[PATCH V3 27/30] nds32/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
From: Anshuman Khandual <hidden>
Date: 2022-02-28 10:55:10
Also in:
linux-alpha, linux-arch, linux-arm-kernel, linux-m68k, linux-mips, linux-mm, linux-riscv, linux-s390, linux-sh, linux-um, lkml, sparclinux
Subsystem:
the rest · Maintainer:
Linus Torvalds
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 <redacted> Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <redacted> --- 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);
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2.25.1