+ parisc-mm-enable-arch_has_vm_get_page_prot.patch added to mm-unstable branch

+ parisc-mm-enable-arch_has_vm_get_page_prot.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: parisc/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
has been added to the -mm mm-unstable branch.  Its filename is
     parisc-mm-enable-arch_has_vm_get_page_prot.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/parisc-mm-enable-arch_has_vm_get_page_prot.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@arm.com>
Subject: parisc/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
Date: Thu, 30 Jun 2022 10:46:17 +0530

This enables ARCH_HAS_VM_GET_PAGE_PROT on the platform and exports
standard vm_get_page_prot() implementation via DECLARE_VM_GET_PAGE_PROT,
which looks up a private and static protection_map[] array.  Subsequently
all __SXXX and __PXXX macros can be dropped which are no longer needed.

Link: https://lkml.kernel.org/r/20220630051630.1718927-14-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/parisc/Kconfig               |    1 +
 arch/parisc/include/asm/pgtable.h |   18 ------------------
 arch/parisc/mm/init.c             |   20 ++++++++++++++++++++
 3 files changed, 21 insertions(+), 18 deletions(-)

--- a/arch/parisc/include/asm/pgtable.h~parisc-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/parisc/include/asm/pgtable.h
@@ -271,24 +271,6 @@ extern void __update_cache(pte_t pte);
  */
 
 	 /*xwr*/
-#define __P000  PAGE_NONE
-#define __P001  PAGE_READONLY
-#define __P010  __P000 /* copy on write */
-#define __P011  __P001 /* copy on write */
-#define __P100  PAGE_EXECREAD
-#define __P101  PAGE_EXECREAD
-#define __P110  __P100 /* copy on write */
-#define __P111  __P101 /* copy on write */
-
-#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
-
 
 extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */
 
--- a/arch/parisc/Kconfig~parisc-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/parisc/Kconfig
@@ -12,6 +12,7 @@ config PARISC
 	select ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_HAS_STRICT_MODULE_RWX
 	select ARCH_HAS_UBSAN_SANITIZE_ALL
+	select ARCH_HAS_VM_GET_PAGE_PROT
 	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_NO_SG_CHAIN
 	select ARCH_SUPPORTS_HUGETLBFS if PA20
--- a/arch/parisc/mm/init.c~parisc-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/parisc/mm/init.c
@@ -871,3 +871,23 @@ void flush_tlb_all(void)
 	spin_unlock(&sid_lock);
 }
 #endif
+
+static const pgprot_t protection_map[16] = {
+	[VM_NONE]					= PAGE_NONE,
+	[VM_READ]					= PAGE_READONLY,
+	[VM_WRITE]					= PAGE_NONE,
+	[VM_WRITE | VM_READ]				= PAGE_READONLY,
+	[VM_EXEC]					= PAGE_EXECREAD,
+	[VM_EXEC | VM_READ]				= PAGE_EXECREAD,
+	[VM_EXEC | VM_WRITE]				= PAGE_EXECREAD,
+	[VM_EXEC | VM_WRITE | VM_READ]			= PAGE_EXECREAD,
+	[VM_SHARED]					= PAGE_NONE,
+	[VM_SHARED | VM_READ]				= PAGE_READONLY,
+	[VM_SHARED | VM_WRITE]				= PAGE_WRITEONLY,
+	[VM_SHARED | VM_WRITE | VM_READ]		= PAGE_SHARED,
+	[VM_SHARED | VM_EXEC]				= PAGE_EXECREAD,
+	[VM_SHARED | VM_EXEC | VM_READ]			= PAGE_EXECREAD,
+	[VM_SHARED | VM_EXEC | VM_WRITE]		= PAGE_RWX,
+	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= PAGE_RWX
+};
+DECLARE_VM_GET_PAGE_PROT
_

Patches currently in -mm which might be from anshuman.khandual@arm.com are

mm-mmap-build-protect-protection_map-with-__p000.patch
mm-mmap-define-declare_vm_get_page_prot.patch
powerpc-mm-move-protection_map-inside-the-platform.patch
sparc-mm-move-protection_map-inside-the-platform.patch
arm64-mm-move-protection_map-inside-the-platform.patch
x86-mm-move-protection_map-inside-the-platform.patch
mm-mmap-build-protect-protection_map-with-arch_has_vm_get_page_prot.patch
microblaze-mm-enable-arch_has_vm_get_page_prot.patch
loongarch-mm-enable-arch_has_vm_get_page_prot.patch
openrisc-mm-enable-arch_has_vm_get_page_prot.patch
xtensa-mm-enable-arch_has_vm_get_page_prot.patch
hexagon-mm-enable-arch_has_vm_get_page_prot.patch
parisc-mm-enable-arch_has_vm_get_page_prot.patch
alpha-mm-enable-arch_has_vm_get_page_prot.patch
nios2-mm-enable-arch_has_vm_get_page_prot.patch
riscv-mm-enable-arch_has_vm_get_page_prot.patch
csky-mm-enable-arch_has_vm_get_page_prot.patch
s390-mm-enable-arch_has_vm_get_page_prot.patch
ia64-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
arc-mm-enable-arch_has_vm_get_page_prot.patch
arm-mm-enable-arch_has_vm_get_page_prot.patch
um-mm-enable-arch_has_vm_get_page_prot.patch
sh-mm-enable-arch_has_vm_get_page_prot.patch
mm-mmap-drop-arch_has_vm_get_page_prot.patch