* + mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch added to mm-unstable branch
@ 2026-09-17 1:36 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2026-09-17 1:36 UTC (permalink / raw)
To: mm-commits, songmuchun, akpm
The patch titled
Subject: mm/sparse-vmemmap: prepare DAX vmemmap population for compound page orders
has been added to the -mm mm-unstable branch. Its filename is
mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Muchun Song <songmuchun@bytedance.com>
Subject: mm/sparse-vmemmap: prepare DAX vmemmap population for compound page orders
Date: Wed, 16 Sep 2026 14:43:34 +0800
Device DAX still uses vmemmap_populate_compound_pages() to populate its
compound-page vmemmap mappings. That helper allocates the head and first
tail vmemmap pages explicitly, then reuses the first tail page for the
remaining tail page mappings.
Device DAX is being moved to the section-based vmemmap optimization
infrastructure, but it cannot switch to the generic section-based
population path yet. Once a later patch records the DAX compound page
order in section metadata, DAX head and first-tail PFNs can look
optimizable to the generic helpers as well.
Add a DAX-specific population flag for this transition. It keeps DAX
head/first-tail allocations on the normal vmemmap allocation path, while
preserving the existing page reference for reused DAX tail mappings.
Link: https://lore.kernel.org/20260916064341.1825793-5-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Qi Zheng <qi.zheng@linux.dev>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Randy Dunlap <rdunlap@infradead.org>
---
mm/sparse-vmemmap.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
--- a/mm/sparse-vmemmap.c~mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders
+++ a/mm/sparse-vmemmap.c
@@ -35,8 +35,8 @@
/*
* Flags for vmemmap_populate_range and friends.
*/
-/* Get a ref on the head page struct page, for ZONE_DEVICE compound pages */
-#define VMEMMAP_POPULATE_PAGEREF 0x0001
+/* Vmemmap population for ZONE_DEVICE compound pages */
+#define VMEMMAP_POPULATE_DAX 0x0001
#include "internal.h"
#include "mm_init.h"
@@ -208,13 +208,17 @@ struct page __ref *vmemmap_shared_tail_p
}
static __meminit void *vmemmap_alloc_pte(unsigned long pfn, int node,
- struct vmem_altmap *altmap)
+ struct vmem_altmap *altmap, unsigned long flags)
{
struct zone *zone;
struct page *page;
const unsigned int order = pfn_to_section_compound_order(pfn);
- if (!vmemmap_optimizable_pfn(pfn))
+ /*
+ * Device DAX still relies on vmemmap_populate_compound_pages() for
+ * head/first-tail allocation and tail-page reuse.
+ */
+ if (!vmemmap_optimizable_pfn(pfn) || flags & VMEMMAP_POPULATE_DAX)
return vmemmap_alloc_block_buf(PAGE_SIZE, node, altmap);
zone = pfn_to_zone(pfn, node);
@@ -236,7 +240,7 @@ static pte_t * __meminit vmemmap_pte_pop
pte_t entry;
if (ptpfn == (unsigned long)-1) {
- void *p = vmemmap_alloc_pte(pfn, node, altmap);
+ void *p = vmemmap_alloc_pte(pfn, node, altmap, flags);
if (!p)
return NULL;
@@ -251,7 +255,7 @@ static pte_t * __meminit vmemmap_pte_pop
* and through vmemmap_populate_compound_pages() when
* slab is available.
*/
- if (flags & VMEMMAP_POPULATE_PAGEREF)
+ if (flags & VMEMMAP_POPULATE_DAX)
get_page(pfn_to_page(ptpfn));
}
entry = pfn_pte(ptpfn, PAGE_KERNEL);
@@ -511,6 +515,7 @@ static int __meminit vmemmap_populate_co
unsigned long size, addr;
pte_t *pte;
int rc;
+ unsigned long flags = VMEMMAP_POPULATE_DAX;
if (reuse_compound_section(start_pfn, pgmap)) {
pte = compound_section_tail_page(start);
@@ -522,8 +527,7 @@ static int __meminit vmemmap_populate_co
* with just tail struct pages.
