* [PATCH 1/6] mm: add softleaf_to_pmd() and convert existing callers
2026-06-30 16:34 [PATCH 0/6] mm: preparatory patches for PMD level swap entries Usama Arif
@ 2026-06-30 16:34 ` Usama Arif
2026-06-30 16:34 ` [PATCH 2/6] mm: extract mm_prepare_for_swap_entries() helper Usama Arif
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Usama Arif @ 2026-06-30 16:34 UTC (permalink / raw)
To: Andrew Morton, david, chrisl, kasong, ljs, ziy, linux-mm
Cc: ying.huang, Baoquan He, willy, youngjun.park, hannes, riel,
shakeel.butt, alex, kas, baohua, dev.jain, baolin.wang, npache,
Liam R. Howlett, ryan.roberts, Vlastimil Babka, lance.yang,
linux-kernel, nphamcs, shikemeng, kernel-team, Usama Arif
Add softleaf_to_pmd() as the PMD counterpart to softleaf_to_pte(),
completing the symmetry of the softleaf abstraction for page table
leaf entries.
The upcoming PMD swap entry support needs to construct PMD entries
from swap entries. Converting existing swp_entry_to_pmd() callers
to softleaf_to_pmd() in a prep patch keeps the feature patches
focused on new functionality rather than mixing refactoring with
new code.
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Usama Arif <usama.arif@linux.dev>
---
include/linux/leafops.h | 20 ++++++++++++++++++++
mm/debug_vm_pgtable.c | 4 ++--
mm/huge_memory.c | 12 ++++++------
mm/migrate_device.c | 2 +-
4 files changed, 29 insertions(+), 9 deletions(-)
diff --git a/include/linux/leafops.h b/include/linux/leafops.h
index 992cd8bd8ed0..803d312437df 100644
--- a/include/linux/leafops.h
+++ b/include/linux/leafops.h
@@ -108,6 +108,21 @@ static inline softleaf_t softleaf_from_pmd(pmd_t pmd)
return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
}
+/**
+ * softleaf_to_pmd() - Obtain a PMD entry from a leaf entry.
+ * @entry: Leaf entry.
+ *
+ * This generates an architecture-specific PMD entry that can be utilised to
+ * encode the metadata the leaf entry encodes.
+ *
+ * Returns: Architecture-specific PMD entry encoding leaf entry.
+ */
+static inline pmd_t softleaf_to_pmd(softleaf_t entry)
+{
+ /* Temporary until swp_entry_t eliminated. */
+ return swp_entry_to_pmd(entry);
+}
+
#else
static inline softleaf_t softleaf_from_pmd(pmd_t pmd)
@@ -115,6 +130,11 @@ static inline softleaf_t softleaf_from_pmd(pmd_t pmd)
return softleaf_mk_none();
}
+static inline pmd_t softleaf_to_pmd(softleaf_t entry)
+{
+ return __pmd(0);
+}
+
#endif
/**
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 23dc3ee09561..18411fb09aab 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -758,7 +758,7 @@ static void __init pmd_leaf_soft_dirty_tests(struct pgtable_debug_args *args)
return;
pr_debug("Validating PMD swap soft dirty\n");
- pmd = swp_entry_to_pmd(args->leaf_entry);
+ pmd = softleaf_to_pmd(args->leaf_entry);
WARN_ON(!pmd_is_huge(pmd));
WARN_ON(!pmd_is_valid_softleaf(pmd));
@@ -829,7 +829,7 @@ static void __init pmd_softleaf_tests(struct pgtable_debug_args *args)
return;
pr_debug("Validating PMD swap\n");
- pmd1 = swp_entry_to_pmd(args->leaf_entry);
+ pmd1 = softleaf_to_pmd(args->leaf_entry);
WARN_ON(!pmd_is_huge(pmd1));
WARN_ON(!pmd_is_valid_softleaf(pmd1));
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2bccb0a53a0a..d51f53cfbe4f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1819,7 +1819,7 @@ static void copy_huge_non_present_pmd(
if (softleaf_is_migration_write(entry) ||
softleaf_is_migration_read_exclusive(entry)) {
entry = make_readable_migration_entry(swp_offset(entry));
- pmd = swp_entry_to_pmd(entry);
+ pmd = softleaf_to_pmd(entry);
if (pmd_swp_soft_dirty(*src_pmd))
pmd = pmd_swp_mksoft_dirty(pmd);
if (pmd_swp_uffd_wp(*src_pmd))
@@ -1832,7 +1832,7 @@ static void copy_huge_non_present_pmd(
*/
if (softleaf_is_device_private_write(entry)) {
entry = make_readable_device_private_entry(swp_offset(entry));
- pmd = swp_entry_to_pmd(entry);
