[PATCH V3 16/30] alpha/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

Anshuman Khandual
2022-02-28T10:59:39Z

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: Richard Henderson <rth@twiddle.net>
Cc: linux-alpha@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/alpha/Kconfig | 1 +
arch/alpha/include/asm/pgtable.h | 17 ---------------
arch/alpha/mm/init.c | 37 ++++++++++++++++++++++++++++++++
3 files changed, 38 insertions(+), 17 deletions(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 4e87783c90ad..73e82fe5c770 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -2,6 +2,7 @@
config ALPHA
bool
default y
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_32BIT_USTAT_F_TINODE
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index 02f0429f1068..9fb5e9d10bb6 100644
--- a/arch/alpha/include/asm/pgtable.h
+++ b/arch/alpha/include/asm/pgtable.h
@@ -116,23 +116,6 @@ struct vm_area_struct;
* arch/alpha/mm/fault.c)
*/
/* xwr */
-#define __P000 _PAGE_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
-#define __P001 _PAGE_P(_PAGE_FOE | _PAGE_FOW)
-#define __P010 _PAGE_P(_PAGE_FOE)
-#define __P011 _PAGE_P(_PAGE_FOE)
-#define __P100 _PAGE_P(_PAGE_FOW | _PAGE_FOR)
-#define __P101 _PAGE_P(_PAGE_FOW)
-#define __P110 _PAGE_P(0)
-#define __P111 _PAGE_P(0)
-
-#define __S000 _PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
-#define __S001 _PAGE_S(_PAGE_FOE | _PAGE_FOW)
-#define __S010 _PAGE_S(_PAGE_FOE)
-#define __S011 _PAGE_S(_PAGE_FOE)
-#define __S100 _PAGE_S(_PAGE_FOW | _PAGE_FOR)
-#define __S101 _PAGE_S(_PAGE_FOW)
-#define __S110 _PAGE_S(0)
-#define __S111 _PAGE_S(0)

/*
* pgprot_noncached() is only for infiniband pci support, and a real
diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
index f6114d03357c..2e78008b2553 100644
--- a/arch/alpha/mm/init.c
+++ b/arch/alpha/mm/init.c
@@ -280,3 +280,40 @@ mem_init(void)
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
memblock_free_all();
}
+
+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_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR);
+ case VM_READ:
+ return _PAGE_P(_PAGE_FOE | _PAGE_FOW);
+ case VM_WRITE:
+ case VM_WRITE | VM_READ:
+ return _PAGE_P(_PAGE_FOE);
+ case VM_EXEC:
+ return _PAGE_P(_PAGE_FOW | _PAGE_FOR);
+ case VM_EXEC | VM_READ:
+ return _PAGE_P(_PAGE_FOW);
+ case VM_EXEC | VM_WRITE:
+ case VM_EXEC | VM_WRITE | VM_READ:
+ return _PAGE_P(0);
+ case VM_SHARED:
+ return _PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR);
+ case VM_SHARED | VM_READ:
+ return _PAGE_S(_PAGE_FOE | _PAGE_FOW);
+ case VM_SHARED | VM_WRITE:
+ case VM_SHARED | VM_WRITE | VM_READ:
+ return _PAGE_S(_PAGE_FOE);
+ case VM_SHARED | VM_EXEC:
+ return _PAGE_S(_PAGE_FOW | _PAGE_FOR);
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return _PAGE_S(_PAGE_FOW);
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+ return _PAGE_S(0);
+ default:
+ BUILD_BUG();
+ }
+}
+EXPORT_SYMBOL(vm_get_page_prot);
--
2.25.1