nds32: use pgtable-nopmd instead of 4level-fixup

nds32 has only two-level page tables and can use pgtable-nopmd and
folding of the upper layers.

Replace usage of include/asm-generic/4level-fixup.h and explicit
definition of __PAGETABLE_PMD_FOLDED in nds32 with
include/asm-generic/pgtable-nopmd.h and adjust page table manipulation
macros and functions accordingly.

Link: http://lkml.kernel.org/r/1572938135-31886-8-git-send-email-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Anatoly Pugachev <matorola@gmail.com>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Peter Rosin <peda@axentia.se>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rolf Eike Beer <eike-kernel@sf-tec.de>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Sam Creasey <sammy@sammy.net>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/nds32/include/asm/page.h b/arch/nds32/include/asm/page.h
index 8feb1fa..86b3201 100644 (file)
--- a/arch/nds32/include/asm/page.h
+++ b/arch/nds32/include/asm/page.h
@@ -41,17 +41,14 @@ void clear_page(void *page);
 void copy_page(void *to, void *from);
 
 typedef unsigned long pte_t;
-typedef unsigned long pmd_t;
 typedef unsigned long pgd_t;
 typedef unsigned long pgprot_t;
 
 #define pte_val(x)      (x)
-#define pmd_val(x)      (x)
 #define pgd_val(x)     (x)
 #define pgprot_val(x)   (x)
 
 #define __pte(x)        (x)
-#define __pmd(x)        (x)
 #define __pgd(x)        (x)
 #define __pgprot(x)     (x)
 

diff --git a/arch/nds32/include/asm/pgalloc.h b/arch/nds32/include/asm/pgalloc.h
index 37125e6..85c1173 100644 (file)
--- a/arch/nds32/include/asm/pgalloc.h
+++ b/arch/nds32/include/asm/pgalloc.h
@@ -15,9 +15,6 @@
 /*
  * Since we have only two-level page tables, these are trivial
  */
-#define pmd_alloc_one(mm, addr)                ({ BUG(); ((pmd_t *)2); })
-#define pmd_free(mm, pmd)                      do { } while (0)
-#define pgd_populate(mm, pmd, pte)     BUG()
 #define pmd_pgtable(pmd) pmd_page(pmd)
 
 extern pgd_t *pgd_alloc(struct mm_struct *mm);

diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
index 6fbf251..0214e41 100644 (file)
--- a/arch/nds32/include/asm/pgtable.h
+++ b/arch/nds32/include/asm/pgtable.h
@@ -4,8 +4,7 @@
 #ifndef _ASMNDS32_PGTABLE_H
 #define _ASMNDS32_PGTABLE_H
 
-#define __PAGETABLE_PMD_FOLDED 1
-#include <asm-generic/4level-fixup.h>
+#include <asm-generic/pgtable-nopmd.h>
 #include <linux/sizes.h>
 
 #include <asm/memory.h>
@@ -18,26 +17,20 @@
 #ifdef CONFIG_ANDES_PAGE_SIZE_4KB
 #define PGDIR_SHIFT      22
 #define PTRS_PER_PGD     1024
-#define PMD_SHIFT        22
-#define PTRS_PER_PMD     1
 #define PTRS_PER_PTE     1024
 #endif
 
 #ifdef CONFIG_ANDES_PAGE_SIZE_8KB
 #define PGDIR_SHIFT      24
 #define PTRS_PER_PGD     256
-#define PMD_SHIFT        24
-#define PTRS_PER_PMD     1
 #define PTRS_PER_PTE     2048
 #endif
 
 #ifndef __ASSEMBLY__
 extern void __pte_error(const char *file, int line, unsigned long val);
-extern void __pmd_error(const char *file, int line, unsigned long val);
 extern void __pgd_error(const char *file, int line, unsigned long val);
 
 #define pte_ERROR(pte)         __pte_error(__FILE__, __LINE__, pte_val(pte))
-#define pmd_ERROR(pmd)         __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
 #define pgd_ERROR(pgd)         __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
 #endif /* !__ASSEMBLY__ */
 
@@ -368,9 +361,6 @@ static inline pmd_t __mk_pmd(pte_t * ptep, unsigned long prot)
 /* to find an entry in a kernel page-table-directory */
 #define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
 
