[PATCH V3 27/30] nds32/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

Anshuman Khandual
2022-02-28T10:59:50Z

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: Nick Hu <nickhu@andestech.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/nds32/Kconfig | 1 +
arch/nds32/include/asm/pgtable.h | 17 ---------------
arch/nds32/mm/mmap.c | 37 ++++++++++++++++++++++++++++++++
3 files changed, 38 insertions(+), 17 deletions(-)

diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index 4d1421b18734..576e05479925 100644
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@@ -10,6 +10,7 @@ config NDS32
select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_WANT_FRAME_POINTERS if FTRACE
select CLKSRC_MMIO
select CLONE_BACKWARDS
diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
index 419f984eef70..79f64ed734cb 100644
--- a/arch/nds32/include/asm/pgtable.h
+++ b/arch/nds32/include/asm/pgtable.h
@@ -152,23 +152,6 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
#endif /* __ASSEMBLY__ */

/* xwr */
-#define __P000 (PAGE_NONE | _PAGE_CACHE_SHRD)
-#define __P001 (PAGE_READ | _PAGE_CACHE_SHRD)
-#define __P010 (PAGE_COPY | _PAGE_CACHE_SHRD)
-#define __P011 (PAGE_COPY | _PAGE_CACHE_SHRD)
-#define __P100 (PAGE_EXEC | _PAGE_CACHE_SHRD)
-#define __P101 (PAGE_READ | _PAGE_E | _PAGE_CACHE_SHRD)
-#define __P110 (PAGE_COPY | _PAGE_E | _PAGE_CACHE_SHRD)
-#define __P111 (PAGE_COPY | _PAGE_E | _PAGE_CACHE_SHRD)
-
-#define __S000 (PAGE_NONE | _PAGE_CACHE_SHRD)
-#define __S001 (PAGE_READ | _PAGE_CACHE_SHRD)
-#define __S010 (PAGE_RDWR | _PAGE_CACHE_SHRD)
-#define __S011 (PAGE_RDWR | _PAGE_CACHE_SHRD)
-#define __S100 (PAGE_EXEC | _PAGE_CACHE_SHRD)
-#define __S101 (PAGE_READ | _PAGE_E | _PAGE_CACHE_SHRD)
-#define __S110 (PAGE_RDWR | _PAGE_E | _PAGE_CACHE_SHRD)
-#define __S111 (PAGE_RDWR | _PAGE_E | _PAGE_CACHE_SHRD)

#ifndef __ASSEMBLY__
/*
diff --git a/arch/nds32/mm/mmap.c b/arch/nds32/mm/mmap.c
index 1bdf5e7d1b43..0399b928948d 100644
--- a/arch/nds32/mm/mmap.c
+++ b/arch/nds32/mm/mmap.c
@@ -71,3 +71,40 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
info.align_offset = pgoff << PAGE_SHIFT;
return vm_unmapped_area(&info);
}
+
+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 | _PAGE_CACHE_SHRD);
+ case VM_READ:
+ return (PAGE_READ | _PAGE_CACHE_SHRD);
+ case VM_WRITE:
+ case VM_WRITE | VM_READ:
+ return (PAGE_COPY | _PAGE_CACHE_SHRD);
+ case VM_EXEC:
+ return (PAGE_EXEC | _PAGE_CACHE_SHRD);
+ case VM_EXEC | VM_READ:
+ return (PAGE_READ | _PAGE_E | _PAGE_CACHE_SHRD);
+ case VM_EXEC | VM_WRITE:
+ case VM_EXEC | VM_WRITE | VM_READ:
+ return (PAGE_COPY | _PAGE_E | _PAGE_CACHE_SHRD);
+ case VM_SHARED:
+ return (PAGE_NONE | _PAGE_CACHE_SHRD);
+ case VM_SHARED | VM_READ:
+ return (PAGE_READ | _PAGE_CACHE_SHRD);
+ case VM_SHARED | VM_WRITE:
+ case VM_SHARED | VM_WRITE | VM_READ:
+ return (PAGE_RDWR | _PAGE_CACHE_SHRD);
+ case VM_SHARED | VM_EXEC:
+ return (PAGE_EXEC | _PAGE_CACHE_SHRD);
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return (PAGE_READ | _PAGE_E | _PAGE_CACHE_SHRD);
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+ return (PAGE_RDWR | _PAGE_E | _PAGE_CACHE_SHRD);
+ default:
+ BUILD_BUG();
+ }
+}
+EXPORT_SYMBOL(vm_get_page_prot);
--
2.25.1