))

2
mm/mempolicy.c
View file

@ -509,7 +509,7 @@ static void queue_folios_pmd(pmd_t *pmd, struct mm_walk *walk)
qp->nr_failed++;
return;
}
folio = pfn_folio(pmd_pfn(*pmd));
folio = pmd_folio(*pmd);
if (is_huge_zero_folio(folio)) {
walk->action = ACTION_CONTINUE;
return;

2
mm/mlock.c
View file

@ -378,7 +378,7 @@ static int mlock_pte_range(pmd_t *pmd, unsigned long addr,
goto out;
if (is_huge_zero_pmd(*pmd))
goto out;
folio = page_folio(pmd_page(*pmd));
folio = pmd_folio(*pmd);
if (vma->vm_flags & VM_LOCKED)
mlock_folio(folio);
else

2
mm/userfaultfd.c
View file

@ -1662,7 +1662,7 @@ ssize_t move_pages(struct userfaultfd_ctx *ctx, unsigned long dst_start,
/* Check if we can move the pmd without splitting it. */
if (move_splits_huge_pmd(dst_addr, src_addr, src_start + len) ||
!pmd_none(dst_pmdval)) {
struct folio *folio = pfn_folio(pmd_pfn(*src_pmd));
struct folio *folio = pmd_folio(*src_pmd);
if (!folio || (!is_huge_zero_folio(folio) &&
!PageAnonExclusive(&folio->page))) {