+ mm-mmap-drop-arch_filter_pgprot.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/mmap: drop arch_filter_pgprot()
has been added to the -mm tree.  Its filename is
     mm-mmap-drop-arch_filter_pgprot.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-mmap-drop-arch_filter_pgprot.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-mmap-drop-arch_filter_pgprot.patch

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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@arm.com>
Subject: mm/mmap: drop arch_filter_pgprot()

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

Link: https://lkml.kernel.org/r/20220414062125.609297-7-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/Kconfig~mm-mmap-drop-arch_filter_pgprot
+++ a/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
 
--- a/mm/mmap.c~mm-mmap-drop-arch_filter_pgprot
+++ a/mm/mmap.c
@@ -121,20 +121,11 @@ pgprot_t protection_map[16] __ro_after_i
 };
 
 #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)]) |
+	return __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);
 }
 EXPORT_SYMBOL(vm_get_page_prot);
 #endif	/* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */
_

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

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
mm-mmap-drop-arch_filter_pgprot.patch
mm-mmap-drop-arch_vm_get_page_pgprot.patch