The patch titled
Subject: ia64/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
has been added to the -mm tree. Its filename is
ia64-mm-enable-arch_has_vm_get_page_prot.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/ia64-mm-enable-arch_has_vm_get_page_prot.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/ia64-mm-enable-arch_has_vm_get_page_prot.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: ia64/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/1645425519-9034-29-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/ia64/Kconfig | 1
arch/ia64/include/asm/pgtable.h | 17 ------------
arch/ia64/mm/init.c | 41 +++++++++++++++++++++++++++++-
3 files changed, 41 insertions(+), 18 deletions(-)
--- a/arch/ia64/include/asm/pgtable.h~ia64-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/ia64/include/asm/pgtable.h
@@ -161,23 +161,6 @@
* attempts to write to the page.
*/
/* xwr */
-#define __P000 PAGE_NONE
-#define __P001 PAGE_READONLY
-#define __P010 PAGE_READONLY /* write to priv pg -> copy & make writable */
-#define __P011 PAGE_READONLY /* ditto */
-#define __P100 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX)
-#define __P101 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX)
-#define __P110 PAGE_COPY_EXEC
-#define __P111 PAGE_COPY_EXEC
-
-#define __S000 PAGE_NONE
-#define __S001 PAGE_READONLY
-#define __S010 PAGE_SHARED /* we don't have (and don't need) write-only */
-#define __S011 PAGE_SHARED
-#define __S100 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX)
-#define __S101 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX)
-#define __S110 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX)
-#define __S111 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX)
#define pgd_ERROR(e) printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
#if CONFIG_PGTABLE_LEVELS == 4
--- a/arch/ia64/Kconfig~ia64-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/ia64/Kconfig
@@ -11,6 +11,7 @@ config IA64
select ARCH_HAS_DMA_MARK_CLEAN
select ARCH_HAS_STRNCPY_FROM_USER
select ARCH_HAS_STRNLEN_USER
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
select ACPI
--- a/arch/ia64/mm/init.c~ia64-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/ia64/mm/init.c
@@ -273,7 +273,7 @@ static int __init gate_vma_init(void)
gate_vma.vm_start = FIXADDR_USER_START;
gate_vma.vm_end = FIXADDR_USER_END;
gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
- gate_vma.vm_page_prot = __P101;
+ gate_vma.vm_page_prot = __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX);
return 0;
}
@@ -492,3 +492,42 @@ void arch_remove_memory(u64 start, u64 s
__remove_pages(start_pfn, nr_pages, altmap);
}
#endif
+
+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:
+ /* write to priv pg -> copy & make writable */
+ case VM_WRITE:
+ /* write to priv pg -> copy & make writable */
+ case VM_WRITE | VM_READ:
+ return PAGE_READONLY;
+ case VM_EXEC:
+ return __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX);
+ case VM_EXEC | VM_READ:
+ return __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX);
+ case VM_EXEC | VM_WRITE:
+ case VM_EXEC | VM_WRITE | VM_READ:
+ return PAGE_COPY_EXEC;
+ case VM_SHARED:
+ return PAGE_NONE;
+ case VM_SHARED | VM_READ:
+ return PAGE_READONLY;
+ /* we don't have (and don't need) write-only */
+ case VM_SHARED | VM_WRITE:
+ case VM_SHARED | VM_WRITE | VM_READ:
+ return PAGE_SHARED;
+ case VM_SHARED | VM_EXEC:
+ return __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX);
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX);
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+ return __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX);
+ 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