+ pmd = softleaf_to_pmd(entry);
if (pmd_swp_soft_dirty(*src_pmd))
pmd = pmd_swp_mksoft_dirty(pmd);
@@ -2570,12 +2570,12 @@ static void change_non_present_huge_pmd(struct mm_struct *mm,
entry = make_readable_exclusive_migration_entry(swp_offset(entry));
else
entry = make_readable_migration_entry(swp_offset(entry));
- newpmd = swp_entry_to_pmd(entry);
+ newpmd = softleaf_to_pmd(entry);
if (pmd_swp_soft_dirty(*pmd))
newpmd = pmd_swp_mksoft_dirty(newpmd);
} else if (softleaf_is_device_private_write(entry)) {
entry = make_readable_device_private_entry(swp_offset(entry));
- newpmd = swp_entry_to_pmd(entry);
+ newpmd = softleaf_to_pmd(entry);
if (pmd_swp_uffd_wp(*pmd))
newpmd = pmd_swp_mkuffd_wp(newpmd);
} else {
@@ -4923,7 +4923,7 @@ int set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
}
/* Set PMD. */
- pmdswp = swp_entry_to_pmd(entry);
+ pmdswp = softleaf_to_pmd(entry);
if (softdirty)
pmdswp = pmd_swp_mksoft_dirty(pmdswp);
if (uffd_wp)
@@ -4976,7 +4976,7 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
else
entry = make_readable_device_private_entry(
page_to_pfn(new));
- pmde = swp_entry_to_pmd(entry);
+ pmde = softleaf_to_pmd(entry);
if (pmd_swp_soft_dirty(*pvmw->pmd))
pmde = pmd_swp_mksoft_dirty(pmde);
diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index ae39173d6a0e..aa948db49501 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -835,7 +835,7 @@ static int migrate_vma_insert_huge_pmd_page(struct migrate_vma *migrate,
else
swp_entry = make_readable_device_private_entry(
page_to_pfn(page));
- entry = swp_entry_to_pmd(swp_entry);
+ entry = softleaf_to_pmd(swp_entry);
} else {
if (folio_is_zone_device(folio) &&
!folio_is_device_coherent(folio)) {
--
2.53.0-Meta
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH 2/6] mm: extract mm_prepare_for_swap_entries() helper
2026-06-30 16:34 [PATCH 0/6] mm: preparatory patches for PMD level swap entries Usama Arif
2026-06-30 16:34 ` [PATCH 1/6] mm: add softleaf_to_pmd() and convert existing callers Usama Arif
@ 2026-06-30 16:34 ` Usama Arif
2026-06-30 16:34 ` [PATCH 3/6] fs/proc: use softleaf_has_pfn() in pagemap PMD walker Usama Arif
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Usama Arif @ 2026-06-30 16:34 UTC (permalink / raw)
To: Andrew Morton, david, chrisl, kasong, ljs, ziy, linux-mm
Cc: ying.huang, Baoquan He, willy, youngjun.park, hannes, riel,
shakeel.butt, alex, kas, baohua, dev.jain, baolin.wang, npache,
Liam R. Howlett, ryan.roberts, Vlastimil Babka, lance.yang,
linux-kernel, nphamcs, shikemeng, kernel-team, Usama Arif
When a swap entry is installed in a page table, the mm must be added
to init_mm.mmlist so that swapoff can find and unuse its swap entries.
This double-checked locking pattern is currently open-coded in
try_to_unmap_one() and copy_nonpresent_pte().
Move it into mm_prepare_for_swap_entries() in mm/internal.h and convert
both callers so it can be reused by upcoming PMD-level swap entry code
paths that also need to register the mm with swapoff.
copy_nonpresent_pte() previously inserted into &src_mm->mmlist rather
than &init_mm.mmlist, but the insertion point is irrelevant, mmlist
is a circular list and swapoff walks it entirely from init_mm.mmlist,
so only membership matters, not position.
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Usama Arif <usama.arif@linux.dev>
---
mm/internal.h | 13 +++++++++++++
mm/memory.c | 9 +--------
mm/rmap.c | 7 +------
3 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/mm/internal.h b/mm/internal.h
index 8e0df3d1c6f9..0e3db9451e5c 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1956,4 +1956,17 @@ static inline int get_sysctl_max_map_count(void)
bool may_expand_vm(struct mm_struct *mm, const vma_flags_t *vma_flags,
unsigned long npages);
+/*
+ * Ensure @mm is on the init_mm.mmlist so swapoff can find it.
