linux-kernel - [PATCH V2 17/30] sh/mm: Enable ARCH_HAS_VM_GET_PAGE

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Message-Id: <1645425519-9034-18-git-send-email-anshuman.khandual@arm.com>
Date:   Mon, 21 Feb 2022 12:08:26 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-arch@...r.kernel.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org
Subject: [PATCH V2 17/30] sh/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. Subsequently all __SXXX and __PXXX
macros can be dropped which are no longer needed.

Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc: Rich Felker <dalias@...c.org>
Cc: linux-sh@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/sh/Kconfig               |  1 +
 arch/sh/include/asm/pgtable.h | 17 ----------------
 arch/sh/mm/mmap.c             | 38 +++++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 17 deletions(-)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 2474a04ceac4..f3fcd1c5e002 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -11,6 +11,7 @@ config SUPERH
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+	select ARCH_HAS_VM_GET_PAGE_PROT
 	select ARCH_HIBERNATION_POSSIBLE if MMU
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_WANT_IPC_PARSE_VERSION
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index d7ddb1ec86a0..6fb9ec54cf9b 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -89,23 +89,6 @@ static inline unsigned long phys_addr_mask(void)
  * completely separate permission bits for user and kernel space.
  */
 	 /*xwr*/
-#define __P000	PAGE_NONE
-#define __P001	PAGE_READONLY
-#define __P010	PAGE_COPY
-#define __P011	PAGE_COPY
-#define __P100	PAGE_EXECREAD
-#define __P101	PAGE_EXECREAD
-#define __P110	PAGE_COPY
-#define __P111	PAGE_COPY
-
-#define __S000	PAGE_NONE
-#define __S001	PAGE_READONLY
-#define __S010	PAGE_WRITEONLY
-#define __S011	PAGE_SHARED
-#define __S100	PAGE_EXECREAD
-#define __S101	PAGE_EXECREAD
-#define __S110	PAGE_RWX
-#define __S111	PAGE_RWX
 
 typedef pte_t *pte_addr_t;
 
diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
index 6a1a1297baae..cad14af6c8e6 100644
--- a/arch/sh/mm/mmap.c
+++ b/arch/sh/mm/mmap.c
@@ -162,3 +162,41 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
 {
 	return 1;
 }
+
+#ifdef CONFIG_MMU
+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:
+		return PAGE_READONLY;
+	case VM_WRITE:
+	case VM_WRITE | VM_READ:
+		return PAGE_COPY;
+	case VM_EXEC:
+	case VM_EXEC | VM_READ:
+		return PAGE_EXECREAD;
+	case VM_EXEC | VM_WRITE:
+	case VM_EXEC | VM_WRITE | VM_READ:
+		return PAGE_COPY;
+	case VM_SHARED:
+		return PAGE_NONE;
+	case VM_SHARED | VM_READ:
+		return PAGE_READONLY;
+	case VM_SHARED | VM_WRITE:
+		return PAGE_WRITEONLY;
+	case VM_SHARED | VM_WRITE | VM_READ:
+		return PAGE_SHARED;
+	case VM_SHARED | VM_EXEC:
+	case VM_SHARED | VM_EXEC | VM_READ:
+		return PAGE_EXECREAD;
+	case VM_SHARED | VM_EXEC | VM_WRITE:
+	case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+		return PAGE_RWX;
+	default:
+		BUILD_BUG();
+	}
+}
+EXPORT_SYMBOL(vm_get_page_prot);
+#endif
-- 
2.25.1