linux-next: manual merge of the tip tree with the mm-unstable tree

linux-next: manual merge of the tip tree with the mm-unstable tree

[Mark Brown]

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Hi all,

Today's linux-next merge of the tip tree got a conflict in:

  init/main.c

between commit:

  e91e16820a507 ("lib: introduce hierarchical per-cpu counters")

from the mm-unstable tree and commit:

  05988dba11791 ("vdso/datastore: Allocate data pages dynamically")

from the tip tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

diff --cc init/main.c
index 13aeb7834111a,de867b2693d21..0000000000000
--- a/init/main.c
+++ b/init/main.c
@@@ -105,7 -105,7 +105,8 @@@
  #include <linux/ptdump.h>
  #include <linux/time_namespace.h>
  #include <linux/unaligned.h>
 +#include <linux/percpu_counter_tree.h>
+ #include <linux/vdso_datastore.h>
  #include <net/net_namespace.h>
  
  #include <asm/io.h>

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linux-next: manual merge of the tip tree with the mm-unstable tree

[Mark Brown]

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Hi all,

Today's linux-next merge of the tip tree got a conflict in:

  lib/vdso/datastore.c

between commit:

  5f5ffe21e7530e ("mm: rename zap_vma_pages() to zap_vma()")

from the mm-unstable tree and commit:

  5dc9cf835aba73 ("vdso/timens: Move functions to new file")

from the tip tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

diff --cc lib/vdso/datastore.c
index 222c143aebf764,cf5d784a4a5a14..00000000000000
--- a/lib/vdso/datastore.c
+++ b/lib/vdso/datastore.c
diff --git a/kernel/time/namespace_vdso.c b/kernel/time/namespace_vdso.c
index 88c075cd16a361..0d74d160eec98b 100644
--- a/kernel/time/namespace_vdso.c
+++ b/kernel/time/namespace_vdso.c
@@ -134,7 +134,7 @@ static int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
 	guard(mmap_read_lock)(mm);
 	for_each_vma(vmi, vma) {
 		if (vma_is_special_mapping(vma, &vdso_vvar_mapping))
-			zap_vma_pages(vma);
+			zap_vma(vma);
 	}
 	return 0;
 }

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linux-next: manual merge of the tip tree with the mm-unstable tree

[Stephen Rothwell]

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Hi all,

Today's linux-next merge of the tip tree got a conflict in:

  mm/vmstat.c

between commit:

  954386324a11 ("mm/vmstat: utilize designated initializers for the vmstat_text array")

from the mm-unstable tree and commit:

  8662a3e5e9c4 ("Revert "sched/numa: add statistics of numa balance task"")

from the tip tree.

I fixed it up (see below - search for NUMA_BALANCING) and can carry the
fix as necessary. This is now fixed as far as linux-next is concerned,
but any non trivial conflicts should be mentioned to your upstream
maintainer when your tree is submitted for merging.  You may also want
to consider cooperating with the maintainer of the conflicting tree to
minimise any particularly complex conflicts.

I assume that this will go away when the Revert above goes into Linus'
tree (or returns to the mm-hotfixes tre).
-- 
Cheers,
Stephen Rothwell

diff --cc mm/vmstat.c
index e0fcd9057f34,a78d70ddeacd..000000000000
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@@ -1196,195 -1192,178 +1196,193 @@@ int fragmentation_index(struct zone *zo
  