+ */
+static inline void mm_prepare_for_swap_entries(struct mm_struct *mm)
+{
+ if (list_empty(&mm->mmlist)) {
+ spin_lock(&mmlist_lock);
+ if (list_empty(&mm->mmlist))
+ list_add(&mm->mmlist, &init_mm.mmlist);
+ spin_unlock(&mmlist_lock);
+ }
+}
+
#endif /* __MM_INTERNAL_H */
diff --git a/mm/memory.c b/mm/memory.c
index a3fcaf8cfe8f..6637c5b13c9b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -953,14 +953,7 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
if (swap_dup_entry_direct(entry) < 0)
return -EIO;
- /* make sure dst_mm is on swapoff's mmlist. */
- if (unlikely(list_empty(&dst_mm->mmlist))) {
- spin_lock(&mmlist_lock);
- if (list_empty(&dst_mm->mmlist))
- list_add(&dst_mm->mmlist,
- &src_mm->mmlist);
- spin_unlock(&mmlist_lock);
- }
+ mm_prepare_for_swap_entries(dst_mm);
/* Mark the swap entry as shared. */
if (pte_swp_exclusive(orig_pte)) {
pte = pte_swp_clear_exclusive(orig_pte);
diff --git a/mm/rmap.c b/mm/rmap.c
index 1c77d5dc06e9..b93caabd186f 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -2304,12 +2304,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
set_pte_at(mm, address, pvmw.pte, pteval);
goto walk_abort;
}
- if (list_empty(&mm->mmlist)) {
- spin_lock(&mmlist_lock);
- if (list_empty(&mm->mmlist))
- list_add(&mm->mmlist, &init_mm.mmlist);
- spin_unlock(&mmlist_lock);
- }
+ mm_prepare_for_swap_entries(mm);
dec_mm_counter(mm, MM_ANONPAGES);
inc_mm_counter(mm, MM_SWAPENTS);
swp_pte = swp_entry_to_pte(entry);
--
2.53.0-Meta
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH 3/6] fs/proc: use softleaf_has_pfn() in pagemap PMD walker
2026-06-30 16:34 [PATCH 0/6] mm: preparatory patches for PMD level swap entries Usama Arif
2026-06-30 16:34 ` [PATCH 1/6] mm: add softleaf_to_pmd() and convert existing callers Usama Arif
2026-06-30 16:34 ` [PATCH 2/6] mm: extract mm_prepare_for_swap_entries() helper Usama Arif
@ 2026-06-30 16:34 ` Usama Arif
2026-06-30 16:34 ` [PATCH 4/6] mm/huge_memory: move softleaf_to_folio() inside migration branch Usama Arif
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Usama Arif @ 2026-06-30 16:34 UTC (permalink / raw)
To: Andrew Morton, david, chrisl, kasong, ljs, ziy, linux-mm
Cc: ying.huang, Baoquan He, willy, youngjun.park, hannes, riel,
shakeel.butt, alex, kas, baohua, dev.jain, baolin.wang, npache,
Liam R. Howlett, ryan.roberts, Vlastimil Babka, lance.yang,
linux-kernel, nphamcs, shikemeng, kernel-team, Usama Arif
pagemap_pmd_range_thp() assumes that every non-present PMD is a
migration entry and unconditionally calls softleaf_to_page(). This
will crash on any non-present PMD type that does not encode a PFN,
such as the upcoming PMD-level swap entries.
Guard the page lookup with softleaf_has_pfn(), matching how
pte_to_pagemap_entry() already handles non-present PTEs.
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Usama Arif <usama.arif@linux.dev>
---
fs/proc/task_mmu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index d32408f7cd5e..1fb5acd88ad0 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -2129,7 +2129,8 @@ static int pagemap_pmd_range_thp(pmd_t *pmdp, unsigned long addr,
flags |= PM_SOFT_DIRTY;
if (pmd_swp_uffd_wp(pmd))
flags |= PM_UFFD_WP;
- page = softleaf_to_page(entry);
+ if (softleaf_has_pfn(entry))
+ page = softleaf_to_page(entry);
}
if (page) {
--
2.53.0-Meta
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH 4/6] mm/huge_memory: move softleaf_to_folio() inside migration branch
2026-06-30 16:34 [PATCH 0/6] mm: preparatory patches for PMD level swap entries Usama Arif
` (2 preceding siblings ...)