-/* Find an entry in the second-level page table.. */
-#define pmd_offset(dir, addr)  ((pmd_t *)(dir))
-
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
        const unsigned long mask = 0xfff;

diff --git a/arch/nds32/include/asm/tlb.h b/arch/nds32/include/asm/tlb.h
index a8aff1c..6726038 100644 (file)
--- a/arch/nds32/include/asm/tlb.h
+++ b/arch/nds32/include/asm/tlb.h
@@ -7,6 +7,5 @@
 #include <asm-generic/tlb.h>
 
 #define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
-#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tln)->mm, pmd)
 
 #endif

diff --git a/arch/nds32/kernel/pm.c b/arch/nds32/kernel/pm.c
index ffa8040..e25700e 100644 (file)
--- a/arch/nds32/kernel/pm.c
+++ b/arch/nds32/kernel/pm.c
@@ -14,6 +14,7 @@ unsigned int *phy_addr_sp_tmp;
 static void nds32_suspend2ram(void)
 {
        pgd_t *pgdv;
+       p4d_t *p4dv;
        pud_t *pudv;
        pmd_t *pmdv;
        pte_t *ptev;
@@ -21,7 +22,8 @@ static void nds32_suspend2ram(void)
        pgdv = (pgd_t *)__va((__nds32__mfsr(NDS32_SR_L1_PPTB) &
                L1_PPTB_mskBASE)) + pgd_index((unsigned int)cpu_resume);
 
-       pudv = pud_offset(pgdv, (unsigned int)cpu_resume);
+       p4dv = p4d_offset(pgdv, (unsigned int)cpu_resume);
+       pudv = pud_offset(p4dv, (unsigned int)cpu_resume);
        pmdv = pmd_offset(pudv, (unsigned int)cpu_resume);
        ptev = pte_offset_map(pmdv, (unsigned int)cpu_resume);
 

diff --git a/arch/nds32/mm/fault.c b/arch/nds32/mm/fault.c
index 064ae5d..906dfb2 100644 (file)
--- a/arch/nds32/mm/fault.c
+++ b/arch/nds32/mm/fault.c
@@ -31,6 +31,8 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
        pr_alert("[%08lx] *pgd=%08lx", addr, pgd_val(*pgd));
 
        do {
+               p4d_t *p4d;
+               pud_t *pud;
                pmd_t *pmd;
 
                if (pgd_none(*pgd))
@@ -41,7 +43,9 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
                        break;
                }
 
-               pmd = pmd_offset(pgd, addr);
+               p4d = p4d_offset(pgd, addr);
+               pud = pud_offset(p4d, addr);
+               pmd = pmd_offset(pud, addr);
 #if PTRS_PER_PMD != 1
                pr_alert(", *pmd=%08lx", pmd_val(*pmd));
 #endif
@@ -359,6 +363,7 @@ vmalloc_fault:
 
                unsigned int index = pgd_index(addr);
                pgd_t *pgd, *pgd_k;
+               p4d_t *p4d, *p4d_k;
                pud_t *pud, *pud_k;
                pmd_t *pmd, *pmd_k;
                pte_t *pte_k;
@@ -369,8 +374,13 @@ vmalloc_fault:
                if (!pgd_present(*pgd_k))
                        goto no_context;
 
-               pud = pud_offset(pgd, addr);
-               pud_k = pud_offset(pgd_k, addr);
+               p4d = p4d_offset(pgd, addr);
+               p4d_k = p4d_offset(pgd_k, addr);
+               if (!p4d_present(*p4d_k))
+                       goto no_context;
+
+               pud = pud_offset(p4d, addr);
+               pud_k = pud_offset(p4d_k, addr);
                if (!pud_present(*pud_k))
                        goto no_context;
 

diff --git a/arch/nds32/mm/init.c b/arch/nds32/mm/init.c
index 55703b0..0be3833 100644 (file)
--- a/arch/nds32/mm/init.c
+++ b/arch/nds32/mm/init.c
@@ -54,6 +54,7 @@ static void __init map_ram(void)
 {
        unsigned long v, p, e;
        pgd_t *pge;
+       p4d_t *p4e;
        pud_t *pue;
        pmd_t *pme;
        pte_t *pte;
@@ -69,7 +70,8 @@ static void __init map_ram(void)
 
        while (p < e) {
                int j;
-               pue = pud_offset(pge, v);
+               p4e = p4d_offset(pge, v);
+               pue = pud_offset(p4e, v);
                pme = pmd_offset(pue, v);
 