  const char * const vmstat_text[] = {
  	/* enum zone_stat_item counters */
 -	"nr_free_pages",
 -	"nr_free_pages_blocks",
 -	"nr_zone_inactive_anon",
 -	"nr_zone_active_anon",
 -	"nr_zone_inactive_file",
 -	"nr_zone_active_file",
 -	"nr_zone_unevictable",
 -	"nr_zone_write_pending",
 -	"nr_mlock",
 +#define I(x) (x)
 +	[I(NR_FREE_PAGES)]			= "nr_free_pages",
 +	[I(NR_FREE_PAGES_BLOCKS)]		= "nr_free_pages_blocks",
 +	[I(NR_ZONE_INACTIVE_ANON)]		= "nr_zone_inactive_anon",
 +	[I(NR_ZONE_ACTIVE_ANON)]		= "nr_zone_active_anon",
 +	[I(NR_ZONE_INACTIVE_FILE)]		= "nr_zone_inactive_file",
 +	[I(NR_ZONE_ACTIVE_FILE)]		= "nr_zone_active_file",
 +	[I(NR_ZONE_UNEVICTABLE)]		= "nr_zone_unevictable",
 +	[I(NR_ZONE_WRITE_PENDING)]		= "nr_zone_write_pending",
 +	[I(NR_MLOCK)]				= "nr_mlock",
  #if IS_ENABLED(CONFIG_ZSMALLOC)
 -	"nr_zspages",
 +	[I(NR_ZSPAGES)]				= "nr_zspages",
  #endif
 -	"nr_free_cma",
 +	[I(NR_FREE_CMA_PAGES)]			= "nr_free_cma",
  #ifdef CONFIG_UNACCEPTED_MEMORY
 -	"nr_unaccepted",
 +	[I(NR_UNACCEPTED)]			= "nr_unaccepted",
  #endif
 +#undef I
  
  	/* enum numa_stat_item counters */
 +#define I(x) (NR_VM_ZONE_STAT_ITEMS + x)
  #ifdef CONFIG_NUMA
 -	"numa_hit",
 -	"numa_miss",
 -	"numa_foreign",
 -	"numa_interleave",
 -	"numa_local",
 -	"numa_other",
 +	[I(NUMA_HIT)]				= "numa_hit",
 +	[I(NUMA_MISS)]				= "numa_miss",
 +	[I(NUMA_FOREIGN)]			= "numa_foreign",
 +	[I(NUMA_INTERLEAVE_HIT)]		= "numa_interleave",
 +	[I(NUMA_LOCAL)]				= "numa_local",
 +	[I(NUMA_OTHER)]				= "numa_other",
  #endif
 +#undef I
  
