[PATCH 2/5] x86: Remove custom definition of mk_pte()

[Matthew Wilcox (Oracle)]

Move the shadow stack check to pfn_pte() which lets us use the common
definition of mk_pte().

Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
 arch/x86/include/asm/pgtable.h | 19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index a7c1e9cfea41..59baf4e183b2 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -760,6 +760,9 @@ static inline pgprotval_t check_pgprot(pgprot_t pgprot)
 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 {
 	phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
+	/* This bit combination is used to mark shadow stacks */
+	WARN_ON_ONCE((pgprot_val(pgprot) & (_PAGE_DIRTY | _PAGE_RW)) ==
+			_PAGE_DIRTY);
 	pfn ^= protnone_mask(pgprot_val(pgprot));
 	pfn &= PTE_PFN_MASK;
 	return __pte(pfn | check_pgprot(pgprot));
@@ -1056,22 +1059,6 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
  */
 #define pmd_page(pmd)	pfn_to_page(pmd_pfn(pmd))
 
-/*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
- *
- * (Currently stuck as a macro because of indirect forward reference
- * to linux/mm.h:page_to_nid())
- */
-#define mk_pte(page, pgprot)						  \
-({									  \
-	pgprot_t __pgprot = pgprot;					  \
-									  \
-	WARN_ON_ONCE((pgprot_val(__pgprot) & (_PAGE_DIRTY | _PAGE_RW)) == \
-		    _PAGE_DIRTY);					  \
-	pfn_pte(page_to_pfn(page), __pgprot);				  \
-})
-
 static inline int pmd_bad(pmd_t pmd)
 {
 	return (pmd_flags(pmd) & ~(_PAGE_USER | _PAGE_ACCESSED)) !=
-- 
2.43.0