linux-kernel - [PATCH 1/2] Unify devmem_is_allowed across architectures

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Date:	Sun, 16 Nov 2008 01:03:42 +0100
From:	Bernhard Walle <bwalle@...e.de>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Bernhard Walle <bwalle@...e.de>
Subject: [PATCH 1/2] Unify devmem_is_allowed across architectures

This patch unifies devmem_is_allowed() across different architectures.
It removes the devmem_is_allowed 1 defines from m32r and frv and
adds a generic fallback implementation to <asm-generic/page.h>.

Architecutes can define their version and define __HAVE_ARCH_RANGE_IS_ALLOWED.


Signed-off-by: Bernhard Walle <bwalle@...e.de>
---
 arch/x86/include/asm/page.h |    1 +
 include/asm-frv/page.h      |    2 --
 include/asm-generic/page.h  |    4 ++++
 include/asm-m32r/page.h     |    2 --
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/page.h b/arch/x86/include/asm/page.h
index e9873a2..b768401 100644
--- a/arch/x86/include/asm/page.h
+++ b/arch/x86/include/asm/page.h
@@ -63,6 +63,7 @@ extern void map_devmem(unsigned long pfn, unsigned long size,
 		       pgprot_t vma_prot);
 extern void unmap_devmem(unsigned long pfn, unsigned long size,
 			 pgprot_t vma_prot);
+#define __HAVE_ARCH_RANGE_IS_ALLOWED 1
 
 extern unsigned long max_low_pfn_mapped;
 extern unsigned long max_pfn_mapped;
diff --git a/include/asm-frv/page.h b/include/asm-frv/page.h
index bd9c220..bc2c835 100644
--- a/include/asm-frv/page.h
+++ b/include/asm-frv/page.h
@@ -40,8 +40,6 @@ typedef struct page *pgtable_t;
 #define __pgprot(x)	((pgprot_t) { (x) } )
 #define PTE_MASK	PAGE_MASK
 
-#define devmem_is_allowed(pfn)	1
-
 #define __pa(vaddr)		virt_to_phys((void *) (unsigned long) (vaddr))
 #define __va(paddr)		phys_to_virt((unsigned long) (paddr))
 
diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h
index 14db733..cde4ceb 100644
--- a/include/asm-generic/page.h
+++ b/include/asm-generic/page.h
@@ -19,6 +19,10 @@ static __inline__ __attribute_const__ int get_order(unsigned long size)
 	return order;
 }
 
+#ifndef __HAVE_ARCH_RANGE_IS_ALLOWED
+#define devmem_is_allowed(pfn)	1
+#endif
+
 #endif	/* __ASSEMBLY__ */
 
 #endif	/* _ASM_GENERIC_PAGE_H */
diff --git a/include/asm-m32r/page.h b/include/asm-m32r/page.h
index c933308..89d6b10 100644
--- a/include/asm-m32r/page.h
+++ b/include/asm-m32r/page.h
@@ -79,8 +79,6 @@ typedef struct page *pgtable_t;
 #define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
 				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )
 
-#define devmem_is_allowed(x) 1
-
 #include <asm-generic/memory_model.h>
 #include <asm-generic/page.h>
 
-- 
1.6.0.4

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