  	/* enum node_stat_item counters */
 -	"nr_inactive_anon",
 -	"nr_active_anon",
 -	"nr_inactive_file",
 -	"nr_active_file",
 -	"nr_unevictable",
 -	"nr_slab_reclaimable",
 -	"nr_slab_unreclaimable",
 -	"nr_isolated_anon",
 -	"nr_isolated_file",
 -	"workingset_nodes",
 -	"workingset_refault_anon",
 -	"workingset_refault_file",
 -	"workingset_activate_anon",
 -	"workingset_activate_file",
 -	"workingset_restore_anon",
 -	"workingset_restore_file",
 -	"workingset_nodereclaim",
 -	"nr_anon_pages",
 -	"nr_mapped",
 -	"nr_file_pages",
 -	"nr_dirty",
 -	"nr_writeback",
 -	"nr_writeback_temp",
 -	"nr_shmem",
 -	"nr_shmem_hugepages",
 -	"nr_shmem_pmdmapped",
 -	"nr_file_hugepages",
 -	"nr_file_pmdmapped",
 -	"nr_anon_transparent_hugepages",
 -	"nr_vmscan_write",
 -	"nr_vmscan_immediate_reclaim",
 -	"nr_dirtied",
 -	"nr_written",
 -	"nr_throttled_written",
 -	"nr_kernel_misc_reclaimable",
 -	"nr_foll_pin_acquired",
 -	"nr_foll_pin_released",
 -	"nr_kernel_stack",
 +#define I(x) (NR_VM_ZONE_STAT_ITEMS + NR_VM_NUMA_EVENT_ITEMS + x)
 +	[I(NR_INACTIVE_ANON)]			= "nr_inactive_anon",
 +	[I(NR_ACTIVE_ANON)]			= "nr_active_anon",
 +	[I(NR_INACTIVE_FILE)]			= "nr_inactive_file",
 +	[I(NR_ACTIVE_FILE)]			= "nr_active_file",
 +	[I(NR_UNEVICTABLE)]			= "nr_unevictable",
 +	[I(NR_SLAB_RECLAIMABLE_B)]		= "nr_slab_reclaimable",
 +	[I(NR_SLAB_UNRECLAIMABLE_B)]		= "nr_slab_unreclaimable",
 +	[I(NR_ISOLATED_ANON)]			= "nr_isolated_anon",
 +	[I(NR_ISOLATED_FILE)]			= "nr_isolated_file",
 +	[I(WORKINGSET_NODES)]			= "workingset_nodes",
 +	[I(WORKINGSET_REFAULT_ANON)]		= "workingset_refault_anon",
 +	[I(WORKINGSET_REFAULT_FILE)]		= "workingset_refault_file",
 +	[I(WORKINGSET_ACTIVATE_ANON)]		= "workingset_activate_anon",
 +	[I(WORKINGSET_ACTIVATE_FILE)]		= "workingset_activate_file",
 +	[I(WORKINGSET_RESTORE_ANON)]		= "workingset_restore_anon",
 +	[I(WORKINGSET_RESTORE_FILE)]		= "workingset_restore_file",
 +	[I(WORKINGSET_NODERECLAIM)]		= "workingset_nodereclaim",
 +	[I(NR_ANON_MAPPED)]			= "nr_anon_pages",
 +	[I(NR_FILE_MAPPED)]			= "nr_mapped",
 +	[I(NR_FILE_PAGES)]			= "nr_file_pages",
 +	[I(NR_FILE_DIRTY)]			= "nr_dirty",
 +	[I(NR_WRITEBACK)]			= "nr_writeback",
 +	[I(NR_SHMEM)]				= "nr_shmem",
 +	[I(NR_SHMEM_THPS)]			= "nr_shmem_hugepages",
 +	[I(NR_SHMEM_PMDMAPPED)]			= "nr_shmem_pmdmapped",
 +	[I(NR_FILE_THPS)]			= "nr_file_hugepages",
 +	[I(NR_FILE_PMDMAPPED)]			= "nr_file_pmdmapped",
 +	[I(NR_ANON_THPS)]			= "nr_anon_transparent_hugepages",
 +	[I(NR_VMSCAN_WRITE)]			= "nr_vmscan_write",
 +	[I(NR_VMSCAN_IMMEDIATE)]		= "nr_vmscan_immediate_reclaim",
 +	[I(NR_DIRTIED)]				= "nr_dirtied",
 +	[I(NR_WRITTEN)]				= "nr_written",
 +	[I(NR_THROTTLED_WRITTEN)]		= "nr_throttled_written",
 +	[I(NR_KERNEL_MISC_RECLAIMABLE)]		= "nr_kernel_misc_reclaimable",
 +	[I(NR_FOLL_PIN_ACQUIRED)]		= "nr_foll_pin_acquired",
 +	[I(NR_FOLL_PIN_RELEASED)]		= "nr_foll_pin_released",
 +	[I(NR_KERNEL_STACK_KB)]			= "nr_kernel_stack",
  #if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
 -	"nr_shadow_call_stack",
 +	[I(NR_KERNEL_SCS_KB)]			= "nr_shadow_call_stack",
  #endif
 -	"nr_page_table_pages",
 -	"nr_sec_page_table_pages",
 +	[I(NR_PAGETABLE)]			= "nr_page_table_pages",
 +	[I(NR_SECONDARY_PAGETABLE)]		= "nr_sec_page_table_pages",
  #ifdef CONFIG_IOMMU_SUPPORT
 -	"nr_iommu_pages",
 +	[I(NR_IOMMU_PAGES)]			= "nr_iommu_pages",
  #endif
  #ifdef CONFIG_SWAP
 -	"nr_swapcached",
 +	[I(NR_SWAPCACHE)]			= "nr_swapcached",
  #endif
  #ifdef CONFIG_NUMA_BALANCING
 -	"pgpromote_success",
 -	"pgpromote_candidate",
 +	[I(PGPROMOTE_SUCCESS)]			= "pgpromote_success",
 +	[I(PGPROMOTE_CANDIDATE)]		= "pgpromote_candidate",
  #endif
 -	"pgdemote_kswapd",
 -	"pgdemote_direct",
 -	"pgdemote_khugepaged",
 -	"pgdemote_proactive",
 +	[I(PGDEMOTE_KSWAPD)]			= "pgdemote_kswapd",
 +	[I(PGDEMOTE_DIRECT)]			= "pgdemote_direct",
 +	[I(PGDEMOTE_KHUGEPAGED)]		= "pgdemote_khugepaged",
 +	[I(PGDEMOTE_PROACTIVE)]			= "pgdemote_proactive",
  #ifdef CONFIG_HUGETLB_PAGE
 -	"nr_hugetlb",
 +	[I(NR_HUGETLB)]				= "nr_hugetlb",
  #endif
 -	"nr_balloon_pages",
 +	[I(NR_BALLOON_PAGES)]			= "nr_balloon_pages",
 +#undef I
 +
  	/* system-wide enum vm_stat_item counters */
 -	"nr_dirty_threshold",
 -	"nr_dirty_background_threshold",
 -	"nr_memmap_pages",
 -	"nr_memmap_boot_pages",
 +#define I(x) (NR_VM_ZONE_STAT_ITEMS + NR_VM_NUMA_EVENT_ITEMS + \
 +	     NR_VM_NODE_STAT_ITEMS + x)
 +	[I(NR_DIRTY_THRESHOLD)]			= "nr_dirty_threshold",
 +	[I(NR_DIRTY_BG_THRESHOLD)]		= "nr_dirty_background_threshold",
 +	[I(NR_MEMMAP_PAGES)]			= "nr_memmap_pages",
 +	[I(NR_MEMMAP_BOOT_PAGES)]		= "nr_memmap_boot_pages",
 +#undef I
  