2026-06-30 16:34 ` [PATCH 3/6] fs/proc: use softleaf_has_pfn() in pagemap PMD walker Usama Arif
@ 2026-06-30 16:34 ` Usama Arif
2026-06-30 16:34 ` [PATCH 5/6] mm/migrate_device: move softleaf_to_folio() inside device-private branch Usama Arif
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Usama Arif @ 2026-06-30 16:34 UTC (permalink / raw)
To: Andrew Morton, david, chrisl, kasong, ljs, ziy, linux-mm
Cc: ying.huang, Baoquan He, willy, youngjun.park, hannes, riel,
shakeel.butt, alex, kas, baohua, dev.jain, baolin.wang, npache,
Liam R. Howlett, ryan.roberts, Vlastimil Babka, lance.yang,
linux-kernel, nphamcs, shikemeng, kernel-team, Usama Arif
change_non_present_huge_pmd() calls softleaf_to_folio() unconditionally
at the top of the function. softleaf_to_folio() extracts a PFN from
the entry and converts it to a folio pointer, which is only meaningful
for migration and device_private entries that encode a real PFN.
A swap entry encodes a swap offset instead, so softleaf_to_folio()
would produce a bogus pointer and crash on mprotect() when a PMD swap
entry is present.
Move the call into the migration_write branch where the folio is
actually used, so the function is safe for any non-present PMD type.
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Usama Arif <usama.arif@linux.dev>
---
mm/huge_memory.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index d51f53cfbe4f..4aca9cdff73f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2557,11 +2557,12 @@ static void change_non_present_huge_pmd(struct mm_struct *mm,
bool uffd_wp_resolve)
{
softleaf_t entry = softleaf_from_pmd(*pmd);
- const struct folio *folio = softleaf_to_folio(entry);
pmd_t newpmd;
VM_WARN_ON(!pmd_is_valid_softleaf(*pmd));
if (softleaf_is_migration_write(entry)) {
+ const struct folio *folio = softleaf_to_folio(entry);
+
/*
* A protection check is difficult so
* just be safe and disable write
--
2.53.0-Meta
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH 5/6] mm/migrate_device: move softleaf_to_folio() inside device-private branch
2026-06-30 16:34 [PATCH 0/6] mm: preparatory patches for PMD level swap entries Usama Arif
` (3 preceding siblings ...)
2026-06-30 16:34 ` [PATCH 4/6] mm/huge_memory: move softleaf_to_folio() inside migration branch Usama Arif
@ 2026-06-30 16:34 ` Usama Arif
2026-06-30 16:34 ` [PATCH 6/6] mm: rename ARCH_ENABLE_THP_MIGRATION to ARCH_SUPPORTS_PMD_SOFTLEAF Usama Arif
2026-06-30 19:50 ` [PATCH 0/6] mm: preparatory patches for PMD level swap entries Andrew Morton
6 siblings, 0 replies; 8+ messages in thread
From: Usama Arif @ 2026-06-30 16:34 UTC (permalink / raw)
To: Andrew Morton, david, chrisl, kasong, ljs, ziy, linux-mm
Cc: ying.huang, Baoquan He, willy, youngjun.park, hannes, riel,
shakeel.butt, alex, kas, baohua, dev.jain, baolin.wang, npache,
Liam R. Howlett, ryan.roberts, Vlastimil Babka, lance.yang,
linux-kernel, nphamcs, shikemeng, kernel-team, Usama Arif
migrate_vma_collect_pmd() calls softleaf_to_folio() on a non-present
PMD before checking the entry's type. softleaf_to_folio() converts
the entry's offset to a PFN, which is only meaningful for migration
or device-private entries.
A PMD swap entry's offset is a swap offset, not a PFN, so the
lookup would either return a bogus folio pointer or trip pfn_to_page
validation on a debug kernel. In the non-device-private path the
returned folio is then unused (the OR short-circuits to
migrate_vma_collect_skip()), but the lookup itself is already
unsafe.
Move the softleaf_to_folio() call inside the device-private branch
where the folio is actually needed, mirroring the equivalent
change_non_present_huge_pmd() fix.
