[PATCH V4 6/7] mm/mmap: Drop arch_filter_pgprot()

[Anshuman Khandual]

There are no platforms left which subscribe ARCH_HAS_FILTER_PGPROT. Hence
drop generic arch_filter_pgprot() and also config ARCH_HAS_FILTER_PGPROT.

Cc: Andrew Morton <a...@linux-foundation.org>
Cc: linux...@kvack.org
Cc: linux-ker...@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khand...@arm.com>
---
 mm/Kconfig | 3 ---
 mm/mmap.c  | 9 +--------
 2 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index b1f7624276f8..3f7b6d7b69df 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -762,9 +762,6 @@ config ARCH_HAS_CURRENT_STACK_POINTER
          register alias named "current_stack_pointer", this config can be
          selected.
 
-config ARCH_HAS_FILTER_PGPROT
-       bool
-
 config ARCH_HAS_VM_GET_PAGE_PROT
        bool
 
diff --git a/mm/mmap.c b/mm/mmap.c
index 87cb2eaf7e1a..edf2a5e38f4d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -107,20 +107,13 @@ pgprot_t protection_map[16] __ro_after_init = {
 };
 
 #ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT
-#ifndef CONFIG_ARCH_HAS_FILTER_PGPROT
-static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
-{
-       return prot;
-}
-#endif
-
 pgprot_t vm_get_page_prot(unsigned long vm_flags)
 {
        pgprot_t ret = __pgprot(pgprot_val(protection_map[vm_flags &
                                (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) |
                        pgprot_val(arch_vm_get_page_prot(vm_flags)));
 
-       return arch_filter_pgprot(ret);
+       return ret;
 }
 EXPORT_SYMBOL(vm_get_page_prot);
 #endif /* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */
-- 
2.25.1