The patch titled
Subject: arc/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
has been added to the -mm tree. Its filename is
arc-mm-enable-arch_has_vm_get_page_prot.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/arc-mm-enable-arch_has_vm_get_page_prot.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/arc-mm-enable-arch_has_vm_get_page_prot.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: arc/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/1645425519-9034-19-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Vineet Gupta <vgupta@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arc/Kconfig | 1
arch/arc/include/asm/pgtable-bits-arcv2.h | 17 --------
arch/arc/mm/mmap.c | 41 ++++++++++++++++++++
3 files changed, 42 insertions(+), 17 deletions(-)
--- a/arch/arc/include/asm/pgtable-bits-arcv2.h~arc-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arc/include/asm/pgtable-bits-arcv2.h
@@ -72,23 +72,6 @@
* This is to enable COW mechanism
*/
/* xwr */
-#define __P000 PAGE_U_NONE
-#define __P001 PAGE_U_R
-#define __P010 PAGE_U_R /* Pvt-W => !W */
-#define __P011 PAGE_U_R /* Pvt-W => !W */
-#define __P100 PAGE_U_X_R /* X => R */
-#define __P101 PAGE_U_X_R
-#define __P110 PAGE_U_X_R /* Pvt-W => !W and X => R */
-#define __P111 PAGE_U_X_R /* Pvt-W => !W */
-
-#define __S000 PAGE_U_NONE
-#define __S001 PAGE_U_R
-#define __S010 PAGE_U_W_R /* W => R */
-#define __S011 PAGE_U_W_R
-#define __S100 PAGE_U_X_R /* X => R */
-#define __S101 PAGE_U_X_R
-#define __S110 PAGE_U_X_W_R /* X => R */
-#define __S111 PAGE_U_X_W_R
#ifndef __ASSEMBLY__
--- a/arch/arc/Kconfig~arc-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arc/Kconfig
@@ -13,6 +13,7 @@ config ARC
select ARCH_HAS_SETUP_DMA_OPS
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
select ARCH_32BIT_OFF_T
select BUILDTIME_TABLE_SORT
--- a/arch/arc/mm/mmap.c~arc-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arc/mm/mmap.c
@@ -74,3 +74,44 @@ arch_get_unmapped_area(struct file *filp
info.align_offset = pgoff << PAGE_SHIFT;
return vm_unmapped_area(&info);
}
+
+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_U_NONE;
+ case VM_READ:
+ /* Pvt-W => !W */
+ case VM_WRITE:
+ /* Pvt-W => !W */
+ case VM_WRITE | VM_READ:
+ return PAGE_U_R;
+ /* X => R */
+ case VM_EXEC:
+ case VM_EXEC | VM_READ:
+ /* Pvt-W => !W and X => R */
+ case VM_EXEC | VM_WRITE:
+ /* Pvt-W => !W */
+ case VM_EXEC | VM_WRITE | VM_READ:
+ return PAGE_U_X_R;
+ case VM_SHARED:
+ return PAGE_U_NONE;
+ case VM_SHARED | VM_READ:
+ return PAGE_U_R;
+ /* W => R */
+ case VM_SHARED | VM_WRITE:
+ case VM_SHARED | VM_WRITE | VM_READ:
+ return PAGE_U_W_R;
+ /* X => R */
+ case VM_SHARED | VM_EXEC:
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return PAGE_U_X_R;
+ /* X => R */
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+ return PAGE_U_X_W_R;
+ 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
