mm: rename uffd-wp PTE accessors to uffd

Userfaultfd RWP will reuse the uffd-wp PTE bit to mark access-tracking
PTEs, alongside the write-protected ones it already marks.  The bit's
meaning now depends on the VMA flag (WP or RWP), not on its name.

Rename the kernel-internal names that describe the bit:

  - pte/pmd/huge_pte accessors (and swap variants)
  - pgtable_supports_uffd() capability query
  - SCAN_PTE_UFFD khugepaged enum

The ftrace string emitted by mm_khugepaged_scan_pmd for this enum is
kept as "pte_uffd_wp" so existing trace-based tooling keeps matching.

Pure mechanical rename -- no behavior change.

Link: https://lore.kernel.org/20260708111417.173443-4-kirill@shutemov.name
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Assisted-by: Claude:claude-opus-4-6
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: James Houghton <jthoughton@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

4 files changed, 51 insertions, 51 deletions

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 0e490a2cf665..a2681d755358 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -341,17 +341,17 @@ static inline pmd_t pmd_mknoncont(pmd_t pmd)
 }
 
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
-static inline int pte_uffd_wp(pte_t pte)
+static inline int pte_uffd(pte_t pte)
 {
 	return !!(pte_val(pte) & PTE_UFFD);
 }
 
-static inline pte_t pte_mkuffd_wp(pte_t pte)
+static inline pte_t pte_mkuffd(pte_t pte)
 {
 	return pte_wrprotect(set_pte_bit(pte, __pgprot(PTE_UFFD)));
 }
 
-static inline pte_t pte_clear_uffd_wp(pte_t pte)
+static inline pte_t pte_clear_uffd(pte_t pte)
 {
 	return clear_pte_bit(pte, __pgprot(PTE_UFFD));
 }
@@ -537,17 +537,17 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
 }
 
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
-static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
+static inline pte_t pte_swp_mkuffd(pte_t pte)
 {
 	return set_pte_bit(pte, __pgprot(PTE_SWP_UFFD));
 }
 
-static inline int pte_swp_uffd_wp(pte_t pte)
+static inline int pte_swp_uffd(pte_t pte)
 {
 	return !!(pte_val(pte) & PTE_SWP_UFFD);
 }
 
-static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
+static inline pte_t pte_swp_clear_uffd(pte_t pte)
 {
 	return clear_pte_bit(pte, __pgprot(PTE_SWP_UFFD));
 }
@@ -590,13 +590,13 @@ static inline int pmd_protnone(pmd_t pmd)
 #define pmd_mkvalid_k(pmd)	pte_pmd(pte_mkvalid_k(pmd_pte(pmd)))
 #define pmd_mkinvalid(pmd)	pte_pmd(pte_mkinvalid(pmd_pte(pmd)))
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
-#define pmd_uffd_wp(pmd)	pte_uffd_wp(pmd_pte(pmd))
-#define pmd_mkuffd_wp(pmd)	pte_pmd(pte_mkuffd_wp(pmd_pte(pmd)))
-#define pmd_clear_uffd_wp(pmd)	pte_pmd(pte_clear_uffd_wp(pmd_pte(pmd)))
-#define pmd_swp_uffd_wp(pmd)	pte_swp_uffd_wp(pmd_pte(pmd))
-#define pmd_swp_mkuffd_wp(pmd)	pte_pmd(pte_swp_mkuffd_wp(pmd_pte(pmd)))
-#define pmd_swp_clear_uffd_wp(pmd) \
-				pte_pmd(pte_swp_clear_uffd_wp(pmd_pte(pmd)))
+#define pmd_uffd(pmd)	pte_uffd(pmd_pte(pmd))
+#define pmd_mkuffd(pmd)	pte_pmd(pte_mkuffd(pmd_pte(pmd)))
+#define pmd_clear_uffd(pmd)	pte_pmd(pte_clear_uffd(pmd_pte(pmd)))
+#define pmd_swp_uffd(pmd)	pte_swp_uffd(pmd_pte(pmd))
+#define pmd_swp_mkuffd(pmd)	pte_pmd(pte_swp_mkuffd(pmd_pte(pmd)))
+#define pmd_swp_clear_uffd(pmd) \
+				pte_pmd(pte_swp_clear_uffd(pmd_pte(pmd)))
 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
 
