mm/special: create generic fallbacks for pte_special() and pte_mkspec…

…ial() Currently there are many platforms that dont enable ARCH_HAS_PTE_SPECIAL but required to define quite similar fallback stubs for special page table entry helpers such as pte_special() and pte_mkspecial(), as they get build in generic MM without a config check. This creates two generic fallback stub definitions for these helpers, eliminating much code duplication. mips platform has a special case where pte_special() and pte_mkspecial() visibility is wider than what ARCH_HAS_PTE_SPECIAL enablement requires. This restricts those symbol visibility in order to avoid redefinitions which is now exposed through this new generic stubs and subsequent build failure. arm platform set_pte_at() definition needs to be moved into a C file just to prevent a build failure. [[email protected]: use defined(CONFIG_ARCH_HAS_PTE_SPECIAL) in mips per Thomas] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Anshuman Khandual <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Acked-by: Guo Ren <[email protected]> [csky] Acked-by: Geert Uytterhoeven <[email protected]> [m68k] Acked-by: Stafford Horne <[email protected]> [openrisc] Acked-by: Helge Deller <[email protected]> [parisc] Cc: Richard Henderson <[email protected]> Cc: Ivan Kokshaysky <[email protected]> Cc: Matt Turner <[email protected]> Cc: Russell King <[email protected]> Cc: Brian Cain <[email protected]> Cc: Tony Luck <[email protected]> Cc: Fenghua Yu <[email protected]> Cc: Sam Creasey <[email protected]> Cc: Michal Simek <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: Paul Burton <[email protected]> Cc: Nick Hu <[email protected]> Cc: Greentime Hu <[email protected]> Cc: Vincent Chen <[email protected]> Cc: Ley Foon Tan <[email protected]> Cc: Jonas Bonn <[email protected]> Cc: Stefan Kristiansson <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Jeff Dike <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Anton Ivanov <[email protected]> Cc: Guan Xuetao <[email protected]> Cc: Chris Zankel <[email protected]> Cc: Max Filippov <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Linus Torvalds <[email protected]>
josf · Apr 10, 2020 · 78e7c5a · 78e7c5a
1 parent 6cb4d9a
commit 78e7c5a
Show file tree

Hide file tree

Showing 21 changed files with 58 additions and 95 deletions.
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
@@ -268,15 +268,13 @@ extern inline void pud_clear(pud_t * pudp)	{ pud_val(*pudp) = 0; }
 extern inline int pte_write(pte_t pte)		{ return !(pte_val(pte) & _PAGE_FOW); }
 extern inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
 extern inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
-extern inline int pte_special(pte_t pte)	{ return 0; }
 
 extern inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) |= _PAGE_FOW; return pte; }
 extern inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
 extern inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~(__ACCESS_BITS); return pte; }
 extern inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) &= ~_PAGE_FOW; return pte; }
 extern inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= __DIRTY_BITS; return pte; }
 extern inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= __ACCESS_BITS; return pte; }
-extern inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
 
 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
 

diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h
@@ -211,8 +211,6 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
 #define pmd_addr_end(addr,end) (end)
 
 #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext)
-#define pte_special(pte)	(0)
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 
 /*
  * We don't have huge page support for short descriptors, for the moment

diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
@@ -243,19 +243,8 @@ static inline void __sync_icache_dcache(pte_t pteval)
 extern void __sync_icache_dcache(pte_t pteval);
 #endif
 