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Usama Arif <usama.arif@linux.dev>
---
mm/migrate_device.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index aa948db49501..36287e958b2a 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -166,11 +166,14 @@ static int migrate_vma_collect_huge_pmd(pmd_t *pmdp, unsigned long start,
} else if (!pmd_present(*pmdp)) {
const softleaf_t entry = softleaf_from_pmd(*pmdp);
- folio = softleaf_to_folio(entry);
-
if (!softleaf_is_device_private(entry) ||
- !(migrate->flags & MIGRATE_VMA_SELECT_DEVICE_PRIVATE) ||
- (folio->pgmap->owner != migrate->pgmap_owner)) {
+ !(migrate->flags & MIGRATE_VMA_SELECT_DEVICE_PRIVATE)) {
+ spin_unlock(ptl);
+ return migrate_vma_collect_skip(start, end, walk);
+ }
+
+ folio = softleaf_to_folio(entry);
+ if (folio->pgmap->owner != migrate->pgmap_owner) {
spin_unlock(ptl);
return migrate_vma_collect_skip(start, end, walk);
}
--
2.53.0-Meta
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH 6/6] mm: rename ARCH_ENABLE_THP_MIGRATION to ARCH_SUPPORTS_PMD_SOFTLEAF
2026-06-30 16:34 [PATCH 0/6] mm: preparatory patches for PMD level swap entries Usama Arif
` (4 preceding siblings ...)
2026-06-30 16:34 ` [PATCH 5/6] mm/migrate_device: move softleaf_to_folio() inside device-private branch Usama Arif
@ 2026-06-30 16:34 ` Usama Arif
2026-06-30 19:50 ` [PATCH 0/6] mm: preparatory patches for PMD level swap entries Andrew Morton
6 siblings, 0 replies; 8+ messages in thread
From: Usama Arif @ 2026-06-30 16:34 UTC (permalink / raw)
To: Andrew Morton, david, chrisl, kasong, ljs, ziy, linux-mm
Cc: ying.huang, Baoquan He, willy, youngjun.park, hannes, riel,
shakeel.butt, alex, kas, baohua, dev.jain, baolin.wang, npache,
Liam R. Howlett, ryan.roberts, Vlastimil Babka, lance.yang,
linux-kernel, nphamcs, shikemeng, kernel-team, Usama Arif
CONFIG_ARCH_ENABLE_THP_MIGRATION started life gating just PMD-level
migration entries, but has grown to gate the entire PMD-level softleaf
machinery: migration entries, device-private entries, and soon swap
entries.
Rename CONFIG_ARCH_ENABLE_THP_MIGRATION to CONFIG_ARCH_SUPPORTS_PMD
_SOFTLEAF to make this clear. This is a pure rename: the set of
selecting architectures (x86, arm64, s390, riscv, loongarch, and
powerpc on PPC_BOOK3S_64) and the gating semantics are unchanged.
No functional change intended.
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Usama Arif <usama.arif@linux.dev>
---
arch/arm64/Kconfig | 2 +-
arch/arm64/include/asm/pgtable.h | 4 ++--
arch/loongarch/Kconfig | 2 +-
arch/powerpc/include/asm/book3s/64/pgtable.h | 2 +-
arch/powerpc/platforms/Kconfig.cputype | 2 +-
arch/riscv/Kconfig | 2 +-
arch/riscv/include/asm/pgtable.h | 8 ++++----
arch/s390/Kconfig | 2 +-
arch/s390/include/asm/pgtable.h | 2 +-
arch/x86/Kconfig | 2 +-
arch/x86/include/asm/pgtable.h | 2 +-
include/linux/huge_mm.h | 2 +-
include/linux/leafops.h | 8 ++++----
include/linux/pgtable.h | 2 +-
include/linux/swapops.h | 6 +++---
mm/Kconfig | 2 +-
mm/debug_vm_pgtable.c | 8 ++++----
mm/hmm.c | 4 ++--
mm/huge_memory.c | 2 +-
mm/migrate.c | 4 ++--
mm/migrate_device.c | 6 +++---
mm/rmap.c | 2 +-
22 files changed, 38 insertions(+), 38 deletions(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b3afe0688919..3eb94f36c77e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -17,7 +17,7 @@ config ARM64
select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
select ARCH_ENABLE_MEMORY_HOTPLUG
select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
- select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
+ select ARCH_SUPPORTS_PMD_SOFTLEAF if TRANSPARENT_HUGEPAGE
select ARCH_HAS_CACHE_LINE_SIZE
select ARCH_HAS_CC_PLATFORM
select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 27689c62bd25..984badfa9a74 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1534,10 +1534,10 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
#define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
#define __swp_entry_to_pmd(swp) __pmd((swp).val)
-#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#endif /* CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
/*
* Ensure that there are not more swap files than can be encoded in the kernel
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index d8d252325017..550142b7ee10 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -12,7 +12,7 @@ config LOONGARCH
select ARCH_NEEDS_DEFER_KASAN
select ARCH_DISABLE_KASAN_INLINE
select ARCH_ENABLE_MEMORY_HOTPLUG
- select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
+ select ARCH_SUPPORTS_PMD_SOFTLEAF if TRANSPARENT_HUGEPAGE
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_CPU_FINALIZE_INIT
select ARCH_HAS_CURRENT_STACK_POINTER
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index e67e64ac6e8c..6f30aa8a6490 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -1060,7 +1060,7 @@ static inline pte_t *pmdp_ptep(pmd_t *pmd)
#define pmd_mksoft_dirty(pmd) pte_pmd(pte_mksoft_dirty(pmd_pte(pmd)))
#define pmd_clear_soft_dirty(pmd) pte_pmd(pte_clear_soft_dirty(pmd_pte(pmd)))
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