 #define pmd_write(pmd)		pte_write(pmd_pte(pmd))
@@ -1512,7 +1512,7 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
  * Encode and decode a swap entry:
  *	bits 0-1:	present (must be zero)
  *	bits 2:		remember PG_anon_exclusive
- *	bit  3:		remember uffd-wp state
+ *	bit  3:		remember uffd state
  *	bits 6-10:	swap type
  *	bit  11:	PTE_PRESENT_INVALID (must be zero)
  *	bits 12-61:	swap offset
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index ae4307cbaed5..7f21742b2b6a 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -410,35 +410,35 @@ static inline pte_t pte_wrprotect(pte_t pte)
 }
 
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
-#define pgtable_supports_uffd_wp()	\
+#define pgtable_supports_uffd()	\
 	riscv_has_extension_unlikely(RISCV_ISA_EXT_SVRSW60T59B)
 
-static inline bool pte_uffd_wp(pte_t pte)
+static inline bool pte_uffd(pte_t pte)
 {
 	return !!(pte_val(pte) & _PAGE_UFFD);
 }
 
-static inline pte_t pte_mkuffd_wp(pte_t pte)
+static inline pte_t pte_mkuffd(pte_t pte)
 {
 	return pte_wrprotect(__pte(pte_val(pte) | _PAGE_UFFD));
 }
 
-static inline pte_t pte_clear_uffd_wp(pte_t pte)
+static inline pte_t pte_clear_uffd(pte_t pte)
 {
 	return __pte(pte_val(pte) & ~(_PAGE_UFFD));
 }
 
-static inline bool pte_swp_uffd_wp(pte_t pte)
+static inline bool pte_swp_uffd(pte_t pte)
 {
 	return !!(pte_val(pte) & _PAGE_SWP_UFFD);
 }
 
-static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
+static inline pte_t pte_swp_mkuffd(pte_t pte)
 {
 	return __pte(pte_val(pte) | _PAGE_SWP_UFFD);
 }
 
-static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
+static inline pte_t pte_swp_clear_uffd(pte_t pte)
 {
 	return __pte(pte_val(pte) & ~(_PAGE_SWP_UFFD));
 }
@@ -896,34 +896,34 @@ static inline pud_t pud_mkspecial(pud_t pud)
 #endif
 
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
-static inline bool pmd_uffd_wp(pmd_t pmd)
+static inline bool pmd_uffd(pmd_t pmd)
 {
-	return pte_uffd_wp(pmd_pte(pmd));
+	return pte_uffd(pmd_pte(pmd));
 }
 
-static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
+static inline pmd_t pmd_mkuffd(pmd_t pmd)
 {
-	return pte_pmd(pte_mkuffd_wp(pmd_pte(pmd)));
+	return pte_pmd(pte_mkuffd(pmd_pte(pmd)));
 }
 
-static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
+static inline pmd_t pmd_clear_uffd(pmd_t pmd)
 {
-	return pte_pmd(pte_clear_uffd_wp(pmd_pte(pmd)));
+	return pte_pmd(pte_clear_uffd(pmd_pte(pmd)));
 }
 
-static inline bool pmd_swp_uffd_wp(pmd_t pmd)
+static inline bool pmd_swp_uffd(pmd_t pmd)
 {
-	return pte_swp_uffd_wp(pmd_pte(pmd));
+	return pte_swp_uffd(pmd_pte(pmd));
 }
 
-static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
+static inline pmd_t pmd_swp_mkuffd(pmd_t pmd)
 {
-	return pte_pmd(pte_swp_mkuffd_wp(pmd_pte(pmd)));
+	return pte_pmd(pte_swp_mkuffd(pmd_pte(pmd)));
 }
 