-static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
-			      pte_t *ptep, pte_t pteval)
-{
-	unsigned long ext = 0;
-
-	if (addr < TASK_SIZE && pte_valid_user(pteval)) {
-		if (!pte_special(pteval))
-			__sync_icache_dcache(pteval);
-		ext |= PTE_EXT_NG;
-	}
-
-	set_pte_ext(ptep, pteval, ext);
-}
+void set_pte_at(struct mm_struct *mm, unsigned long addr,
+		      pte_t *ptep, pte_t pteval);
 
 static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
 {

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
@@ -1646,3 +1646,17 @@ void __init early_mm_init(const struct machine_desc *mdesc)
 	build_mem_type_table();
 	early_paging_init(mdesc);
 }
+
+void set_pte_at(struct mm_struct *mm, unsigned long addr,
+			      pte_t *ptep, pte_t pteval)
+{
+	unsigned long ext = 0;
+
+	if (addr < TASK_SIZE && pte_valid_user(pteval)) {
+		if (!pte_special(pteval))
+			__sync_icache_dcache(pteval);
+		ext |= PTE_EXT_NG;
+	}
+
+	set_pte_ext(ptep, pteval, ext);
+}
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
@@ -110,9 +110,6 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 extern void load_pgd(unsigned long pg_dir);
 extern pte_t invalid_pte_table[PTRS_PER_PTE];
 
-static inline int pte_special(pte_t pte) { return 0; }
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
-
 static inline void set_pte(pte_t *p, pte_t pte)
 {
 	*p = pte;

diff --git a/arch/hexagon/include/asm/pgtable.h b/arch/hexagon/include/asm/pgtable.h
@@ -158,8 +158,6 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];  /* located in head.S */
 
 /* Seems to be zero even in architectures where the zero page is firewalled? */
 #define FIRST_USER_ADDRESS 0UL
-#define pte_special(pte)	0
-#define pte_mkspecial(pte)	(pte)
 
 /*  HUGETLB not working currently  */
 #ifdef CONFIG_HUGETLB_PAGE

diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h
@@ -298,7 +298,6 @@ extern unsigned long VMALLOC_END;
 #define pte_exec(pte)		((pte_val(pte) & _PAGE_AR_RX) != 0)
 #define pte_dirty(pte)		((pte_val(pte) & _PAGE_D) != 0)
 #define pte_young(pte)		((pte_val(pte) & _PAGE_A) != 0)
-#define pte_special(pte)	0
 
 /*
  * Note: we convert AR_RWX to AR_RX and AR_RW to AR_R by clearing the 2nd bit in the
@@ -311,7 +310,6 @@ extern unsigned long VMALLOC_END;
 #define pte_mkclean(pte)	(__pte(pte_val(pte) & ~_PAGE_D))
 #define pte_mkdirty(pte)	(__pte(pte_val(pte) | _PAGE_D))
 #define pte_mkhuge(pte)		(__pte(pte_val(pte)))
-#define pte_mkspecial(pte)	(pte)
 
 /*
  * Because ia64's Icache and Dcache is not coherent (on a cpu), we need to

diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
@@ -235,11 +235,6 @@ static inline int pte_young(pte_t pte)
 	return pte_val(pte) & CF_PAGE_ACCESSED;
 }
 
-static inline int pte_special(pte_t pte)
-{
-	return 0;
-}
-
 static inline pte_t pte_wrprotect(pte_t pte)
 {
 	pte_val(pte) &= ~CF_PAGE_WRITABLE;
@@ -312,11 +307,6 @@ static inline pte_t pte_mkcache(pte_t pte)
 	return pte;
 }
 
-static inline pte_t pte_mkspecial(pte_t pte)
-{
-	return pte;
-}
-
 #define swapper_pg_dir kernel_pg_dir
 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 

diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h
@@ -174,7 +174,6 @@ static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
 static inline int pte_write(pte_t pte)		{ return !(pte_val(pte) & _PAGE_RONLY); }
 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte)	{ return 0; }
 
 static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) |= _PAGE_RONLY; return pte; }
 static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
@@ -192,7 +191,6 @@ static inline pte_t pte_mkcache(pte_t pte)
 	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
 	return pte;
 }
-static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
 
 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
 

diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
@@ -155,7 +155,6 @@ static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
 static inline int pte_write(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_MODIFIED; }
 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte)	{ return 0; }
 
 static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
 static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
@@ -168,7 +167,6 @@ static inline pte_t pte_mknocache(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_NOCACHE
 //static inline pte_t pte_mkcache(pte_t pte)	{ pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
 // until then, use:
 static inline pte_t pte_mkcache(pte_t pte)	{ return pte; }
-static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
 