 -#if defined(CONFIG_VM_EVENT_COUNTERS) || defined(CONFIG_MEMCG)
 +#if defined(CONFIG_VM_EVENT_COUNTERS)
  	/* enum vm_event_item counters */
 -	"pgpgin",
 -	"pgpgout",
 -	"pswpin",
 -	"pswpout",
 +#define I(x) (NR_VM_ZONE_STAT_ITEMS + NR_VM_NUMA_EVENT_ITEMS + \
 +	     NR_VM_NODE_STAT_ITEMS + NR_VM_STAT_ITEMS + x)
  
 -	TEXTS_FOR_ZONES("pgalloc")
 -	TEXTS_FOR_ZONES("allocstall")
 -	TEXTS_FOR_ZONES("pgskip")
 +	[I(PGPGIN)]				= "pgpgin",
 +	[I(PGPGOUT)]				= "pgpgout",
 +	[I(PSWPIN)]				= "pswpin",
 +	[I(PSWPOUT)]				= "pswpout",
  
 -	"pgfree",
 -	"pgactivate",
 -	"pgdeactivate",
 -	"pglazyfree",
 +#define OFF (NR_VM_ZONE_STAT_ITEMS + NR_VM_NUMA_EVENT_ITEMS + \
 +	     NR_VM_NODE_STAT_ITEMS + NR_VM_STAT_ITEMS)
 +	TEXTS_FOR_ZONES(OFF+PGALLOC, "pgalloc")
 +	TEXTS_FOR_ZONES(OFF+ALLOCSTALL, "allocstall")
 +	TEXTS_FOR_ZONES(OFF+PGSCAN_SKIP, "pgskip")
 +#undef OFF
  
 -	"pgfault",
 -	"pgmajfault",
 -	"pglazyfreed",
 +	[I(PGFREE)]				= "pgfree",
 +	[I(PGACTIVATE)]				= "pgactivate",
 +	[I(PGDEACTIVATE)]			= "pgdeactivate",
 +	[I(PGLAZYFREE)]				= "pglazyfree",
  
