+ mm-always-define-pxx_pgprot.patch added to mm-unstable branch

+ mm-always-define-pxx_pgprot.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: always define pxx_pgprot()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-always-define-pxx_pgprot.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-always-define-pxx_pgprot.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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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Peter Xu <peterx@redhat.com>
Subject: mm: always define pxx_pgprot()
Date: Mon, 26 Aug 2024 16:43:42 -0400

There're:

  - 8 archs (arc, arm64, include, mips, powerpc, s390, sh, x86) that
  support pte_pgprot().

  - 2 archs (x86, sparc) that support pmd_pgprot().

  - 1 arch (x86) that support pud_pgprot().

Always define them to be used in generic code, and then we don't need to
fiddle with "#ifdef"s when doing so.

Link: https://lkml.kernel.org/r/20240826204353.2228736-9-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@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: David Hildenbrand <david@redhat.com>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.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>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/include/asm/pgtable.h    |    1 +
 arch/powerpc/include/asm/pgtable.h  |    1 +
 arch/s390/include/asm/pgtable.h     |    1 +
 arch/sparc/include/asm/pgtable_64.h |    1 +
 include/linux/pgtable.h             |   12 ++++++++++++
 5 files changed, 16 insertions(+)

--- a/arch/arm64/include/asm/pgtable.h~mm-always-define-pxx_pgprot
+++ a/arch/arm64/include/asm/pgtable.h
@@ -384,6 +384,7 @@ static inline void __sync_cache_and_tags
 /*
  * Select all bits except the pfn
  */
+#define pte_pgprot pte_pgprot
 static inline pgprot_t pte_pgprot(pte_t pte)
 {
 	unsigned long pfn = pte_pfn(pte);
--- a/arch/powerpc/include/asm/pgtable.h~mm-always-define-pxx_pgprot
+++ a/arch/powerpc/include/asm/pgtable.h
@@ -65,6 +65,7 @@ static inline unsigned long pte_pfn(pte_
 /*
  * Select all bits except the pfn
  */
+#define pte_pgprot pte_pgprot
 static inline pgprot_t pte_pgprot(pte_t pte)
 {
 	unsigned long pte_flags;
--- a/arch/s390/include/asm/pgtable.h~mm-always-define-pxx_pgprot
+++ a/arch/s390/include/asm/pgtable.h
@@ -955,6 +955,7 @@ static inline int pte_unused(pte_t pte)
  * young/old accounting is not supported, i.e _PAGE_PROTECT and _PAGE_INVALID
  * must not be set.
  */
+#define pte_pgprot pte_pgprot
 static inline pgprot_t pte_pgprot(pte_t pte)
 {
 	unsigned long pte_flags = pte_val(pte) & _PAGE_CHG_MASK;
--- a/arch/sparc/include/asm/pgtable_64.h~mm-always-define-pxx_pgprot
+++ a/arch/sparc/include/asm/pgtable_64.h
@@ -783,6 +783,7 @@ static inline pmd_t pmd_mkwrite_novma(pm
 	return __pmd(pte_val(pte));
 }
 
+#define pmd_pgprot pmd_pgprot
 static inline pgprot_t pmd_pgprot(pmd_t entry)
 {
 	unsigned long val = pmd_val(entry);
--- a/include/linux/pgtable.h~mm-always-define-pxx_pgprot
+++ a/include/linux/pgtable.h
@@ -1956,6 +1956,18 @@ typedef unsigned int pgtbl_mod_mask;
 #define MAX_PTRS_PER_P4D PTRS_PER_P4D
 #endif
 
+#ifndef pte_pgprot
+#define pte_pgprot(x) ((pgprot_t) {0})
+#endif
+
+#ifndef pmd_pgprot
+#define pmd_pgprot(x) ((pgprot_t) {0})
+#endif
+
+#ifndef pud_pgprot
+#define pud_pgprot(x) ((pgprot_t) {0})
+#endif
+
 /* description of effects of mapping type and prot in current implementation.
  * this is due to the limited x86 page protection hardware.  The expected
  * behavior is in parens:
_

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