*/
return vmemmap_populate_range(start, end, node, NULL,
- pte_pfn(ptep_get(pte)),
- VMEMMAP_POPULATE_PAGEREF);
+ pte_pfn(ptep_get(pte)), flags);
}
size = min(end - start, pgmap_vmemmap_nr(pgmap) * sizeof(struct page));
@@ -531,13 +535,13 @@ static int __meminit vmemmap_populate_co
unsigned long next, last = addr + size;
/* Populate the head page vmemmap page */
- pte = vmemmap_populate_address(addr, node, NULL, -1, 0);
+ pte = vmemmap_populate_address(addr, node, NULL, -1, flags);
if (!pte)
return -ENOMEM;
/* Populate the tail pages vmemmap page */
next = addr + PAGE_SIZE;
- pte = vmemmap_populate_address(next, node, NULL, -1, 0);
+ pte = vmemmap_populate_address(next, node, NULL, -1, flags);
if (!pte)
return -ENOMEM;
@@ -547,8 +551,7 @@ static int __meminit vmemmap_populate_co
*/
next += PAGE_SIZE;
rc = vmemmap_populate_range(next, last, node, NULL,
- pte_pfn(ptep_get(pte)),
- VMEMMAP_POPULATE_PAGEREF);
+ pte_pfn(ptep_get(pte)), flags);
if (rc)
return -ENOMEM;
}
_
Patches currently in -mm which might be from songmuchun@bytedance.com are
mm-sparse-relax-struct-mem_section-size-constraints.patch
mm-sparse-vmemmap-rename-hvo-order-macros.patch
mm-mm_init-skip-initializing-shared-vmemmap-tail-pages.patch
mm-sparse-vmemmap-initialize-shared-tail-vmemmap-pages-on-allocation.patch
mm-sparse-vmemmap-support-section-based-vmemmap-accounting.patch
mm-mm_init-factor-out-pfn_to_zone.patch
mm-sparse-vmemmap-move-helpers-ahead-of-future-callers.patch
mm-sparse-vmemmap-support-section-based-vmemmap-optimization.patch
mm-sparse-initialize-memory-sections-earlier.patch
mm-hugetlb-switch-hugetlb-to-section-based-vmemmap-optimization.patch
mm-sparse-vmemmap-remove-sparsemem_vmemmap_preinit-support.patch
mm-sparse-inline-usemap-allocation-into-sparse_init_nid.patch
mm-sparse-remove-section_map_size.patch
mm-hugetlb-remove-huge_bootmem_hvo.patch
mm-hugetlb-remove-huge_bootmem_cma.patch
mm-hugetlb-localize-struct-huge_bootmem_page.patch
mm-hugetlb-localize-huge_bootmem_zones_valid.patch
mm-sparse-vmemmap-introduce-config_vmemmap_optimization.patch
mm-sparse-vmemmap-introduce-config_vmemmap_optimization-fix.patch
mm-sparse-vmemmap-factor-out-shared-vmemmap-tail-page-allocation.patch
mm-sparse-vmemmap-open-code-init_compound_tail.patch
mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
mm-sparse-vmemmap-set-compound-page-order-for-device-dax.patch
mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages.patch
mm-sparse-vmemmap-move-vmemmap-optimization-helpers-to-a-public-header.patch
powerpc-mm-switch-device-dax-to-shared-tail-vmemmap-pages.patch
mm-sparse-vmemmap-drop-the-extra-tail-page-from-device-dax-reservation.patch
mm-sparse-vmemmap-drop-unused-section_nr_vmemmap_pages-arguments.patch
documentation-mm-update-dax-vmemmap-deduplication-docs.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
* + mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch added to mm-unstable branch
@ 2026-09-27 5:51 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2026-09-27 5:51 UTC (permalink / raw)
To: mm-commits, muchun.song, akpm
The patch titled
Subject: mm/sparse-vmemmap: prepare DAX vmemmap population for compound page orders
has been added to the -mm mm-unstable branch. Its filename is
mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Muchun Song <muchun.song@linux.dev>
Subject: mm/sparse-vmemmap: prepare DAX vmemmap population for compound page orders
Date: Sun, 27 Sep 2026 10:54:34 +0800
Device DAX still uses vmemmap_populate_compound_pages() to populate its
compound-page vmemmap mappings. That helper allocates the head and first
tail vmemmap pages explicitly, then reuses the first tail page for the
remaining tail page mappings.
Device DAX is being moved to the section-based vmemmap optimization
infrastructure, but it cannot switch to the generic section-based
population path yet. Once a later patch records the DAX compound page
order in section metadata, DAX head and first-tail PFNs can look
optimizable to the generic helpers as well.
