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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Muchun Song , Oscar Salvador , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Axel Rasmussen , Yuanchu Xie , Wei Xu , Kemeng Shi , Kairui Song , Nhat Pham , Baoquan He , Chris Li , SeongJae Park , Matthew Wilcox , Jason Gunthorpe , Leon Romanovsky , Xu Xin , Chengming Zhou , Jann Horn , Miaohe Lin , Naoya Horiguchi , Pedro Falcato , Pasha Tatashin , Rik van Riel , Harry Yoo , Hugh Dickins , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, damon@lists.linux.dev Subject: [PATCH v2 16/16] mm: replace remaining pte_to_swp_entry() with softleaf_from_pte() Date: Sat, 8 Nov 2025 17:08:30 +0000 Message-ID: X-Mailer: git-send-email 2.51.0 In-Reply-To: References: 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invocations of pte_to_swp_entry() lying around, replace all of these with the software leaf entry equivalent - softleaf_from_pte(). With those removed, eliminate pte_to_swp_entry() altogether. No functional change intended. Signed-off-by: Lorenzo Stoakes --- include/linux/leafops.h | 7 ++++++- include/linux/swapops.h | 13 ------------- mm/debug_vm_pgtable.c | 2 +- mm/internal.h | 7 +++++-- mm/memory-failure.c | 2 +- mm/memory.c | 16 ++++++++-------- mm/migrate.c | 2 +- mm/mincore.c | 4 +++- mm/rmap.c | 8 ++++++-- mm/swapfile.c | 5 +++-- 10 files changed, 34 insertions(+), 32 deletions(-) diff --git a/include/linux/leafops.h b/include/linux/leafops.h index d593093ba70c..a464a7e08c76 100644 --- a/include/linux/leafops.h +++ b/include/linux/leafops.h @@ -54,11 +54,16 @@ static inline softleaf_t softleaf_mk_none(void) */ static inline softleaf_t softleaf_from_pte(pte_t pte) { + softleaf_t arch_entry; + if (pte_present(pte)) return softleaf_mk_none(); + pte = pte_swp_clear_flags(pte); + arch_entry = __pte_to_swp_entry(pte); + /* Temporary until swp_entry_t eliminated. */ - return pte_to_swp_entry(pte); + return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry)); } /** diff --git a/include/linux/swapops.h b/include/linux/swapops.h index 3d02b288c15e..8cfc966eae48 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -107,19 +107,6 @@ static inline pgoff_t swp_offset(swp_entry_t entry) return entry.val & SWP_OFFSET_MASK; } -/* - * Convert the arch-dependent pte representation of a swp_entry_t into an - * arch-independent swp_entry_t. - */ -static inline swp_entry_t pte_to_swp_entry(pte_t pte) -{ - swp_entry_t arch_entry; - - pte = pte_swp_clear_flags(pte); - arch_entry = __pte_to_swp_entry(pte); - return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry)); -} - /* * Convert the arch-independent representation of a swp_entry_t into the * arch-dependent pte representation. diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 64db85a80558..1eae87dbef73 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -1229,7 +1229,7 @@ static int __init init_args(struct pgtable_debug_args *args) init_fixed_pfns(args); /* See generic_max_swapfile_size(): probe the maximum offset */ - max_swap_offset = swp_offset(pte_to_swp_entry(swp_entry_to_pte(swp_entry(0, ~0UL)))); + max_swap_offset = swp_offset(softleaf_from_pte(softleaf_to_pte(swp_entry(0, ~0UL)))); /* Create a swp entry with all possible bits set while still being swap. */ args->swp_entry = swp_entry(MAX_SWAPFILES - 1, max_swap_offset); /* Create a non-present migration entry. */ diff --git a/mm/internal.h b/mm/internal.h index f0c7461bb02c..985605ba3364 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -334,7 +334,7 @@ unsigned int folio_pte_batch(struct folio *folio, pte_t *ptep, pte_t pte, */ static inline pte_t pte_move_swp_offset(pte_t pte, long delta) { - swp_entry_t entry = pte_to_swp_entry(pte); + const softleaf_t entry = softleaf_from_pte(pte); pte_t new = __swp_entry_to_pte(__swp_entry(swp_type(entry), (swp_offset(entry) + delta))); @@ -389,11 +389,14 @@ static inline int swap_pte_batch(pte_t *start_ptep, int max_nr, pte_t pte) cgroup_id = lookup_swap_cgroup_id(entry); while (ptep < end_ptep) { + softleaf_t entry; + pte = ptep_get(ptep); if (!pte_same(pte, expected_pte)) break; - if (lookup_swap_cgroup_id(pte_to_swp_entry(pte)) != cgroup_id) + entry = softleaf_from_pte(pte); + if (lookup_swap_cgroup_id(entry) != cgroup_id) break; expected_pte = pte_next_swp_offset(expected_pte); ptep++; diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 6e79da3de221..ca2204c4647e 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -50,7 +50,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/mm/memory.c b/mm/memory.c index accd275cd651..f9a2c608aff9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1218,7 +1218,7 @@ copy_pte_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma, spinlock_t *src_ptl, *dst_ptl; int progress, max_nr, ret = 0; int rss[NR_MM_COUNTERS]; - swp_entry_t entry = (swp_entry_t){0}; + softleaf_t entry = softleaf_mk_none(); struct folio *prealloc = NULL; int nr; @@ -1282,7 +1282,7 @@ copy_pte_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma, dst_vma, src_vma, addr, rss); if (ret == -EIO) { - entry = pte_to_swp_entry(ptep_get(src_pte)); + entry = softleaf_from_pte(ptep_get(src_pte)); break; } else if (ret == -EBUSY) { break; @@ -4456,13 +4456,13 @@ static struct folio *__alloc_swap_folio(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct folio *folio; - swp_entry_t entry; + softleaf_t entry; folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, vma, vmf->address); if (!folio) return NULL; - entry = pte_to_swp_entry(vmf->orig_pte); + entry = softleaf_from_pte(vmf->orig_pte); if (mem_cgroup_swapin_charge_folio(folio, vma->vm_mm, GFP_KERNEL, entry)) { folio_put(folio); @@ -4480,7 +4480,7 @@ static struct folio *__alloc_swap_folio(struct vm_fault *vmf) static bool can_swapin_thp(struct vm_fault *vmf, pte_t *ptep, int nr_pages) { unsigned long addr; - swp_entry_t entry; + softleaf_t entry; int idx; pte_t pte; @@ -4490,7 +4490,7 @@ static bool can_swapin_thp(struct vm_fault *vmf, pte_t *ptep, int nr_pages) if (!pte_same(pte, pte_move_swp_offset(vmf->orig_pte, -idx))) return false; - entry = pte_to_swp_entry(pte); + entry = softleaf_from_pte(pte); if (swap_pte_batch(ptep, nr_pages, pte) != nr_pages) return false; @@ -4536,7 +4536,7 @@ static struct folio *alloc_swap_folio(struct vm_fault *vmf) unsigned long orders; struct folio *folio; unsigned long addr; - swp_entry_t entry; + softleaf_t entry; spinlock_t *ptl; pte_t *pte; gfp_t gfp; @@ -4557,7 +4557,7 @@ static struct folio *alloc_swap_folio(struct vm_fault *vmf) if (!zswap_never_enabled()) goto fallback; - entry = pte_to_swp_entry(vmf->orig_pte); + entry = softleaf_from_pte(vmf->orig_pte); /* * Get a list of all the (large) orders below PMD_ORDER that are enabled * and suitable for swapping THP. diff --git a/mm/migrate.c b/mm/migrate.c index 182a5b7b2ead..c01bc0ddf819 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -534,7 +534,7 @@ void migration_entry_wait_huge(struct vm_area_struct *vma, unsigned long addr, p * lock release in migration_entry_wait_on_locked(). */ hugetlb_vma_unlock_read(vma); - migration_entry_wait_on_locked(pte_to_swp_entry(pte), ptl); + migration_entry_wait_on_locked(entry, ptl); return; } diff --git a/mm/mincore.c b/mm/mincore.c index e1d50f198c42..62c9603a5414 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -202,7 +202,9 @@ static int mincore_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, for (i = 0; i < step; i++) vec[i] = 1; } else { /* pte is a swap entry */ - *vec = mincore_swap(pte_to_swp_entry(pte), false); + const softleaf_t entry = softleaf_from_pte(pte); + + *vec = mincore_swap(entry, false); } vec += step; } diff --git a/mm/rmap.c b/mm/rmap.c index 345466ad396b..d871f2eb821c 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1969,7 +1969,9 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, if (likely(pte_present(pteval))) { pfn = pte_pfn(pteval); } else { - pfn = softleaf_to_pfn(pte_to_swp_entry(pteval)); + const softleaf_t entry = softleaf_from_pte(pteval); + + pfn = softleaf_to_pfn(entry); VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); } @@ -2368,7 +2370,9 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, if (likely(pte_present(pteval))) { pfn = pte_pfn(pteval); } else { - pfn = softleaf_to_pfn(pte_to_swp_entry(pteval)); + const softleaf_t entry = softleaf_from_pte(pteval); + + pfn = softleaf_to_pfn(entry); VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); } diff --git a/mm/swapfile.c b/mm/swapfile.c index 684f78cd7dd1..1204fb0726d5 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -3201,8 +3201,9 @@ static int claim_swapfile(struct swap_info_struct *si, struct inode *inode) */ unsigned long generic_max_swapfile_size(void) { - return swp_offset(pte_to_swp_entry( - swp_entry_to_pte(swp_entry(0, ~0UL)))) + 1; + const softleaf_t entry = swp_entry(0, ~0UL); + + return swp_offset(softleaf_from_pte(softleaf_to_pte(entry))) + 1; } /* Can be overridden by an architecture for additional checks. */ -- 2.51.0