[PATCH v3 05/26] x86: move PAE PMD preallocation defines to header

[Brendan Jackman]

In a subsequent patch these defines will need to be referenced from a new
file, move them as a separate patch for easy review.

The comments have style violations (personal pronouns etc), do not fix
them as this is just code movement.

No functional change intended.

Signed-off-by: Brendan Jackman <jackmanb@xxxxxxxxxx>
---
 arch/x86/include/asm/page.h | 32 ++++++++++++++++++++++++++++++++
 arch/x86/mm/pgtable.c       | 29 -----------------------------
 2 files changed, 32 insertions(+), 29 deletions(-)

diff --git a/arch/x86/include/asm/page.h b/arch/x86/include/asm/page.h
index 416dc88e35c15..4de4715c3b40f 100644
--- a/arch/x86/include/asm/page.h
+++ b/arch/x86/include/asm/page.h
@@ -78,6 +78,38 @@ static __always_inline u64 __is_canonical_address(u64 vaddr, u8 vaddr_bits)
 	return __canonical_address(vaddr, vaddr_bits) == vaddr;
 }
 
+#ifdef CONFIG_X86_PAE
+
+/*
+ * In PAE mode, we need to do a cr3 reload (=tlb flush) when
+ * updating the top-level pagetable entries to guarantee the
+ * processor notices the update.  Since this is expensive, and
+ * all 4 top-level entries are used almost immediately in a
+ * new process's life, we just pre-populate them here.
+ */
+#define PREALLOCATED_PMDS	PTRS_PER_PGD
+/*
+ * "USER_PMDS" are the PMDs for the user copy of the page tables when
+ * PTI is enabled. They do not exist when PTI is disabled.  Note that
+ * this is distinct from the user _portion_ of the kernel page tables
+ * which always exists.
+ *
+ * We allocate separate PMDs for the kernel part of the user page-table
+ * when PTI is enabled. We need them to map the per-process LDT into the
+ * user-space page-table.
+ */
+#define PREALLOCATED_USER_PMDS (boot_cpu_has(X86_FEATURE_PTI) ? KERNEL_PGD_PTRS : 0)
+#define MAX_PREALLOCATED_USER_PMDS KERNEL_PGD_PTRS
+
+#else  /* !CONFIG_X86_PAE */
+
+/* No need to prepopulate any pagetable entries in non-PAE modes. */
+#define PREALLOCATED_PMDS	0
+#define PREALLOCATED_USER_PMDS	0
+#define MAX_PREALLOCATED_USER_PMDS 0
+
+#endif	/* CONFIG_X86_PAE */
+
 #endif	/* __ASSEMBLER__ */
 
 #include <asm-generic/memory_model.h>
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index fdd3709509946..8f3505b1eefec 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -100,29 +100,6 @@ static void pgd_dtor(pgd_t *pgd)
 }
 
 #ifdef CONFIG_X86_PAE
-/*
- * In PAE mode, we need to do a cr3 reload (=tlb flush) when
- * updating the top-level pagetable entries to guarantee the
- * processor notices the update.  Since this is expensive, and
- * all 4 top-level entries are used almost immediately in a
- * new process's life, we just pre-populate them here.
- */
-#define PREALLOCATED_PMDS	PTRS_PER_PGD
-
-/*
- * "USER_PMDS" are the PMDs for the user copy of the page tables when
- * PTI is enabled. They do not exist when PTI is disabled.  Note that
- * this is distinct from the user _portion_ of the kernel page tables
- * which always exists.
- *
- * We allocate separate PMDs for the kernel part of the user page-table
- * when PTI is enabled. We need them to map the per-process LDT into the
- * user-space page-table.
- */
-#define PREALLOCATED_USER_PMDS	 (boot_cpu_has(X86_FEATURE_PTI) ? \
-					KERNEL_PGD_PTRS : 0)
-#define MAX_PREALLOCATED_USER_PMDS KERNEL_PGD_PTRS
-
 void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
 {
 	paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
@@ -139,12 +116,6 @@ void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
 	 */
 	flush_tlb_mm(mm);
 }
-#else  /* !CONFIG_X86_PAE */
-
-/* No need to prepopulate any pagetable entries in non-PAE modes. */
-#define PREALLOCATED_PMDS	0
-#define PREALLOCATED_USER_PMDS	 0
-#define MAX_PREALLOCATED_USER_PMDS 0
 #endif	/* CONFIG_X86_PAE */
 
 static void free_pmds(struct mm_struct *mm, pmd_t *pmds[], int count)

-- 
2.54.0