Add a DAX-specific population flag for this transition. It keeps DAX
head/first-tail allocations on the normal vmemmap allocation path, while
preserving the existing page reference for reused DAX tail mappings.
Link: https://lore.kernel.org/20260927025441.741633-6-songmuchun@bytedance.com
Signed-off-by: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Qi Zheng <qi.zheng@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Christophe Leroy <chleroy@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Lance Yang <lance.yang@linux.dev>
---
mm/sparse-vmemmap.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
--- a/mm/sparse-vmemmap.c~mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders
+++ a/mm/sparse-vmemmap.c
@@ -35,8 +35,8 @@
/*
* Flags for vmemmap_populate_range and friends.
*/
-/* Get a ref on the head page struct page, for ZONE_DEVICE compound pages */
-#define VMEMMAP_POPULATE_PAGEREF 0x0001
+/* Vmemmap population for ZONE_DEVICE compound pages */
+#define VMEMMAP_POPULATE_DAX 0x0001
#include "internal.h"
#include "mm_init.h"
@@ -243,13 +243,17 @@ static inline struct page *vmemmap_share
#endif
static __meminit void *vmemmap_alloc_pte(unsigned long pfn, int node,
- struct vmem_altmap *altmap)
+ struct vmem_altmap *altmap, unsigned long flags)
{
struct zone *zone;
struct page *page;
const unsigned int order = pfn_to_section_compound_order(pfn);
- if (!vmemmap_optimizable_pfn(pfn))
+ /*
+ * Device DAX still relies on vmemmap_populate_compound_pages() for
+ * head/first-tail allocation and tail-page reuse.
+ */
+ if (!vmemmap_optimizable_pfn(pfn) || flags & VMEMMAP_POPULATE_DAX)
return vmemmap_alloc_block_buf(PAGE_SIZE, node, altmap);
zone = pfn_to_zone(pfn, node);
@@ -271,7 +275,7 @@ static pte_t * __meminit vmemmap_pte_pop
pte_t entry;
if (ptpfn == (unsigned long)-1) {
- void *p = vmemmap_alloc_pte(pfn, node, altmap);
+ void *p = vmemmap_alloc_pte(pfn, node, altmap, flags);
if (!p)
return NULL;
@@ -286,7 +290,7 @@ static pte_t * __meminit vmemmap_pte_pop
* and through vmemmap_populate_compound_pages() when
* slab is available.
*/
- if (flags & VMEMMAP_POPULATE_PAGEREF)
+ if (flags & VMEMMAP_POPULATE_DAX)
get_page(pfn_to_page(ptpfn));
}
entry = pfn_pte(ptpfn, PAGE_KERNEL);
@@ -546,6 +550,7 @@ static int __meminit vmemmap_populate_co
unsigned long size, addr;
pte_t *pte;
int rc;
+ unsigned long flags = VMEMMAP_POPULATE_DAX;
if (reuse_compound_section(start_pfn, pgmap)) {
pte = compound_section_tail_page(start);
@@ -557,8 +562,7 @@ static int __meminit vmemmap_populate_co
* with just tail struct pages.