-static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
+static inline pmd_t pmd_swp_clear_uffd(pmd_t pmd)
 {
-	return pte_pmd(pte_swp_clear_uffd_wp(pmd_pte(pmd)));
+	return pte_pmd(pte_swp_clear_uffd(pmd_pte(pmd)));
 }
 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
 
diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
index e33a5b587ee4..02821a7d9d91 100644
--- a/arch/s390/include/asm/hugetlb.h
+++ b/arch/s390/include/asm/hugetlb.h
@@ -77,20 +77,20 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 	__set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
 }
 
-#define __HAVE_ARCH_HUGE_PTE_MKUFFD_WP
-static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
+#define __HAVE_ARCH_HUGE_PTE_MKUFFD
+static inline pte_t huge_pte_mkuffd(pte_t pte)
 {
 	return pte;
 }
 
-#define __HAVE_ARCH_HUGE_PTE_CLEAR_UFFD_WP
-static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
+#define __HAVE_ARCH_HUGE_PTE_CLEAR_UFFD
+static inline pte_t huge_pte_clear_uffd(pte_t pte)
 {
 	return pte;
 }
 
-#define __HAVE_ARCH_HUGE_PTE_UFFD_WP
-static inline int huge_pte_uffd_wp(pte_t pte)
+#define __HAVE_ARCH_HUGE_PTE_UFFD
+static inline int huge_pte_uffd(pte_t pte)
 {
 	return 0;
 }
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 54432c308f26..8e0018fadd14 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -411,17 +411,17 @@ static inline pte_t pte_wrprotect(pte_t pte)
 }
 
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
-static inline int pte_uffd_wp(pte_t pte)
+static inline int pte_uffd(pte_t pte)
 {
 	return pte_flags(pte) & _PAGE_UFFD;
 }
 
-static inline pte_t pte_mkuffd_wp(pte_t pte)
+static inline pte_t pte_mkuffd(pte_t pte)
 {
 	return pte_wrprotect(pte_set_flags(pte, _PAGE_UFFD));
 }
 
-static inline pte_t pte_clear_uffd_wp(pte_t pte)
+static inline pte_t pte_clear_uffd(pte_t pte)
 {
 	return pte_clear_flags(pte, _PAGE_UFFD);
 }
@@ -526,17 +526,17 @@ static inline pmd_t pmd_wrprotect(pmd_t pmd)
 }
 
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
-static inline int pmd_uffd_wp(pmd_t pmd)
+static inline int pmd_uffd(pmd_t pmd)
 {
 	return pmd_flags(pmd) & _PAGE_UFFD;
 }
 
-static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
+static inline pmd_t pmd_mkuffd(pmd_t pmd)
 {
 	return pmd_wrprotect(pmd_set_flags(pmd, _PAGE_UFFD));
 }
 
-static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
+static inline pmd_t pmd_clear_uffd(pmd_t pmd)
 {
 	return pmd_clear_flags(pmd, _PAGE_UFFD);
 }
@@ -1560,32 +1560,32 @@ static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
 #endif
 
 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
-static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
+static inline pte_t pte_swp_mkuffd(pte_t pte)
 {
 	return pte_set_flags(pte, _PAGE_SWP_UFFD);
 }
 
-static inline int pte_swp_uffd_wp(pte_t pte)
+static inline int pte_swp_uffd(pte_t pte)
 {
 	return pte_flags(pte) & _PAGE_SWP_UFFD;
 }
 
-static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
+static inline pte_t pte_swp_clear_uffd(pte_t pte)
 {
 	return pte_clear_flags(pte, _PAGE_SWP_UFFD);
 }
 
-static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
+static inline pmd_t pmd_swp_mkuffd(pmd_t pmd)
 {
 	return pmd_set_flags(pmd, _PAGE_SWP_UFFD);
 }
 
-static inline int pmd_swp_uffd_wp(pmd_t pmd)
+static inline int pmd_swp_uffd(pmd_t pmd)
 {
 	return pmd_flags(pmd) & _PAGE_SWP_UFFD;
 }
 
-static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
+static inline pmd_t pmd_swp_clear_uffd(pmd_t pmd)
 {
 	return pmd_clear_flags(pmd, _PAGE_SWP_UFFD);
 }