[PATCH v10 01/13] khugepaged: rename hpage_collapse_* to collapse_*

Nico Pache
2025-08-19T13:43:22Z

The hpage_collapse functions describe functions used by madvise_collapse
and khugepaged. remove the unnecessary hpage prefix to shorten the
function name.

Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Nico Pache <npache@redhat.com>
---
mm/khugepaged.c | 73 ++++++++++++++++++++++++-------------------------
1 file changed, 36 insertions(+), 37 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index d3d4f116e14b..0e7bbadf03ee 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -402,14 +402,14 @@ void __init khugepaged_destroy(void)
kmem_cache_destroy(mm_slot_cache);
}

-static inline int hpage_collapse_test_exit(struct mm_struct *mm)
+static inline int collapse_test_exit(struct mm_struct *mm)
{
return atomic_read(&mm->mm_users) == 0;
}

-static inline int hpage_collapse_test_exit_or_disable(struct mm_struct *mm)
+static inline int collapse_test_exit_or_disable(struct mm_struct *mm)
{
- return hpage_collapse_test_exit(mm) ||
+ return collapse_test_exit(mm) ||
mm_flags_test(MMF_DISABLE_THP_COMPLETELY, mm);
}

@@ -444,7 +444,7 @@ void __khugepaged_enter(struct mm_struct *mm)
int wakeup;

/* __khugepaged_exit() must not run from under us */
- VM_BUG_ON_MM(hpage_collapse_test_exit(mm), mm);
+ VM_BUG_ON_MM(collapse_test_exit(mm), mm);
if (unlikely(mm_flags_test_and_set(MMF_VM_HUGEPAGE, mm)))
return;

@@ -502,7 +502,7 @@ void __khugepaged_exit(struct mm_struct *mm)
} else if (mm_slot) {
/*
* This is required to serialize against
- * hpage_collapse_test_exit() (which is guaranteed to run
+ * collapse_test_exit() (which is guaranteed to run
* under mmap sem read mode). Stop here (after we return all
* pagetables will be destroyed) until khugepaged has finished
* working on the pagetables under the mmap_lock.
@@ -592,7 +592,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
folio = page_folio(page);
VM_BUG_ON_FOLIO(!folio_test_anon(folio), folio);

- /* See hpage_collapse_scan_pmd(). */
+ /* See collapse_scan_pmd(). */
if (folio_maybe_mapped_shared(folio)) {
++shared;
if (cc->is_khugepaged &&
@@ -848,7 +848,7 @@ struct collapse_control khugepaged_collapse_control = {
.is_khugepaged = true,
};

-static bool hpage_collapse_scan_abort(int nid, struct collapse_control *cc)
+static bool collapse_scan_abort(int nid, struct collapse_control *cc)
{
int i;

@@ -883,7 +883,7 @@ static inline gfp_t alloc_hugepage_khugepaged_gfpmask(void)
}

#ifdef CONFIG_NUMA
-static int hpage_collapse_find_target_node(struct collapse_control *cc)
+static int collapse_find_target_node(struct collapse_control *cc)
{
int nid, target_node = 0, max_value = 0;

@@ -902,7 +902,7 @@ static int hpage_collapse_find_target_node(struct collapse_control *cc)
return target_node;
}
#else
-static int hpage_collapse_find_target_node(struct collapse_control *cc)
+static int collapse_find_target_node(struct collapse_control *cc)
{
return 0;
}
@@ -923,7 +923,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
enum tva_type type = cc->is_khugepaged ? TVA_KHUGEPAGED :
TVA_FORCED_COLLAPSE;

- if (unlikely(hpage_collapse_test_exit_or_disable(mm)))
+ if (unlikely(collapse_test_exit_or_disable(mm)))
return SCAN_ANY_PROCESS;

*vmap = vma = find_vma(mm, address);
@@ -996,7 +996,7 @@ static int check_pmd_still_valid(struct mm_struct *mm,

/*
* Bring missing pages in from swap, to complete THP collapse.
- * Only done if hpage_collapse_scan_pmd believes it is worthwhile.
+ * Only done if khugepaged_scan_pmd believes it is worthwhile.
*
* Called and returns without pte mapped or spinlocks held.
* Returns result: if not SCAN_SUCCEED, mmap_lock has been released.
@@ -1082,7 +1082,7 @@ static int alloc_charge_folio(struct folio **foliop, struct mm_struct *mm,
{
gfp_t gfp = (cc->is_khugepaged ? alloc_hugepage_khugepaged_gfpmask() :
GFP_TRANSHUGE);
- int node = hpage_collapse_find_target_node(cc);
+ int node = collapse_find_target_node(cc);
struct folio *folio;

folio = __folio_alloc(gfp, HPAGE_PMD_ORDER, node, &cc->alloc_nmask);
@@ -1268,10 +1268,10 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
return result;
}

