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Message-ID: <20250901205021.3573313-11-max.kellermann@ionos.com>
Date: Mon, 1 Sep 2025 22:50:19 +0200
From: Max Kellermann <max.kellermann@...os.com>
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Subject: [PATCH v6 10/12] mm: constify various inline functions for improved const-correctness
We select certain test functions plus folio_migrate_refs() from
mm_inline.h which either invoke each other, functions that are already
const-ified, or no further functions.
It is therefore relatively trivial to const-ify them, which
provides a basis for further const-ification further up the call
stack.
One exception is the function folio_migrate_refs() which does write to
the "new" folio pointer; there, only the "old" folio pointer is being
constified; only its "flags" field is read, but nothing written.
Signed-off-by: Max Kellermann <max.kellermann@...os.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
include/linux/mm_inline.h | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 150302b4a905..d6c1011b38f2 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -25,7 +25,7 @@
* 0 if @folio is a normal anonymous folio, a tmpfs folio or otherwise
* ram or swap backed folio.
*/
-static inline int folio_is_file_lru(struct folio *folio)
+static inline int folio_is_file_lru(const struct folio *folio)
{
return !folio_test_swapbacked(folio);
}
@@ -84,7 +84,7 @@ static __always_inline void __folio_clear_lru_flags(struct folio *folio)
* Return: The LRU list a folio should be on, as an index
* into the array of LRU lists.
*/
-static __always_inline enum lru_list folio_lru_list(struct folio *folio)
+static __always_inline enum lru_list folio_lru_list(const struct folio *folio)
{
enum lru_list lru;
@@ -141,7 +141,7 @@ static inline int lru_tier_from_refs(int refs, bool workingset)
return workingset ? MAX_NR_TIERS - 1 : order_base_2(refs);
}
-static inline int folio_lru_refs(struct folio *folio)
+static inline int folio_lru_refs(const struct folio *folio)
{
unsigned long flags = READ_ONCE(folio->flags.f);
@@ -154,14 +154,14 @@ static inline int folio_lru_refs(struct folio *folio)
return ((flags & LRU_REFS_MASK) >> LRU_REFS_PGOFF) + 1;
}
-static inline int folio_lru_gen(struct folio *folio)
+static inline int folio_lru_gen(const struct folio *folio)
{
unsigned long flags = READ_ONCE(folio->flags.f);
return ((flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1;
}
-static inline bool lru_gen_is_active(struct lruvec *lruvec, int gen)
+static inline bool lru_gen_is_active(const struct lruvec *lruvec, int gen)
{
unsigned long max_seq = lruvec->lrugen.max_seq;
@@ -217,12 +217,13 @@ static inline void lru_gen_update_size(struct lruvec *lruvec, struct folio *foli
VM_WARN_ON_ONCE(lru_gen_is_active(lruvec, old_gen) && !lru_gen_is_active(lruvec, new_gen));
}
-static inline unsigned long lru_gen_folio_seq(struct lruvec *lruvec, struct folio *folio,
+static inline unsigned long lru_gen_folio_seq(const struct lruvec *lruvec,
+ const struct folio *folio,
bool reclaiming)
{
int gen;
int type = folio_is_file_lru(folio);
- struct lru_gen_folio *lrugen = &lruvec->lrugen;
+ const struct lru_gen_folio *lrugen = &lruvec->lrugen;
/*
* +-----------------------------------+-----------------------------------+
@@ -302,7 +303,7 @@ static inline bool lru_gen_del_folio(struct lruvec *lruvec, struct folio *folio,
return true;
}
-static inline void folio_migrate_refs(struct folio *new, struct folio *old)
+static inline void folio_migrate_refs(struct folio *new, const struct folio *old)
{
unsigned long refs = READ_ONCE(old->flags.f) & LRU_REFS_MASK;
@@ -330,7 +331,7 @@ static inline bool lru_gen_del_folio(struct lruvec *lruvec, struct folio *folio,
return false;
}
-static inline void folio_migrate_refs(struct folio *new, struct folio *old)
+static inline void folio_migrate_refs(struct folio *new, const struct folio *old)
{
}
@@ -508,7 +509,7 @@ static inline void dec_tlb_flush_pending(struct mm_struct *mm)
atomic_dec(&mm->tlb_flush_pending);
}
-static inline bool mm_tlb_flush_pending(struct mm_struct *mm)
+static inline bool mm_tlb_flush_pending(const struct mm_struct *mm)
{
/*
* Must be called after having acquired the PTL; orders against that
@@ -521,7 +522,7 @@ static inline bool mm_tlb_flush_pending(struct mm_struct *mm)
return atomic_read(&mm->tlb_flush_pending);
}
-static inline bool mm_tlb_flush_nested(struct mm_struct *mm)
+static inline bool mm_tlb_flush_nested(const struct mm_struct *mm)
{
/*
* Similar to mm_tlb_flush_pending(), we must have acquired the PTL
@@ -605,7 +606,7 @@ pte_install_uffd_wp_if_needed(struct vm_area_struct *vma, unsigned long addr,
return false;
}
-static inline bool vma_has_recency(struct vm_area_struct *vma)
+static inline bool vma_has_recency(const struct vm_area_struct *vma)
{
if (vma->vm_flags & (VM_SEQ_READ | VM_RAND_READ))
return false;
--
2.47.2
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