[PATCH 4/6] csky/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

[Anshuman Khandual]

This defines and exports a platform specific custom vm_get_page_prot() via
subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX
macros can be dropped which are no longer needed.

Cc: Geert Uytterhoeven <ge...@linux-m68k.org>
Cc: linux-c...@vger.kernel.org
Cc: linux-ker...@vger.kernel.org
Acked-by: Guo Ren <guo...@kernel.org>
Signed-off-by: Anshuman Khandual <anshuman.khand...@arm.com>
---
 arch/csky/Kconfig               |  1 +
 arch/csky/include/asm/pgtable.h | 18 ------------------
 arch/csky/mm/init.c             | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 18 deletions(-)

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 21d72b078eef..588b8a9c68ed 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -6,6 +6,7 @@ config CSKY
        select ARCH_HAS_GCOV_PROFILE_ALL
        select ARCH_HAS_SYNC_DMA_FOR_CPU
        select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+       select ARCH_HAS_VM_GET_PAGE_PROT
        select ARCH_USE_BUILTIN_BSWAP
        select ARCH_USE_QUEUED_RWLOCKS
        select ARCH_WANT_FRAME_POINTERS if !CPU_CK610 && 
$(cc-option,-mbacktrace)
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index bbe245117777..229a5f4ad7fc 100644
--- a/arch/csky/include/asm/pgtable.h
+++ b/arch/csky/include/asm/pgtable.h
@@ -77,24 +77,6 @@
 #define MAX_SWAPFILES_CHECK() \
                BUILD_BUG_ON(MAX_SWAPFILES_SHIFT != 5)
 
-#define __P000 PAGE_NONE
-#define __P001 PAGE_READ
-#define __P010 PAGE_READ
-#define __P011 PAGE_READ
-#define __P100 PAGE_READ
-#define __P101 PAGE_READ
-#define __P110 PAGE_READ
-#define __P111 PAGE_READ
-
-#define __S000 PAGE_NONE
-#define __S001 PAGE_READ
-#define __S010 PAGE_WRITE
-#define __S011 PAGE_WRITE
-#define __S100 PAGE_READ
-#define __S101 PAGE_READ
-#define __S110 PAGE_WRITE
-#define __S111 PAGE_WRITE
-
 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 #define ZERO_PAGE(vaddr)       (virt_to_page(empty_zero_page))
 
diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
index bf2004aa811a..f9babbed17d4 100644
--- a/arch/csky/mm/init.c
+++ b/arch/csky/mm/init.c
@@ -197,3 +197,35 @@ void __init fixaddr_init(void)
        vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
        fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
 }
+
+pgprot_t vm_get_page_prot(unsigned long vm_flags)
+{
+       switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) {
+       case VM_NONE:
+               return PAGE_NONE;
+       case VM_READ:
+       case VM_WRITE:
+       case VM_WRITE | VM_READ:
+       case VM_EXEC:
+       case VM_EXEC | VM_READ:
+       case VM_EXEC | VM_WRITE:
+       case VM_EXEC | VM_WRITE | VM_READ:
+               return PAGE_READ;
+       case VM_SHARED:
+               return PAGE_NONE;
+       case VM_SHARED | VM_READ:
+               return PAGE_READ;
+       case VM_SHARED | VM_WRITE:
+       case VM_SHARED | VM_WRITE | VM_READ:
+               return PAGE_WRITE;
+       case VM_SHARED | VM_EXEC:
+       case VM_SHARED | VM_EXEC | VM_READ:
+               return PAGE_READ;
+       case VM_SHARED | VM_EXEC | VM_WRITE:
+       case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+               return PAGE_WRITE;
+       default:
+               BUILD_BUG();
+       }
+}
+EXPORT_SYMBOL(vm_get_page_prot);
-- 
2.25.1