#define pmd_swp_mksoft_dirty(pmd) pte_pmd(pte_swp_mksoft_dirty(pmd_pte(pmd)))
#define pmd_swp_soft_dirty(pmd) pte_swp_soft_dirty(pmd_pte(pmd))
#define pmd_swp_clear_soft_dirty(pmd) pte_pmd(pte_swp_clear_soft_dirty(pmd_pte(pmd)))
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index bac02c83bb3e..4a0fa681bf98 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -112,7 +112,7 @@ config PPC_THP
depends on PPC_RADIX_MMU || (PPC_64S_HASH_MMU && PAGE_SIZE_64KB)
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
- select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
+ select ARCH_SUPPORTS_PMD_SOFTLEAF if TRANSPARENT_HUGEPAGE
choice
prompt "CPU selection"
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 3f0a647218e4..bf7b271cccd8 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -22,7 +22,7 @@ config RISCV
select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM_VMEMMAP
select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
- select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
+ select ARCH_SUPPORTS_PMD_SOFTLEAF if TRANSPARENT_HUGEPAGE
select ARCH_HAS_BINFMT_FLAT
select ARCH_HAS_CC_CAN_LINK
select ARCH_HAS_CURRENT_STACK_POINTER
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 5d5756bda82e..2aa529e882d3 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -946,7 +946,7 @@ static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
return pte_pmd(pte_clear_soft_dirty(pmd_pte(pmd)));
}
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
static inline bool pmd_swp_soft_dirty(pmd_t pmd)
{
return pte_swp_soft_dirty(pmd_pte(pmd));
@@ -961,7 +961,7 @@ static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
{
return pte_pmd(pte_swp_clear_soft_dirty(pmd_pte(pmd)));
}
-#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#endif /* CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
@@ -1208,10 +1208,10 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
return __pte(pte_val(pte) & ~_PAGE_SWP_EXCLUSIVE);
}
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
#define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
#define __swp_entry_to_pmd(swp) __pmd((swp).val)
-#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#endif /* CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
/*
* In the RV64 Linux scheme, we give the user half of the virtual-address space
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 84404e6778d5..0719f68de0f3 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -82,7 +82,7 @@ config S390
select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
- select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
+ select ARCH_SUPPORTS_PMD_SOFTLEAF if TRANSPARENT_HUGEPAGE
select ARCH_HAS_CC_CAN_LINK
select ARCH_HAS_CPU_FINALIZE_INIT
select ARCH_HAS_CURRENT_STACK_POINTER
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 859ce7c7d454..6faccfa63b09 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -903,7 +903,7 @@ static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
return clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_SOFT_DIRTY));
}
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
#define pmd_swp_soft_dirty(pmd) pmd_soft_dirty(pmd)
#define pmd_swp_mksoft_dirty(pmd) pmd_mksoft_dirty(pmd)
#define pmd_swp_clear_soft_dirty(pmd) pmd_clear_soft_dirty(pmd)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bdad90f210e4..50e00d8417aa 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -70,7 +70,7 @@ config X86
select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRATION
select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64
select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 || X86_PAE)
- select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE
+ select ARCH_SUPPORTS_PMD_SOFTLEAF if X86_64 && TRANSPARENT_HUGEPAGE
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_CPU_ATTACK_VECTORS if CPU_MITIGATIONS
select ARCH_HAS_CACHE_LINE_SIZE
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index ac295ca6c92f..e0fd318d4004 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1545,7 +1545,7 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
}
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
{
return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index ad20f7f8c179..1487bf4af1a7 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -567,7 +567,7 @@ static inline struct folio *get_persistent_huge_zero_folio(void)
static inline bool thp_migration_supported(void)
{
- return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
+ return IS_ENABLED(CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF);
}
void split_huge_pmd_locked(struct vm_area_struct *vma, unsigned long address,
diff --git a/include/linux/leafops.h b/include/linux/leafops.h
index 803d312437df..88888daeb018 100644
--- a/include/linux/leafops.h
+++ b/include/linux/leafops.h
@@ -81,7 +81,7 @@ static inline pte_t softleaf_to_pte(softleaf_t entry)
return swp_entry_to_pte(entry);
}
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
/**
* softleaf_from_pmd() - Obtain a leaf entry from a PMD entry.