                if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
@@ -100,6 +102,7 @@ static void __init fixedrange_init(void)
 {
        unsigned long vaddr;
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
 #ifdef CONFIG_HIGHMEM
@@ -111,7 +114,8 @@ static void __init fixedrange_init(void)
         */
        vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
        pgd = swapper_pg_dir + pgd_index(vaddr);
-       pud = pud_offset(pgd, vaddr);
+       p4d = p4d_offset(pgd, vaddr);
+       pud = pud_offset(p4d, vaddr);
        pmd = pmd_offset(pud, vaddr);
        fixmap_pmd_p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
        if (!fixmap_pmd_p)
@@ -126,7 +130,8 @@ static void __init fixedrange_init(void)
        vaddr = PKMAP_BASE;
 
        pgd = swapper_pg_dir + pgd_index(vaddr);
-       pud = pud_offset(pgd, vaddr);
+       p4d = p4d_offset(pgd, vaddr);
+       pud = pud_offset(p4d, vaddr);
        pmd = pmd_offset(pud, vaddr);
        pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
        if (!pte)

diff --git a/arch/nds32/mm/mm-nds32.c b/arch/nds32/mm/mm-nds32.c
index 3b43798..8503bee 100644 (file)
--- a/arch/nds32/mm/mm-nds32.c
+++ b/arch/nds32/mm/mm-nds32.c
@@ -74,6 +74,8 @@ void setup_mm_for_reboot(char mode)
 {
        unsigned long pmdval;
        pgd_t *pgd;
+       p4d_t *p4d;
+       pud_t *pud;
        pmd_t *pmd;
        int i;
 
@@ -84,7 +86,9 @@ void setup_mm_for_reboot(char mode)
 
        for (i = 0; i < USER_PTRS_PER_PGD; i++) {
                pmdval = (i << PGDIR_SHIFT);
-               pmd = pmd_offset(pgd + i, i << PGDIR_SHIFT);
+               p4d = p4d_offset(pgd, i << PGDIR_SHIFT);
+               pud = pud_offset(p4d, i << PGDIR_SHIFT);
+               pmd = pmd_offset(pud + i, i << PGDIR_SHIFT);
                set_pmd(pmd, __pmd(pmdval));
        }
 }

diff --git a/arch/nds32/mm/proc.c b/arch/nds32/mm/proc.c
index ba80992..837ae77 100644 (file)
--- a/arch/nds32/mm/proc.c
+++ b/arch/nds32/mm/proc.c
@@ -16,10 +16,14 @@ extern struct cache_info L1_cache_info[2];
 
 int va_kernel_present(unsigned long addr)
 {
+       p4d_t *p4d;
+       pud_t *pud;
        pmd_t *pmd;
        pte_t *ptep, pte;
 
-       pmd = pmd_offset(pgd_offset_k(addr), addr);
+       p4d = p4d_offset(pgd_offset_k(addr), addr);
+       pud = pud_offset(p4d, addr);
+       pmd = pmd_offset(pud, addr);
        if (!pmd_none(*pmd)) {
                ptep = pte_offset_map(pmd, addr);
                pte = *ptep;
@@ -32,20 +36,24 @@ int va_kernel_present(unsigned long addr)
 pte_t va_present(struct mm_struct * mm, unsigned long addr)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *ptep, pte;
 
        pgd = pgd_offset(mm, addr);
        if (!pgd_none(*pgd)) {
-               pud = pud_offset(pgd, addr);
-               if (!pud_none(*pud)) {
-                       pmd = pmd_offset(pud, addr);
-                       if (!pmd_none(*pmd)) {
-                               ptep = pte_offset_map(pmd, addr);
-                               pte = *ptep;
-                               if (pte_present(pte))
-                                       return pte;
+               p4d = p4d_offset(pgd, addr);
+               if (!p4d_none(*p4d)) {
+                       pud = pud_offset(p4d, addr);
+                       if (!pud_none(*pud)) {
+                               pmd = pmd_offset(pud, addr);
+                               if (!pmd_none(*pmd)) {
+                                       ptep = pte_offset_map(pmd, addr);
+                                       pte = *ptep;
+                                       if (pte_present(pte))
+                                               return pte;
+                               }
                        }
                }
        }