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Subject[RFC V1 17/31] sh/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: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/sh/Kconfig | 1 +
arch/sh/include/asm/pgtable.h | 17 --------------
arch/sh/mm/mmap.c | 43 +++++++++++++++++++++++++++++++++++
3 files changed, 44 insertions(+), 17 deletions(-)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 2474a04ceac4..f3fcd1c5e002 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -11,6 +11,7 @@ config SUPERH
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_HIBERNATION_POSSIBLE if MMU
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_WANT_IPC_PARSE_VERSION
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index d7ddb1ec86a0..6fb9ec54cf9b 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -89,23 +89,6 @@ static inline unsigned long phys_addr_mask(void)
* completely separate permission bits for user and kernel space.
*/
/*xwr*/
-#define __P000 PAGE_NONE
-#define __P001 PAGE_READONLY
-#define __P010 PAGE_COPY
-#define __P011 PAGE_COPY
-#define __P100 PAGE_EXECREAD
-#define __P101 PAGE_EXECREAD
-#define __P110 PAGE_COPY
-#define __P111 PAGE_COPY
-
-#define __S000 PAGE_NONE
-#define __S001 PAGE_READONLY
-#define __S010 PAGE_WRITEONLY
-#define __S011 PAGE_SHARED
-#define __S100 PAGE_EXECREAD
-#define __S101 PAGE_EXECREAD
-#define __S110 PAGE_RWX
-#define __S111 PAGE_RWX

typedef pte_t *pte_addr_t;

diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
index 6a1a1297baae..21b3fae77a4e 100644
--- a/arch/sh/mm/mmap.c
+++ b/arch/sh/mm/mmap.c
@@ -162,3 +162,46 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
{
return 1;
}
+
+#ifdef CONFIG_MMU
+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_READONLY;
+ case VM_WRITE:
+ return PAGE_COPY;
+ case VM_READ | VM_WRITE:
+ return PAGE_COPY;
+ case VM_EXEC:
+ return PAGE_EXECREAD;
+ case VM_EXEC | VM_READ:
+ return PAGE_EXECREAD;
+ case VM_EXEC | VM_WRITE:
+ return PAGE_COPY;
+ case VM_EXEC | VM_READ | VM_WRITE:
+ return PAGE_COPY;
+ case VM_SHARED:
+ return PAGE_COPY;
+ case VM_SHARED | VM_READ:
+ return PAGE_READONLY;
+ case VM_SHARED | VM_WRITE:
+ return PAGE_WRITEONLY;
+ case VM_SHARED | VM_READ | VM_WRITE:
+ return PAGE_SHARED;
+ case VM_SHARED | VM_EXEC:
+ return PAGE_EXECREAD;
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return PAGE_EXECREAD;
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ return PAGE_RWX;
+ case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
+ return PAGE_RWX;
+ default:
+ BUILD_BUG();
+ }
+}
+EXPORT_SYMBOL(vm_get_page_prot);
+#endif
--
2.25.1
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