* @pmd: PMD entry.
@@ -587,7 +587,7 @@ static inline bool pte_is_uffd_marker(pte_t pte)
return false;
}
-#if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_ARCH_ENABLE_THP_MIGRATION)
+#if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF)
/**
* pmd_is_device_private_entry() - Check if PMD contains a device private swap
@@ -606,14 +606,14 @@ static inline bool pmd_is_device_private_entry(pmd_t pmd)
return softleaf_is_device_private(softleaf_from_pmd(pmd));
}
-#else /* CONFIG_ZONE_DEVICE && CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#else /* CONFIG_ZONE_DEVICE && CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
static inline bool pmd_is_device_private_entry(pmd_t pmd)
{
return false;
}
-#endif /* CONFIG_ZONE_DEVICE && CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#endif /* CONFIG_ZONE_DEVICE && CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
/**
* pmd_is_migration_entry() - Does this PMD entry encode a migration entry?
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index d52d2a976e5a..e38f069c1c91 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1839,7 +1839,7 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
#endif
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
-#ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifndef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
{
return pmd;
diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index 8cfc966eae48..705a84154d28 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -321,7 +321,7 @@ static inline swp_entry_t make_guard_swp_entry(void)
struct page_vma_mapped_walk;
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
extern int set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
struct page *page);
@@ -338,7 +338,7 @@ static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
return __swp_entry_to_pmd(arch_entry);
}
-#else /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#else /* CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
static inline int set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
struct page *page)
{
@@ -358,7 +358,7 @@ static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
return __pmd(0);
}
-#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#endif /* CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
#endif /* CONFIG_MMU */
#endif /* _LINUX_SWAPOPS_H */
diff --git a/mm/Kconfig b/mm/Kconfig
index 9e0ca4824905..04fe5171bb8c 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -703,7 +703,7 @@ config DEVICE_MIGRATION
config ARCH_ENABLE_HUGEPAGE_MIGRATION
bool
-config ARCH_ENABLE_THP_MIGRATION
+config ARCH_SUPPORTS_PMD_SOFTLEAF
bool
config HUGETLB_PAGE_SIZE_VARIABLE
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 18411fb09aab..507fbd1ae7e5 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -751,7 +751,7 @@ static void __init pmd_leaf_soft_dirty_tests(struct pgtable_debug_args *args)
pmd_t pmd;
if (!pgtable_supports_soft_dirty() ||
- !IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION))
+ !IS_ENABLED(CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF))
return;
if (!has_transparent_hugepage())
@@ -819,7 +819,7 @@ static void __init pte_swap_tests(struct pgtable_debug_args *args)
WARN_ON(memcmp(&pte1, &pte2, sizeof(pte1)));
}
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
static void __init pmd_softleaf_tests(struct pgtable_debug_args *args)
{
swp_entry_t arch_entry;
@@ -837,9 +837,9 @@ static void __init pmd_softleaf_tests(struct pgtable_debug_args *args)
pmd2 = __swp_entry_to_pmd(arch_entry);
WARN_ON(memcmp(&pmd1, &pmd2, sizeof(pmd1)));
}
-#else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#else /* !CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
static void __init pmd_softleaf_tests(struct pgtable_debug_args *args) { }
-#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#endif /* CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
static void __init swap_migration_tests(struct pgtable_debug_args *args)
{
diff --git a/mm/hmm.c b/mm/hmm.c
index c72c9ddfdb2f..4f3f627d2b47 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -331,7 +331,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
return hmm_vma_fault(addr, end, required_fault, walk);
}
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
static int hmm_vma_handle_absent_pmd(struct mm_walk *walk, unsigned long start,
unsigned long end, unsigned long *hmm_pfns,
pmd_t pmd)
@@ -391,7 +391,7 @@ static int hmm_vma_handle_absent_pmd(struct mm_walk *walk, unsigned long start,