 -	"pgrefill",
 -	"pgreuse",
 -	"pgsteal_kswapd",
 -	"pgsteal_direct",
 -	"pgsteal_khugepaged",
 -	"pgsteal_proactive",
 -	"pgscan_kswapd",
 -	"pgscan_direct",
 -	"pgscan_khugepaged",
 -	"pgscan_proactive",
 -	"pgscan_direct_throttle",
 -	"pgscan_anon",
 -	"pgscan_file",
 -	"pgsteal_anon",
 -	"pgsteal_file",
 +	[I(PGFAULT)]				= "pgfault",
 +	[I(PGMAJFAULT)]				= "pgmajfault",
 +	[I(PGLAZYFREED)]			= "pglazyfreed",
 +
 +	[I(PGREFILL)]				= "pgrefill",
 +	[I(PGREUSE)]				= "pgreuse",
 +	[I(PGSTEAL_KSWAPD)]			= "pgsteal_kswapd",
 +	[I(PGSTEAL_DIRECT)]			= "pgsteal_direct",
 +	[I(PGSTEAL_KHUGEPAGED)]			= "pgsteal_khugepaged",
 +	[I(PGSTEAL_PROACTIVE)]			= "pgsteal_proactive",
 +	[I(PGSCAN_KSWAPD)]			= "pgscan_kswapd",
 +	[I(PGSCAN_DIRECT)]			= "pgscan_direct",
 +	[I(PGSCAN_KHUGEPAGED)]			= "pgscan_khugepaged",
 +	[I(PGSCAN_PROACTIVE)]			= "pgscan_proactive",
 +	[I(PGSCAN_DIRECT_THROTTLE)]		= "pgscan_direct_throttle",
 +	[I(PGSCAN_ANON)]			= "pgscan_anon",
 +	[I(PGSCAN_FILE)]			= "pgscan_file",
 +	[I(PGSTEAL_ANON)]			= "pgsteal_anon",
 +	[I(PGSTEAL_FILE)]			= "pgsteal_file",
  
  #ifdef CONFIG_NUMA
 -	"zone_reclaim_success",
 -	"zone_reclaim_failed",
 +	[I(PGSCAN_ZONE_RECLAIM_SUCCESS)]	= "zone_reclaim_success",
 +	[I(PGSCAN_ZONE_RECLAIM_FAILED)]		= "zone_reclaim_failed",
  #endif
 -	"pginodesteal",
 -	"slabs_scanned",
 -	"kswapd_inodesteal",
 -	"kswapd_low_wmark_hit_quickly",
 -	"kswapd_high_wmark_hit_quickly",
 -	"pageoutrun",
 +	[I(PGINODESTEAL)]			= "pginodesteal",
 +	[I(SLABS_SCANNED)]			= "slabs_scanned",
 +	[I(KSWAPD_INODESTEAL)]			= "kswapd_inodesteal",
 +	[I(KSWAPD_LOW_WMARK_HIT_QUICKLY)]	= "kswapd_low_wmark_hit_quickly",
 +	[I(KSWAPD_HIGH_WMARK_HIT_QUICKLY)]	= "kswapd_high_wmark_hit_quickly",
 +	[I(PAGEOUTRUN)]				= "pageoutrun",
  
 -	"pgrotated",
 +	[I(PGROTATED)]				= "pgrotated",
  
 -	"drop_pagecache",
 -	"drop_slab",
 -	"oom_kill",
 +	[I(DROP_PAGECACHE)]			= "drop_pagecache",
 +	[I(DROP_SLAB)]				= "drop_slab",
 +	[I(OOM_KILL)]				= "oom_kill",
  
  #ifdef CONFIG_NUMA_BALANCING
 -	"numa_pte_updates",
 -	"numa_huge_pte_updates",
 -	"numa_hint_faults",
 -	"numa_hint_faults_local",
 -	"numa_pages_migrated",
 +	[I(NUMA_PTE_UPDATES)]			= "numa_pte_updates",
 +	[I(NUMA_HUGE_PTE_UPDATES)]		= "numa_huge_pte_updates",
 +	[I(NUMA_HINT_FAULTS)]			= "numa_hint_faults",
 +	[I(NUMA_HINT_FAULTS_LOCAL)]		= "numa_hint_faults_local",
 +	[I(NUMA_PAGE_MIGRATE)]			= "numa_pages_migrated",
- 	[I(NUMA_TASK_MIGRATE)]			= "numa_task_migrated",
- 	[I(NUMA_TASK_SWAP)]			= "numa_task_swapped",
  #endif
  #ifdef CONFIG_MIGRATION
 -	"pgmigrate_success",
 -	"pgmigrate_fail",
 -	"thp_migration_success",
 -	"thp_migration_fail",
 -	"thp_migration_split",
 +	[I(PGMIGRATE_SUCCESS)]			= "pgmigrate_success",
 +	[I(PGMIGRATE_FAIL)]			= "pgmigrate_fail",
 +	[I(THP_MIGRATION_SUCCESS)]		= "thp_migration_success",
 +	[I(THP_MIGRATION_FAIL)]			= "thp_migration_fail",
 +	[I(THP_MIGRATION_SPLIT)]		= "thp_migration_split",
  #endif
  #ifdef CONFIG_COMPACTION
 -	"compact_migrate_scanned",
 -	"compact_free_scanned",
 -	"compact_isolated",
 -	"compact_stall",
 -	"compact_fail",
 -	"compact_success",
 -	"compact_daemon_wake",
 -	"compact_daemon_migrate_scanned",
 -	"compact_daemon_free_scanned",
 +	[I(COMPACTMIGRATE_SCANNED)]		= "compact_migrate_scanned",
 +	[I(COMPACTFREE_SCANNED)]		= "compact_free_scanned",
 +	[I(COMPACTISOLATED)]			= "compact_isolated",
 +	[I(COMPACTSTALL)]			= "compact_stall",
 +	[I(COMPACTFAIL)]			= "compact_fail",
 +	[I(COMPACTSUCCESS)]			= "compact_success",
 +	[I(KCOMPACTD_WAKE)]			= "compact_daemon_wake",
 +	[I(KCOMPACTD_MIGRATE_SCANNED)]		= "compact_daemon_migrate_scanned",
 +	[I(KCOMPACTD_FREE_SCANNED)]		= "compact_daemon_free_scanned",
  #endif
  