 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];

diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
@@ -77,10 +77,6 @@ extern pte_t *va_to_pte(unsigned long address);
  * Undefined behaviour if not..
  */
 
-static inline int pte_special(pte_t pte)	{ return 0; }
-
-static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
-
 /* Start and end of the vmalloc area. */
 /* Make sure to map the vmalloc area above the pinned kernel memory area
    of 32Mb.  */

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
@@ -269,6 +269,36 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
  */
 extern pgd_t swapper_pg_dir[];
 
+/*
+ * Platform specific pte_special() and pte_mkspecial() definitions
+ * are required only when ARCH_HAS_PTE_SPECIAL is enabled.
+ */
+#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
+#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
+static inline int pte_special(pte_t pte)
+{
+	return pte.pte_low & _PAGE_SPECIAL;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	pte.pte_low |= _PAGE_SPECIAL;
+	return pte;
+}
+#else
+static inline int pte_special(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SPECIAL;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_SPECIAL;
+	return pte;
+}
+#endif
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
+
 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
@@ -277,7 +307,6 @@ extern pgd_t swapper_pg_dir[];
 static inline int pte_write(pte_t pte)	{ return pte.pte_low & _PAGE_WRITE; }
 static inline int pte_dirty(pte_t pte)	{ return pte.pte_low & _PAGE_MODIFIED; }
 static inline int pte_young(pte_t pte)	{ return pte.pte_low & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return pte.pte_low & _PAGE_SPECIAL; }
 
 static inline pte_t pte_wrprotect(pte_t pte)
 {
@@ -338,17 +367,10 @@ static inline pte_t pte_mkyoung(pte_t pte)
 	}
 	return pte;
 }
-
-static inline pte_t pte_mkspecial(pte_t pte)
-{
-	pte.pte_low |= _PAGE_SPECIAL;
-	return pte;
-}
 #else
 static inline int pte_write(pte_t pte)	{ return pte_val(pte) & _PAGE_WRITE; }
 static inline int pte_dirty(pte_t pte)	{ return pte_val(pte) & _PAGE_MODIFIED; }
 static inline int pte_young(pte_t pte)	{ return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
 
 static inline pte_t pte_wrprotect(pte_t pte)
 {
@@ -392,12 +414,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
 	return pte;
 }
 
-static inline pte_t pte_mkspecial(pte_t pte)
-{
-	pte_val(pte) |= _PAGE_SPECIAL;
-	return pte;
-}
-
 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
 static inline int pte_huge(pte_t pte)	{ return pte_val(pte) & _PAGE_HUGE; }
 

diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
@@ -286,15 +286,6 @@ PTE_BIT_FUNC(mkclean, &=~_PAGE_D);
 PTE_BIT_FUNC(mkdirty, |=_PAGE_D);
 PTE_BIT_FUNC(mkold, &=~_PAGE_YOUNG);
 PTE_BIT_FUNC(mkyoung, |=_PAGE_YOUNG);
-static inline int pte_special(pte_t pte)
-{
-	return 0;
-}
-
-static inline pte_t pte_mkspecial(pte_t pte)
-{
-	return pte;
-}
 
 /*
  * Mark the prot value as uncacheable and unbufferable.

diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h
@@ -113,7 +113,6 @@ static inline int pte_dirty(pte_t pte)		\
 	{ return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte)		\
 	{ return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte)	{ return 0; }
 
