[PATCH V3 28/30] ia64/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

Anshuman Khandual
2022-02-28T10:55:10Z

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: linux-ia64@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/ia64/Kconfig | 1 +
arch/ia64/include/asm/pgtable.h | 17 --------------
arch/ia64/mm/init.c | 41 ++++++++++++++++++++++++++++++++-
3 files changed, 41 insertions(+), 18 deletions(-)

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index a7e01573abd8..0ab15e8d5783 100644
--- a/arch/ia64/Kconfig
+++ b/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
diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h
index 9584b2c5f394..8154c78bba56 100644
--- a/arch/ia64/include/asm/pgtable.h
+++ b/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
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 5d165607bf35..2a922883e30f 100644
--- a/arch/ia64/mm/init.c
+++ b/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 size, struct vmem_altmap *altmap)
__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);
--
2.25.1