  #ifdef CONFIG_HUGETLB_PAGE

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Re: linux-next: manual merge of the tip tree with the mm-unstable tree

[Andrew Morton]

On Thu, 10 Jul 2025 14:30:52 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:

> Today's linux-next merge of the tip tree got a conflict in:
> 
>   mm/vmstat.c
> 
> between commit:
> 
>   954386324a11 ("mm/vmstat: utilize designated initializers for the vmstat_text array")

Oh dear god that patch will be the death of me.  Everyone likes to mess
with the vmstat array!

> from the mm-unstable tree and commit:
> 
>   8662a3e5e9c4 ("Revert "sched/numa: add statistics of numa balance task"")
> 
> from the tip tree.
> 
> I fixed it up (see below - search for NUMA_BALANCING) and can carry the
> fix as necessary. This is now fixed as far as linux-next is concerned,
> but any non trivial conflicts should be mentioned to your upstream
> maintainer when your tree is submitted for merging.  You may also want
> to consider cooperating with the maintainer of the conflicting tree to
> minimise any particularly complex conflicts.
> 
> I assume that this will go away when the Revert above goes into Linus'
> tree (or returns to the mm-hotfixes tre).

Yep, thanks.

linux-next: manual merge of the tip tree with the mm-unstable tree

[Stephen Rothwell]

[-- Attachment #1: Type: text/plain, Size: 2031 bytes --]

Hi all,

Today's linux-next merge of the tip tree got a conflict in:

  arch/x86/mm/pat/memtype.c

between commit:

  f387f960a89a ("x86/mm/pat: factor out setting cachemode into pgprot_set_cachemode()")

from the mm-unstable tree and commit:

  1b3f2bd04d90 ("x86/devmem: Remove duplicate range_is_allowed() definition")

from the tip tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc arch/x86/mm/pat/memtype.c
index ccc55c00b4c8,c97b527c66fe..000000000000
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@@ -773,39 -775,6 +775,12 @@@ pgprot_t phys_mem_access_prot(struct fi
  	return vma_prot;
  }
  
- #ifdef CONFIG_STRICT_DEVMEM
- /* This check is done in drivers/char/mem.c in case of STRICT_DEVMEM */
- static inline int range_is_allowed(unsigned long pfn, unsigned long size)
- {
- 	return 1;
- }
- #else
- /* This check is needed to avoid cache aliasing when PAT is enabled */
- static inline int range_is_allowed(unsigned long pfn, unsigned long size)
- {
- 	u64 from = ((u64)pfn) << PAGE_SHIFT;
- 	u64 to = from + size;
- 	u64 cursor = from;
- 
- 	if (!pat_enabled())
- 		return 1;
- 
- 	while (cursor < to) {
- 		if (!devmem_is_allowed(pfn))
- 			return 0;
- 		cursor += PAGE_SIZE;
- 		pfn++;
- 	}
- 	return 1;
- }
- #endif /* CONFIG_STRICT_DEVMEM */
- 
 +static inline void pgprot_set_cachemode(pgprot_t *prot, enum page_cache_mode pcm)
 +{
 +	*prot = __pgprot((pgprot_val(*prot) & ~_PAGE_CACHE_MASK) |
 +			 cachemode2protval(pcm));
 +}
 +
  int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
  				unsigned long size, pgprot_t *vma_prot)
  {

