The patch titled
Subject: nios2/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
has been added to the -mm tree. Its filename is
nios2-mm-enable-arch_has_vm_get_page_prot.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/nios2-mm-enable-arch_has_vm_get_page_prot.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/nios2-mm-enable-arch_has_vm_get_page_prot.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: nios2/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
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.
Link: https://lkml.kernel.org/r/1645425519-9034-26-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Acked-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/nios2/Kconfig | 1
arch/nios2/include/asm/pgtable.h | 16 ----------
arch/nios2/mm/init.c | 45 +++++++++++++++++++++++++++++
3 files changed, 46 insertions(+), 16 deletions(-)
--- a/arch/nios2/include/asm/pgtable.h~nios2-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/nios2/include/asm/pgtable.h
@@ -40,24 +40,8 @@ struct mm_struct;
*/
/* Remove W bit on private pages for COW support */
-#define __P000 MKP(0, 0, 0)
-#define __P001 MKP(0, 0, 1)
-#define __P010 MKP(0, 0, 0) /* COW */
-#define __P011 MKP(0, 0, 1) /* COW */
-#define __P100 MKP(1, 0, 0)
-#define __P101 MKP(1, 0, 1)
-#define __P110 MKP(1, 0, 0) /* COW */
-#define __P111 MKP(1, 0, 1) /* COW */
/* Shared pages can have exact HW mapping */
-#define __S000 MKP(0, 0, 0)
-#define __S001 MKP(0, 0, 1)
-#define __S010 MKP(0, 1, 0)
-#define __S011 MKP(0, 1, 1)
-#define __S100 MKP(1, 0, 0)
-#define __S101 MKP(1, 0, 1)
-#define __S110 MKP(1, 1, 0)
-#define __S111 MKP(1, 1, 1)
/* Used all over the kernel */
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
--- a/arch/nios2/Kconfig~nios2-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/nios2/Kconfig
@@ -6,6 +6,7 @@ config NIOS2
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_HAS_DMA_SET_UNCACHED
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_NO_SWAP
select COMMON_CLK
select TIMER_OF
--- a/arch/nios2/mm/init.c~nios2-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/nios2/mm/init.c
@@ -124,3 +124,48 @@ const char *arch_vma_name(struct vm_area
{
return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
}
+
+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 MKP(0, 0, 0);
+ case VM_READ:
+ return MKP(0, 0, 1);
+ /* COW */
+ case VM_WRITE:
+ return MKP(0, 0, 0);
+ /* COW */
+ case VM_WRITE | VM_READ:
+ return MKP(0, 0, 1);
+ case VM_EXEC:
+ return MKP(1, 0, 0);
+ case VM_EXEC | VM_READ:
+ return MKP(1, 0, 1);
+ /* COW */
+ case VM_EXEC | VM_WRITE:
+ return MKP(1, 0, 0);
+ /* COW */
+ case VM_EXEC | VM_WRITE | VM_READ:
+ return MKP(1, 0, 1);
+ case VM_SHARED:
+ return MKP(0, 0, 0);
+ case VM_SHARED | VM_READ:
+ return MKP(0, 0, 1);
+ case VM_SHARED | VM_WRITE:
+ return MKP(0, 1, 0);
+ case VM_SHARED | VM_WRITE | VM_READ:
+ return MKP(0, 1, 1);
+ case VM_SHARED | VM_EXEC:
+ return MKP(1, 0, 0);
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return MKP(1, 0, 1);
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ return MKP(1, 1, 0);
+ case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+ return MKP(1, 1, 1);
+ default:
+ BUILD_BUG();
+ }
+}
+EXPORT_SYMBOL(vm_get_page_prot);
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-generalize-arch_has_filter_pgprot.patch
mm-merge-pte_mkhuge-call-into-arch_make_huge_pte.patch
mm-debug_vm_pgtable-drop-protection_map-usage.patch
mm-mmap-clarify-protection_map-indices.patch
mm-mmap-add-new-config-arch_has_vm_get_page_prot.patch
powerpc-mm-enable-arch_has_vm_get_page_prot.patch
arm64-mm-enable-arch_has_vm_get_page_prot.patch
sparc-mm-enable-arch_has_vm_get_page_prot.patch
mips-mm-enable-arch_has_vm_get_page_prot.patch
m68k-mm-enable-arch_has_vm_get_page_prot.patch
arm-mm-enable-arch_has_vm_get_page_prot.patch
mm-mmap-drop-protection_map.patch
mm-mmap-drop-arch_filter_pgprot.patch
mm-mmap-drop-arch_vm_get_page_pgprot.patch
s390-mm-enable-arch_has_vm_get_page_prot.patch
riscv-mm-enable-arch_has_vm_get_page_prot.patch
alpha-mm-enable-arch_has_vm_get_page_prot.patch
sh-mm-enable-arch_has_vm_get_page_prot.patch
arc-mm-enable-arch_has_vm_get_page_prot.patch
csky-mm-enable-arch_has_vm_get_page_prot.patch
extensa-mm-enable-arch_has_vm_get_page_prot.patch
parisc-mm-enable-arch_has_vm_get_page_prot.patch
openrisc-mm-enable-arch_has_vm_get_page_prot.patch
um-mm-enable-arch_has_vm_get_page_prot.patch
microblaze-mm-enable-arch_has_vm_get_page_prot.patch
nios2-mm-enable-arch_has_vm_get_page_prot.patch
hexagon-mm-enable-arch_has_vm_get_page_prot.patch
nds32-mm-enable-arch_has_vm_get_page_prot.patch
ia64-mm-enable-arch_has_vm_get_page_prot.patch
mm-mmap-drop-generic-vm_get_page_prot.patch
mm-mmap-drop-arch_has_vm_get_page_prot.patch
mm-hugetlb-generalize-arch_want_general_hugetlb.patch
mm-migration-add-trace-events-for-thp-migrations.patch
mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations.patch
