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Subject[RFC V1 19/31] csky/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
Date
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 <geert@linux-m68k.org>
Cc: linux-csky@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/csky/Kconfig | 1 +
arch/csky/include/asm/pgtable.h | 18 ---------------
arch/csky/mm/init.c | 41 +++++++++++++++++++++++++++++++++
3 files changed, 42 insertions(+), 18 deletions(-)

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 132f43f12dd8..209dac5686dd 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 151607ed5158..2c6b1cfb1cce 100644
--- a/arch/csky/include/asm/pgtable.h
+++ b/arch/csky/include/asm/pgtable.h
@@ -76,24 +76,6 @@
#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..55952d8f8abc 100644
--- a/arch/csky/mm/init.c
+++ b/arch/csky/mm/init.c
@@ -197,3 +197,44 @@ 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:
+ return PAGE_READ;
+ case VM_WRITE:
+ return PAGE_READ;
+ case VM_READ | VM_WRITE:
+ return PAGE_READ;
+ case VM_EXEC:
+ return PAGE_READ;
+ case VM_EXEC | VM_READ:
+ return PAGE_READ;
+ case VM_EXEC | VM_WRITE:
+ return PAGE_READ;
+ case VM_EXEC | VM_READ | VM_WRITE:
+ return PAGE_READ;
+ case VM_SHARED:
+ return PAGE_NONE;
+ case VM_SHARED | VM_READ:
+ return PAGE_READ;
+ case VM_SHARED | VM_WRITE:
+ return PAGE_WRITE;
+ case VM_SHARED | VM_READ | VM_WRITE:
+ return PAGE_WRITE;
+ case VM_SHARED | VM_EXEC:
+ return PAGE_READ;
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return PAGE_READ;
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ return PAGE_WRITE;
+ case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
+ return PAGE_WRITE;
+ default:
+ BUILD_BUG();
+ }
+}
+EXPORT_SYMBOL(vm_get_page_prot);
--
2.25.1
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