 #define pgprot_noncached pgprot_noncached
 
@@ -168,8 +167,6 @@ static inline pte_t pte_mkdirty(pte_t pte)
 	return pte;
 }
 
-static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
-
 static inline pte_t pte_mkyoung(pte_t pte)
 {
 	pte_val(pte) |= _PAGE_ACCESSED;

diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h
@@ -236,8 +236,6 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
 static inline int pte_exec(pte_t pte)  { return pte_val(pte) & _PAGE_EXEC; }
 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return 0; }
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 
 static inline pte_t pte_wrprotect(pte_t pte)
 {

diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
@@ -377,15 +377,13 @@ static inline void pud_clear(pud_t *pud) {
 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
 static inline int pte_write(pte_t pte)		{ return pte_val(pte) & _PAGE_WRITE; }
-static inline int pte_special(pte_t pte)	{ return 0; }
 
 static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~_PAGE_WRITE; return pte; }
 static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
 static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) |= _PAGE_WRITE; return pte; }
-static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
 
 /*
  * Huge pte definitions.

diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
@@ -223,11 +223,6 @@ static inline int pte_young(pte_t pte)
 	return pte_val(pte) & SRMMU_REF;
 }
 
-static inline int pte_special(pte_t pte)
-{
-	return 0;
-}
-
 static inline pte_t pte_wrprotect(pte_t pte)
 {
 	return __pte(pte_val(pte) & ~SRMMU_WRITE);
@@ -258,8 +253,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
 	return __pte(pte_val(pte) | SRMMU_REF);
 }
 
-#define pte_mkspecial(pte)    (pte)
-
 #define pfn_pte(pfn, prot)		mk_pte(pfn_to_page(pfn), prot)
 
 static inline unsigned long pte_pfn(pte_t pte)

diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
@@ -167,11 +167,6 @@ static inline int pte_newprot(pte_t pte)
 	return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
 }
 
-static inline int pte_special(pte_t pte)
-{
-	return 0;
-}
-
 /*
  * =================================
  * Flags setting section.
@@ -247,11 +242,6 @@ static inline pte_t pte_mknewpage(pte_t pte)
 	return(pte);
 }
 
-static inline pte_t pte_mkspecial(pte_t pte)
-{
-	return(pte);
-}
-
 static inline void set_pte(pte_t *pteptr, pte_t pteval)
 {
 	pte_copy(*pteptr, pteval);

diff --git a/arch/unicore32/include/asm/pgtable.h b/arch/unicore32/include/asm/pgtable.h
@@ -177,7 +177,6 @@ extern struct page *empty_zero_page;
 #define pte_dirty(pte)		(pte_val(pte) & PTE_DIRTY)
 #define pte_young(pte)		(pte_val(pte) & PTE_YOUNG)
 #define pte_exec(pte)		(pte_val(pte) & PTE_EXEC)
-#define pte_special(pte)	(0)
 
 #define PTE_BIT_FUNC(fn, op) \
 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
@@ -189,8 +188,6 @@ PTE_BIT_FUNC(mkdirty,   |= PTE_DIRTY);
 PTE_BIT_FUNC(mkold,     &= ~PTE_YOUNG);
 PTE_BIT_FUNC(mkyoung,   |= PTE_YOUNG);
 
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
-
 /*
  * Mark the prot value as uncacheable.
  */

diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
@@ -266,7 +266,6 @@ static inline void paging_init(void) { }
 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; }
 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return 0; }
 
 static inline pte_t pte_wrprotect(pte_t pte)	
 	{ pte_val(pte) &= ~(_PAGE_WRITABLE | _PAGE_HW_WRITE); return pte; }
@@ -280,8 +279,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
 	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 static inline pte_t pte_mkwrite(pte_t pte)
 	{ pte_val(pte) |= _PAGE_WRITABLE; return pte; }
-static inline pte_t pte_mkspecial(pte_t pte)
-	{ return pte; }
 
 #define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CA_MASK))
 

diff --git a/include/linux/mm.h b/include/linux/mm.h
@@ -1927,6 +1927,18 @@ static inline void sync_mm_rss(struct mm_struct *mm)
 }
 #endif
 
+#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
+static inline int pte_special(pte_t pte)
+{
+	return 0;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	return pte;
+}
+#endif
+
 #ifndef CONFIG_ARCH_HAS_PTE_DEVMAP
 static inline int pte_devmap(pte_t pte)
 {