From 91d4ce985fbb22c9a8ae50601f1ad4fe953b9382 Mon Sep 17 00:00:00 2001
From: Anshuman Khandual <anshuman.khandual@arm.com>
Date: Thu, 28 Apr 2022 23:16:13 -0700
Subject: sparc/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.  It localizes
arch_vm_get_page_prot() as sparc_vm_get_page_prot() and moves near
vm_get_page_prot().

Link: https://lkml.kernel.org/r/20220414062125.609297-5-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ingo Molnar <mingo@redhat.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>
---
 arch/sparc/mm/init_64.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'arch/sparc/mm')

diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 8b1911591581..f6174df2d5af 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -3184,3 +3184,15 @@ void copy_highpage(struct page *to, struct page *from)
 	}
 }
 EXPORT_SYMBOL(copy_highpage);
+
+pgprot_t vm_get_page_prot(unsigned long vm_flags)
+{
+	unsigned long prot = pgprot_val(protection_map[vm_flags &
+					(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]);
+
+	if (vm_flags & VM_SPARC_ADI)
+		prot |= _PAGE_MCD_4V;
+
+	return __pgprot(prot);
+}
+EXPORT_SYMBOL(vm_get_page_prot);
-- 
cgit