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Re: linux-next: manual merge of the tip tree with the mm-unstable tree

[Stephen Rothwell]

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Hi all,

On Thu, 15 May 2025 15:11:02 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> Today's linux-next merge of the tip tree got a conflict in:
> 
>   arch/x86/mm/pat/memtype.c
> 
> between commit:
> 
>   f387f960a89a ("x86/mm/pat: factor out setting cachemode into pgprot_set_cachemode()")
> 
> from the mm-unstable tree and commit:
> 
>   1b3f2bd04d90 ("x86/devmem: Remove duplicate range_is_allowed() definition")
> 
> from the tip tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> 
> diff --cc arch/x86/mm/pat/memtype.c
> index ccc55c00b4c8,c97b527c66fe..000000000000
> --- a/arch/x86/mm/pat/memtype.c
> +++ b/arch/x86/mm/pat/memtype.c
> @@@ -773,39 -775,6 +775,12 @@@ pgprot_t phys_mem_access_prot(struct fi
>   	return vma_prot;
>   }
>   
> - #ifdef CONFIG_STRICT_DEVMEM
> - /* This check is done in drivers/char/mem.c in case of STRICT_DEVMEM */
> - static inline int range_is_allowed(unsigned long pfn, unsigned long size)
> - {
> - 	return 1;
> - }
> - #else
> - /* This check is needed to avoid cache aliasing when PAT is enabled */
> - static inline int range_is_allowed(unsigned long pfn, unsigned long size)
> - {
> - 	u64 from = ((u64)pfn) << PAGE_SHIFT;
> - 	u64 to = from + size;
> - 	u64 cursor = from;
> - 
> - 	if (!pat_enabled())
> - 		return 1;
> - 
> - 	while (cursor < to) {
> - 		if (!devmem_is_allowed(pfn))
> - 			return 0;
> - 		cursor += PAGE_SIZE;
> - 		pfn++;
> - 	}
> - 	return 1;
> - }
> - #endif /* CONFIG_STRICT_DEVMEM */
> - 
>  +static inline void pgprot_set_cachemode(pgprot_t *prot, enum page_cache_mode pcm)
>  +{
>  +	*prot = __pgprot((pgprot_val(*prot) & ~_PAGE_CACHE_MASK) |
>  +			 cachemode2protval(pcm));
>  +}
>  +
>   int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
>   				unsigned long size, pgprot_t *vma_prot)
>   {

This is now a conflict between the mm-stable tree and Linus' tree.

-- 
Cheers,
Stephen Rothwell

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linux-next: manual merge of the tip tree with the mm-unstable tree

[Mark Brown]

Hi all,

Today's linux-next merge of the tip tree got a conflict in:

  mm/gup.c

between commit:

  2353d85b4e9c2 ("mm/gup: disallow FOLL_LONGTERM GUP-nonfast writing to file-backed mappings")

from the mm-unstable tree and commit:

  75818f575af6d ("mm: Don't allow write GUPs to shadow stack memory")

from the tip tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

diff --cc mm/gup.c
index 802dbe46a401a,80258a640135a..0000000000000
--- a/mm/gup.c
+++ b/mm/gup.c
@@@ -1017,11 -978,7 +1017,11 @@@ static int check_vma_flags(struct vm_ar
  		return -EFAULT;
  
  	if (write) {
 +		if (!vma_anon &&
 +		    !writable_file_mapping_allowed(vma, gup_flags))
 +			return -EFAULT;
 +
- 		if (!(vm_flags & VM_WRITE)) {
+ 		if (!(vm_flags & VM_WRITE) || (vm_flags & VM_SHADOW_STACK)) {
  			if (!(gup_flags & FOLL_FORCE))
  				return -EFAULT;
  			/* hugetlb does not support FOLL_FORCE|FOLL_WRITE. */