-static int hpage_collapse_scan_pmd(struct mm_struct *mm,
- struct vm_area_struct *vma,
- unsigned long address, bool *mmap_locked,
- struct collapse_control *cc)
+static int collapse_scan_pmd(struct mm_struct *mm,
+ struct vm_area_struct *vma,
+ unsigned long address, bool *mmap_locked,
+ struct collapse_control *cc)
{
pmd_t *pmd;
pte_t *pte, *_pte;
@@ -1382,7 +1382,7 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm,
* hit record.
*/
node = folio_nid(folio);
- if (hpage_collapse_scan_abort(node, cc)) {
+ if (collapse_scan_abort(node, cc)) {
result = SCAN_SCAN_ABORT;
goto out_unmap;
}
@@ -1451,7 +1451,7 @@ static void collect_mm_slot(struct khugepaged_mm_slot *mm_slot)

lockdep_assert_held(&khugepaged_mm_lock);

- if (hpage_collapse_test_exit(mm)) {
+ if (collapse_test_exit(mm)) {
/* free mm_slot */
hash_del(&slot->hash);
list_del(&slot->mm_node);
@@ -1753,7 +1753,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
if (find_pmd_or_thp_or_none(mm, addr, &pmd) != SCAN_SUCCEED)
continue;

- if (hpage_collapse_test_exit(mm))
+ if (collapse_test_exit(mm))
continue;
/*
* When a vma is registered with uffd-wp, we cannot recycle
@@ -2275,9 +2275,9 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
return result;
}

-static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr,
- struct file *file, pgoff_t start,
- struct collapse_control *cc)
+static int collapse_scan_file(struct mm_struct *mm, unsigned long addr,
+ struct file *file, pgoff_t start,
+ struct collapse_control *cc)
{
struct folio *folio = NULL;
struct address_space *mapping = file->f_mapping;
@@ -2332,7 +2332,7 @@ static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr,
}

node = folio_nid(folio);
- if (hpage_collapse_scan_abort(node, cc)) {
+ if (collapse_scan_abort(node, cc)) {
result = SCAN_SCAN_ABORT;
folio_put(folio);
break;
@@ -2382,7 +2382,7 @@ static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr,
return result;
}

-static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
+static unsigned int collapse_scan_mm_slot(unsigned int pages, int *result,
struct collapse_control *cc)
__releases(&khugepaged_mm_lock)
__acquires(&khugepaged_mm_lock)
@@ -2420,7 +2420,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
goto breakouterloop_mmap_lock;

progress++;
- if (unlikely(hpage_collapse_test_exit_or_disable(mm)))
+ if (unlikely(collapse_test_exit_or_disable(mm)))
goto breakouterloop;

vma_iter_init(&vmi, mm, khugepaged_scan.address);
@@ -2428,7 +2428,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
unsigned long hstart, hend;

cond_resched();
- if (unlikely(hpage_collapse_test_exit_or_disable(mm))) {
+ if (unlikely(collapse_test_exit_or_disable(mm))) {
progress++;
break;
}
@@ -2449,7 +2449,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
bool mmap_locked = true;

cond_resched();
- if (unlikely(hpage_collapse_test_exit_or_disable(mm)))
+ if (unlikely(collapse_test_exit_or_disable(mm)))
goto breakouterloop;

VM_BUG_ON(khugepaged_scan.address < hstart ||
@@ -2462,12 +2462,12 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,

mmap_read_unlock(mm);
mmap_locked = false;
- *result = hpage_collapse_scan_file(mm,
+ *result = collapse_scan_file(mm,
khugepaged_scan.address, file, pgoff, cc);
fput(file);
if (*result == SCAN_PTE_MAPPED_HUGEPAGE) {
mmap_read_lock(mm);
- if (hpage_collapse_test_exit_or_disable(mm))
+ if (collapse_test_exit_or_disable(mm))
goto breakouterloop;
*result = collapse_pte_mapped_thp(mm,
khugepaged_scan.address, false);
@@ -2476,7 +2476,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
mmap_read_unlock(mm);
}
} else {
- *result = hpage_collapse_scan_pmd(mm, vma,
+ *result = collapse_scan_pmd(mm, vma,
khugepaged_scan.address, &mmap_locked, cc);
}

@@ -2509,7 +2509,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
* Release the current mm_slot if this mm is about to die, or
* if we scanned all vmas of this mm.
*/
- if (hpage_collapse_test_exit(mm) || !vma) {
+ if (collapse_test_exit(mm) || !vma) {
/*
* Make sure that if mm_users is reaching zero while
* khugepaged runs here, khugepaged_exit will find
@@ -2563,8 +2563,8 @@ static void khugepaged_do_scan(struct collapse_control *cc)
pass_through_head++;
if (khugepaged_has_work() &&
pass_through_head < 2)
- progress += khugepaged_scan_mm_slot(pages - progress,
- &result, cc);
+ progress += collapse_scan_mm_slot(pages - progress,
+ &result, cc);
else
progress = pages;
spin_unlock(&khugepaged_mm_lock);
@@ -2805,12 +2805,11 @@ int madvise_collapse(struct vm_area_struct *vma, unsigned long start,

mmap_read_unlock(mm);
mmap_locked = false;
- result = hpage_collapse_scan_file(mm, addr, file, pgoff,
- cc);
+ result = collapse_scan_file(mm, addr, file, pgoff, cc);
fput(file);
} else {
- result = hpage_collapse_scan_pmd(mm, vma, addr,
- &mmap_locked, cc);
+ result = collapse_scan_pmd(mm, vma, addr,
+ &mmap_locked, cc);
}
if (!mmap_locked)
*lock_dropped = true;
--
2.50.1