Re: [PATCH V4 4/7] sparc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

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On 4/7/22 04:32, Anshuman Khandual wrote:
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().

Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
Cc: sparclinux@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
  arch/sparc/Kconfig            |  1 +
  arch/sparc/include/asm/mman.h |  6 ------
  arch/sparc/mm/init_64.c       | 13 +++++++++++++
  3 files changed, 14 insertions(+), 6 deletions(-)


Reviewed-by: Khalid Aziz <khalid.aziz@xxxxxxxxxx>


diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 9200bc04701c..85b573643af6 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -84,6 +84,7 @@ config SPARC64
  	select PERF_USE_VMALLOC
  	select ARCH_HAVE_NMI_SAFE_CMPXCHG
  	select HAVE_C_RECORDMCOUNT
+	select ARCH_HAS_VM_GET_PAGE_PROT
  	select HAVE_ARCH_AUDITSYSCALL
  	select ARCH_SUPPORTS_ATOMIC_RMW
  	select ARCH_SUPPORTS_DEBUG_PAGEALLOC
diff --git a/arch/sparc/include/asm/mman.h b/arch/sparc/include/asm/mman.h
index 274217e7ed70..af9c10c83dc5 100644
--- a/arch/sparc/include/asm/mman.h
+++ b/arch/sparc/include/asm/mman.h
@@ -46,12 +46,6 @@ static inline unsigned long sparc_calc_vm_prot_bits(unsigned long prot)
  	}
  }
-#define arch_vm_get_page_prot(vm_flags) sparc_vm_get_page_prot(vm_flags)
-static inline pgprot_t sparc_vm_get_page_prot(unsigned long vm_flags)
-{
-	return (vm_flags & VM_SPARC_ADI) ? __pgprot(_PAGE_MCD_4V) : __pgprot(0);
-}
-
  #define arch_validate_prot(prot, addr) sparc_validate_prot(prot, addr)
  static inline int sparc_validate_prot(unsigned long prot, unsigned long addr)
  {
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 8b1911591581..dcb17763c1f2 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -3184,3 +3184,16 @@ void copy_highpage(struct page *to, struct page *from)
  	}
  }
  EXPORT_SYMBOL(copy_highpage);
+
+static pgprot_t sparc_vm_get_page_prot(unsigned long vm_flags)
+{
+	return (vm_flags & VM_SPARC_ADI) ? __pgprot(_PAGE_MCD_4V) : __pgprot(0);
+}
+
+pgprot_t vm_get_page_prot(unsigned long vm_flags)
+{
+	return __pgprot(pgprot_val(protection_map[vm_flags &
+			(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) |
+			pgprot_val(sparc_vm_get_page_prot(vm_flags)));
+}
+EXPORT_SYMBOL(vm_get_page_prot);





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