*/
return vmemmap_populate_range(start, end, node, NULL,
- pte_pfn(ptep_get(pte)),
- VMEMMAP_POPULATE_PAGEREF);
+ pte_pfn(ptep_get(pte)), flags);
}
size = min(end - start, pgmap_vmemmap_nr(pgmap) * sizeof(struct page));
@@ -566,13 +570,13 @@ static int __meminit vmemmap_populate_co
unsigned long next, last = addr + size;
/* Populate the head page vmemmap page */
- pte = vmemmap_populate_address(addr, node, NULL, -1, 0);
+ pte = vmemmap_populate_address(addr, node, NULL, -1, flags);
if (!pte)
return -ENOMEM;
/* Populate the tail pages vmemmap page */
next = addr + PAGE_SIZE;
- pte = vmemmap_populate_address(next, node, NULL, -1, 0);
+ pte = vmemmap_populate_address(next, node, NULL, -1, flags);
if (!pte)
return -ENOMEM;
@@ -582,8 +586,7 @@ static int __meminit vmemmap_populate_co
*/
next += PAGE_SIZE;
rc = vmemmap_populate_range(next, last, node, NULL,
- pte_pfn(ptep_get(pte)),
- VMEMMAP_POPULATE_PAGEREF);
+ pte_pfn(ptep_get(pte)), flags);
if (rc)
return -ENOMEM;
}
_
Patches currently in -mm which might be from muchun.song@linux.dev are
mm-sparse-vmemmap-factor-out-shared-vmemmap-tail-page-allocation.patch
mm-sparse-vmemmap-allocate-shared-tail-page-array-dynamically.patch
mm-sparse-vmemmap-introduce-config_vmemmap_optimization.patch
mm-sparse-vmemmap-open-code-init_compound_tail.patch
mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
mm-sparse-vmemmap-set-compound-page-order-for-device-dax.patch
mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages.patch
mm-sparse-vmemmap-move-vmemmap-optimization-helpers-to-a-public-header.patch
powerpc-mm-switch-device-dax-to-shared-tail-vmemmap-pages.patch
mm-sparse-vmemmap-drop-the-extra-tail-page-from-device-dax-reservation.patch
mm-sparse-vmemmap-drop-unused-section_nr_vmemmap_pages-arguments.patch
documentation-mm-update-dax-vmemmap-deduplication-docs.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
* + mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch added to mm-unstable branch
@ 2026-09-30 19:01 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2026-09-30 19:01 UTC (permalink / raw)
To: mm-commits, muchun.song, akpm
The patch titled
Subject: mm/sparse-vmemmap: prepare DAX vmemmap population for compound page orders
has been added to the -mm mm-unstable branch. Its filename is
mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Muchun Song <muchun.song@linux.dev>
Subject: mm/sparse-vmemmap: prepare DAX vmemmap population for compound page orders
Date: Wed, 30 Sep 2026 22:06:20 +0800
Device DAX still uses vmemmap_populate_compound_pages() to populate its
compound-page vmemmap mappings. That helper allocates the head and first
tail vmemmap pages explicitly, then reuses the first tail page for the
remaining tail page mappings.
Device DAX is being moved to the section-based vmemmap optimization
infrastructure, but it cannot switch to the generic section-based
population path yet. Once a later patch records the DAX compound page
order in section metadata, DAX head and first-tail PFNs can look
optimizable to the generic helpers as well.
Rename the existing VMEMMAP_POPULATE_PAGEREF flag to VMEMMAP_POPULATE_DAX
and pass it through all paths in vmemmap_populate_compound_pages() during
this transition. This keeps DAX head/first-tail allocations on the normal
vmemmap allocation path, while preserving the existing page reference for
reused DAX tail mappings.
Link: https://lore.kernel.org/20260930140627.57431-6-songmuchun@bytedance.com
Signed-off-by: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Qi Zheng <qi.zheng@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Christophe Leroy <chleroy@kernel.org>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Lance Yang <lance.yang@linux.dev>
---
mm/sparse-vmemmap.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
--- a/mm/sparse-vmemmap.c~mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders
+++ a/mm/sparse-vmemmap.c
@@ -35,8 +35,8 @@
/*
* Flags for vmemmap_populate_range and friends.
*/
-/* Get a ref on the head page struct page, for ZONE_DEVICE compound pages */
-#define VMEMMAP_POPULATE_PAGEREF 0x0001
+/* Vmemmap population for ZONE_DEVICE compound pages */
+#define VMEMMAP_POPULATE_DAX 0x0001
#include "internal.h"
#include "mm_init.h"
@@ -247,13 +247,17 @@ static inline struct page *vmemmap_share
#endif
static __meminit void *vmemmap_alloc_pte(unsigned long pfn, int node,
- struct vmem_altmap *altmap)
+ struct vmem_altmap *altmap, unsigned long flags)
{
struct zone *zone;
struct page *page;
const unsigned int order = pfn_to_section_compound_order(pfn);
- if (!vmemmap_optimizable_pfn(pfn))
+ /*
+ * Device DAX still relies on vmemmap_populate_compound_pages() for
+ * head/first-tail allocation and tail-page reuse.
+ */
+ if (!vmemmap_optimizable_pfn(pfn) || flags & VMEMMAP_POPULATE_DAX)
return vmemmap_alloc_block_buf(PAGE_SIZE, node, altmap);
zone = pfn_to_zone(pfn, node);
@@ -275,7 +279,7 @@ static pte_t * __meminit vmemmap_pte_pop
pte_t entry;
if (ptpfn == (unsigned long)-1) {
- void *p = vmemmap_alloc_pte(pfn, node, altmap);
+ void *p = vmemmap_alloc_pte(pfn, node, altmap, flags);
if (!p)
return NULL;
@@ -290,7 +294,7 @@ static pte_t * __meminit vmemmap_pte_pop
* and through vmemmap_populate_compound_pages() when
* slab is available.
