diff mbox series

[V4,18/26] s390/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

Message ID 20220624044339.1533882-19-anshuman.khandual@arm.com (mailing list archive)
State Awaiting Upstream
Headers show
Series mm/mmap: Drop __SXXX/__PXXX macros from across platforms | expand

Commit Message

Anshuman Khandual June 24, 2022, 4:43 a.m. UTC 
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.

Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: linux-s390@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/s390/Kconfig               |  1 +
 arch/s390/include/asm/pgtable.h | 17 -----------------
 arch/s390/mm/mmap.c             | 20 ++++++++++++++++++++
 3 files changed, 21 insertions(+), 17 deletions(-)
diff mbox series

Patch

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 91c0b80a8bf0..c4481377ca83 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -81,6 +81,7 @@  config S390
 	select ARCH_HAS_SYSCALL_WRAPPER
 	select ARCH_HAS_UBSAN_SANITIZE_ALL
 	select ARCH_HAS_VDSO_DATA
+	select ARCH_HAS_VM_GET_PAGE_PROT
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select ARCH_INLINE_READ_LOCK
 	select ARCH_INLINE_READ_LOCK_BH
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index a397b072a580..c63a05b5368a 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -424,23 +424,6 @@  static inline int is_module_addr(void *addr)
  * implies read permission.
  */
          /*xwr*/
-#define __P000	PAGE_NONE
-#define __P001	PAGE_RO
-#define __P010	PAGE_RO
-#define __P011	PAGE_RO
-#define __P100	PAGE_RX
-#define __P101	PAGE_RX
-#define __P110	PAGE_RX
-#define __P111	PAGE_RX
-
-#define __S000	PAGE_NONE
-#define __S001	PAGE_RO
-#define __S010	PAGE_RW
-#define __S011	PAGE_RW
-#define __S100	PAGE_RX
-#define __S101	PAGE_RX
-#define __S110	PAGE_RWX
-#define __S111	PAGE_RWX
 
 /*
  * Segment entry (large page) protection definitions.
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index d545f5c39f7e..c745b545012b 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -188,3 +188,23 @@  void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
 		mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 	}
 }
+
+static pgprot_t protection_map[16] __ro_after_init = {
+	[VM_NONE]					= PAGE_NONE,
+	[VM_READ]					= PAGE_RO,
+	[VM_WRITE]					= PAGE_RO,
+	[VM_WRITE | VM_READ]				= PAGE_RO,
+	[VM_EXEC]					= PAGE_RX,
+	[VM_EXEC | VM_READ]				= PAGE_RX,
+	[VM_EXEC | VM_WRITE]				= PAGE_RX,
+	[VM_EXEC | VM_WRITE | VM_READ]			= PAGE_RX,
+	[VM_SHARED]					= PAGE_NONE,
+	[VM_SHARED | VM_READ]				= PAGE_RO,
+	[VM_SHARED | VM_WRITE]				= PAGE_RW,
+	[VM_SHARED | VM_WRITE | VM_READ]		= PAGE_RW,
+	[VM_SHARED | VM_EXEC]				= PAGE_RX,
+	[VM_SHARED | VM_EXEC | VM_READ]			= PAGE_RX,
+	[VM_SHARED | VM_EXEC | VM_WRITE]		= PAGE_RWX,
+	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= PAGE_RWX
+};
+DECLARE_VM_GET_PAGE_PROT