return -EFAULT;
return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
}
-#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#endif /* CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
static int hmm_vma_walk_pmd(pmd_t *pmdp,
unsigned long start,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 4aca9cdff73f..4b6e441ae931 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -4864,7 +4864,7 @@ static int __init split_huge_pages_debugfs(void)
late_initcall(split_huge_pages_debugfs);
#endif
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
int set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
struct page *page)
{
diff --git a/mm/migrate.c b/mm/migrate.c
index 49e10feeb094..c48dc5127e6a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -362,7 +362,7 @@ static bool remove_migration_pte(struct folio *folio,
idx = linear_page_index(vma, pvmw.address) - pvmw.pgoff;
new = folio_page(folio, idx);
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
/* PMD-mapped THP migration entry */
if (!pvmw.pte) {
VM_BUG_ON_FOLIO(folio_test_hugetlb(folio) ||
@@ -545,7 +545,7 @@ void migration_entry_wait_huge(struct vm_area_struct *vma, unsigned long addr, p
}
#endif
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd)
{
spinlock_t *ptl;
diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index 36287e958b2a..2f8b646302c2 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -771,7 +771,7 @@ int migrate_vma_setup(struct migrate_vma *args)
}
EXPORT_SYMBOL(migrate_vma_setup);
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
/**
* migrate_vma_insert_huge_pmd_page: Insert a huge folio into @migrate->vma->vm_mm
* at @addr. folio is already allocated as a part of the migration process with
@@ -926,7 +926,7 @@ static int migrate_vma_split_unmapped_folio(struct migrate_vma *migrate,
migrate->src[i+idx] = migrate_pfn(pfn + i) | flags;
return ret;
}
-#else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */
+#else /* !CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF */
static int migrate_vma_insert_huge_pmd_page(struct migrate_vma *migrate,
unsigned long addr,
struct page *page,
@@ -947,7 +947,7 @@ static int migrate_vma_split_unmapped_folio(struct migrate_vma *migrate,
static unsigned long migrate_vma_nr_pages(unsigned long *src)
{
unsigned long nr = 1;
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
if (*src & MIGRATE_PFN_COMPOUND)
nr = HPAGE_PMD_NR;
#else
diff --git a/mm/rmap.c b/mm/rmap.c
index b93caabd186f..0fb7a1b82cf3 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -2472,7 +2472,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
page_vma_mapped_walk_restart(&pvmw);
continue;
}
-#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+#ifdef CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF
pmdval = pmdp_get(pvmw.pmd);
if (likely(pmd_present(pmdval)))
pfn = pmd_pfn(pmdval);
--
2.53.0-Meta
^ permalink raw reply related [flat|nested] 8+ messages in thread* Re: [PATCH 0/6] mm: preparatory patches for PMD level swap entries
2026-06-30 16:34 [PATCH 0/6] mm: preparatory patches for PMD level swap entries Usama Arif
` (5 preceding siblings ...)
2026-06-30 16:34 ` [PATCH 6/6] mm: rename ARCH_ENABLE_THP_MIGRATION to ARCH_SUPPORTS_PMD_SOFTLEAF Usama Arif
@ 2026-06-30 19:50 ` Andrew Morton
6 siblings, 0 replies; 8+ messages in thread
From: Andrew Morton @ 2026-06-30 19:50 UTC (permalink / raw)
To: Usama Arif
Cc: david, chrisl, kasong, ljs, ziy, linux-mm, ying.huang, Baoquan He,
willy, youngjun.park, hannes, riel, shakeel.butt, alex, kas,
baohua, dev.jain, baolin.wang, npache, Liam R. Howlett,
ryan.roberts, Vlastimil Babka, lance.yang, linux-kernel, nphamcs,
shikemeng, kernel-team
On Tue, 30 Jun 2026 09:34:37 -0700 Usama Arif <usama.arif@linux.dev> wrote:
> This is the preparatory part of the PMD page table swapin work.
Thanks.
This comes reasonably reviewed, so I'll queue it in mm-new.
Why?
- Human review coverage and AI review make me believe this isn't the
final version at all, but I do believe this is something we want in
7.2, and getting it under test early will help to push it along.
- Getting it in there early means that others will base their work on
material which will probably be upstreamed this cycle, so this gives
them a more accurate base against which to work.
Sashiko did find a lot to talk about, some of it pre-existing so can
people who work on this code please take a look at
https://sashiko.dev/#/patchset/20260630164143.1595669-1-usama.arif@linux.dev
^ permalink raw reply [flat|nested] 8+ messages in thread