*/
- if (flags & VMEMMAP_POPULATE_PAGEREF)
+ if (flags & VMEMMAP_POPULATE_DAX)
get_page(pfn_to_page(ptpfn));
}
entry = pfn_pte(ptpfn, PAGE_KERNEL);
@@ -547,6 +551,7 @@ static int __meminit vmemmap_populate_co
unsigned long end, int node,
struct dev_pagemap *pgmap)
{
+ const unsigned long flags = VMEMMAP_POPULATE_DAX;
unsigned long size, addr;
pte_t *pte;
int rc;
@@ -561,8 +566,7 @@ static int __meminit vmemmap_populate_co
* with just tail struct pages.
*/
return vmemmap_populate_range(start, end, node, NULL,
- pte_pfn(ptep_get(pte)),
- VMEMMAP_POPULATE_PAGEREF);
+ pte_pfn(ptep_get(pte)), flags);
}
size = min(end - start, pgmap_vmemmap_nr(pgmap) * sizeof(struct page));
@@ -570,13 +574,13 @@ static int __meminit vmemmap_populate_co
unsigned long next, last = addr + size;
/* Populate the head page vmemmap page */
- pte = vmemmap_populate_address(addr, node, NULL, -1, 0);
+ pte = vmemmap_populate_address(addr, node, NULL, -1, flags);
if (!pte)
return -ENOMEM;
/* Populate the tail pages vmemmap page */
next = addr + PAGE_SIZE;
- pte = vmemmap_populate_address(next, node, NULL, -1, 0);
+ pte = vmemmap_populate_address(next, node, NULL, -1, flags);
if (!pte)
return -ENOMEM;
@@ -586,8 +590,7 @@ static int __meminit vmemmap_populate_co
*/
next += PAGE_SIZE;
rc = vmemmap_populate_range(next, last, node, NULL,
- pte_pfn(ptep_get(pte)),
- VMEMMAP_POPULATE_PAGEREF);
+ pte_pfn(ptep_get(pte)), flags);
if (rc)
return -ENOMEM;
}
_
Patches currently in -mm which might be from muchun.song@linux.dev are
mm-sparse-vmemmap-factor-out-shared-vmemmap-tail-page-allocation.patch
mm-sparse-vmemmap-allocate-shared-tail-page-array-dynamically.patch
mm-sparse-vmemmap-introduce-config_vmemmap_optimization.patch
mm-sparse-vmemmap-open-code-init_compound_tail.patch
mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch
mm-sparse-vmemmap-set-compound-page-order-for-device-dax.patch
mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages.patch
mm-sparse-vmemmap-switch-device-dax-to-shared-tail-vmemmap-pages-fix.patch
mm-sparse-vmemmap-move-vmemmap-optimization-helpers-to-a-public-header.patch
powerpc-mm-switch-device-dax-to-shared-tail-vmemmap-pages.patch
powerpc-mm-switch-device-dax-to-shared-tail-vmemmap-pages-fix.patch
mm-sparse-vmemmap-drop-the-extra-tail-page-from-device-dax-reservation.patch
mm-sparse-vmemmap-drop-unused-section_nr_vmemmap_pages-arguments.patch
documentation-mm-update-dax-vmemmap-deduplication-docs.patch
mm-sparse-vmemmap-drop-vmemmap_populate_dax.patch
mm-sparse-vmemmap-support-device-dax-in-common-vmemmap-path.patch
mm-sparse-vmemmap-drop-device-dax-specific-population-path.patch
mm-sparse-vmemmap-remove-the-unused-ptpfn-argument.patch
mm-sparse-vmemmap-open-code-vmemmap_populate_address.patch
mm-mm_init-add-zone-mismatch-warning-during-page-init.patch
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2026-09-27 5:51 + mm-sparse-vmemmap-prepare-dax-vmemmap-population-for-compound-page-orders.patch added to mm-unstable branch Andrew Morton
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2026-09-30 19:01 Andrew Morton
2026-09-17 1:36 Andrew Morton
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