+ mm-allow-thp-orders-for-pfnmaps.patch added to mm-unstable branch

+ mm-allow-thp-orders-for-pfnmaps.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: allow THP orders for PFNMAPs
has been added to the -mm mm-unstable branch.  Its filename is
     mm-allow-thp-orders-for-pfnmaps.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-allow-thp-orders-for-pfnmaps.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: Peter Xu <peterx@redhat.com>
Subject: mm: allow THP orders for PFNMAPs
Date: Mon, 26 Aug 2024 16:43:38 -0400

This enables PFNMAPs to be mapped at either pmd/pud layers.  Generalize the
dax case into vma_is_special_huge() so as to cover both.  Meanwhile, rename
the macro to THP_ORDERS_ALL_SPECIAL.

Link: https://lkml.kernel.org/r/20240826204353.2228736-5-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/huge_mm.h |    6 +++---
 mm/huge_memory.c        |    4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

--- a/include/linux/huge_mm.h~mm-allow-thp-orders-for-pfnmaps
+++ a/include/linux/huge_mm.h
@@ -76,9 +76,9 @@ extern struct kobj_attribute thpsize_shm
 /*
  * Mask of all large folio orders supported for file THP. Folios in a DAX
  * file is never split and the MAX_PAGECACHE_ORDER limit does not apply to
- * it.
+ * it.  Same to PFNMAPs where there's neither page* nor pagecache.
  */
-#define THP_ORDERS_ALL_FILE_DAX		\
+#define THP_ORDERS_ALL_SPECIAL		\
 	(BIT(PMD_ORDER) | BIT(PUD_ORDER))
 #define THP_ORDERS_ALL_FILE_DEFAULT	\
 	((BIT(MAX_PAGECACHE_ORDER + 1) - 1) & ~BIT(0))
@@ -87,7 +87,7 @@ extern struct kobj_attribute thpsize_shm
  * Mask of all large folio orders supported for THP.
  */
 #define THP_ORDERS_ALL	\
-	(THP_ORDERS_ALL_ANON | THP_ORDERS_ALL_FILE_DAX | THP_ORDERS_ALL_FILE_DEFAULT)
+	(THP_ORDERS_ALL_ANON | THP_ORDERS_ALL_SPECIAL | THP_ORDERS_ALL_FILE_DEFAULT)
 
 #define TVA_SMAPS		(1 << 0)	/* Will be used for procfs */
 #define TVA_IN_PF		(1 << 1)	/* Page fault handler */
--- a/mm/huge_memory.c~mm-allow-thp-orders-for-pfnmaps
+++ a/mm/huge_memory.c
@@ -96,8 +96,8 @@ unsigned long __thp_vma_allowable_orders
 	/* Check the intersection of requested and supported orders. */
 	if (vma_is_anonymous(vma))
 		supported_orders = THP_ORDERS_ALL_ANON;
-	else if (vma_is_dax(vma))
-		supported_orders = THP_ORDERS_ALL_FILE_DAX;
+	else if (vma_is_special_huge(vma))
+		supported_orders = THP_ORDERS_ALL_SPECIAL;
 	else
 		supported_orders = THP_ORDERS_ALL_FILE_DEFAULT;
 
_

Patches currently in -mm which might be from peterx@redhat.com are

mm-dax-dump-start-address-in-fault-handler.patch
mm-mprotect-push-mmu-notifier-to-puds.patch
mm-powerpc-add-missing-pud-helpers.patch
mm-x86-make-pud_leaf-only-care-about-pse-bit.patch
mm-x86-implement-arch_check_zapped_pud.patch
mm-x86-add-missing-pud-helpers.patch
mm-mprotect-fix-dax-pud-handlings.patch
mm-introduce-arch_supports_huge_pfnmap-and-special-bits-to-pmd-pud.patch
mm-drop-is_huge_zero_pud.patch
mm-mark-special-bits-for-huge-pfn-mappings-when-inject.patch
mm-allow-thp-orders-for-pfnmaps.patch
mm-gup-detect-huge-pfnmap-entries-in-gup-fast.patch
mm-pagewalk-check-pfnmap-for-folio_walk_start.patch
mm-fork-accept-huge-pfnmap-entries.patch
mm-always-define-pxx_pgprot.patch
mm-new-follow_pfnmap-api.patch
kvm-use-follow_pfnmap-api.patch
s390-pci_mmio-use-follow_pfnmap-api.patch
mm-x86-pat-use-the-new-follow_pfnmap-api.patch
vfio-use-the-new-follow_pfnmap-api.patch
acrn-use-the-new-follow_pfnmap-api.patch
mm-access_process_vm-use-the-new-follow_pfnmap-api.patch
mm-remove-follow_pte.patch
mm-x86-support-large-pfn-mappings.patch
mm-arm64-support-large-pfn-mappings.patch