+ mm-collapse-drop-the-collapse_possible-wrapper.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/collapse: drop the collapse_possible() wrapper
has been added to the -mm mm-unstable branch.  Its filename is
     mm-collapse-drop-the-collapse_possible-wrapper.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-collapse-drop-the-collapse_possible-wrapper.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: "Kiryl Shutsemau (Meta)" <kas@kernel.org>
Subject: mm/collapse: drop the collapse_possible() wrapper
Date: Wed, 16 Sep 2026 10:31:33 +0100

collapse_possible() only forwards to collapse_possible_orders() and turns
its mask into a bool.  Its three callers can test the mask themselves.

No functional change.

Assisted-by: LLM
Link: https://lore.kernel.org/20260916093145.4022188-7-kirill@shutemov.name
Signed-off-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jann Horn <jannh@google.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
---

 mm/khugepaged.c |   15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

--- a/mm/khugepaged.c~mm-collapse-drop-the-collapse_possible-wrapper
+++ a/mm/khugepaged.c
@@ -512,17 +512,11 @@ static unsigned long collapse_possible_o
 	return thp_vma_allowable_orders(vma, vm_flags, tva_flags, orders);
 }
 
-static bool collapse_possible(struct vm_area_struct *vma,
-		vm_flags_t vm_flags, enum tva_type tva_flags)
-{
-	return collapse_possible_orders(vma, vm_flags, tva_flags);
-}
-
 void khugepaged_enter_vma(struct vm_area_struct *vma,
 			  vm_flags_t vm_flags)
 {
-	if (!mm_flags_test(MMF_VM_HUGEPAGE, vma->vm_mm) && hugepage_enabled()
-	    && collapse_possible(vma, vm_flags, TVA_KHUGEPAGED))
+	if (!mm_flags_test(MMF_VM_HUGEPAGE, vma->vm_mm) && hugepage_enabled() &&
+	    collapse_possible_orders(vma, vm_flags, TVA_KHUGEPAGED))
 		__khugepaged_enter(vma->vm_mm);
 }
 
@@ -2850,7 +2844,8 @@ static void collapse_scan_mm_slot(unsign
 			cc->progress++;
 			break;
 		}
-		if (!collapse_possible(vma, vma->vm_flags, TVA_KHUGEPAGED)) {
+		if (!collapse_possible_orders(vma, vma->vm_flags,
+					      TVA_KHUGEPAGED)) {
 			cc->progress++;
 			continue;
 		}
@@ -3163,7 +3158,7 @@ int madvise_collapse(struct vm_area_stru
 	BUG_ON(vma->vm_start > start);
 	BUG_ON(vma->vm_end < end);
 
-	if (!collapse_possible(vma, vma->vm_flags, TVA_FORCED_COLLAPSE))
+	if (!collapse_possible_orders(vma, vma->vm_flags, TVA_FORCED_COLLAPSE))
 		return -EINVAL;
 
 	hstart = ALIGN(start, HPAGE_PMD_SIZE);
_

Patches currently in -mm which might be from kas@kernel.org are

mm-huge_memory-do-not-touch-frozen-folios-in-deferred_split_isolate.patch
mm-huge_memory-dequeue-the-deferred-split-after-the-split-freeze.patch
mm-huge_memory-add-folio_reset_partially_mapped.patch
mm-khugepaged-drop-redundant-mm_struct-pin-in-madvise_collapse.patch
mm-khugepaged-count-collapses-where-khugepaged-makes-them.patch
mm-khugepaged-rename-mthp_present_ptes-bitmap-to-eligible_ptes.patch
mm-collapse-add-collapseh-for-the-collapse-interface.patch
mm-collapse-state-what-a-collapse-may-do-in-the-policy.patch
mm-collapse-drop-the-collapse_possible-wrapper.patch
mm-collapse-name-the-per-table-scan-reset-for-what-it-resets.patch
mm-collapse-separate-scanning-a-pte-table-from-collapsing-it.patch
mm-collapse-open-code-collapse_single_pmd-in-its-two-callers.patch
mm-collapse-work-out-the-orders-a-vma-allows-once-per-vma.patch
mm-collapse-declare-the-collapse-interface-in-collapseh.patch
mm-collapse-implement-madv_collapse-in-madvisec.patch