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[v2,6/9] arm64: mm: restrict virt_to_page() to the linear mapping

Message ID 1459349164-27175-7-git-send-email-ard.biesheuvel@linaro.org
State Accepted
Commit 9f2875912dac35d9272a82ea9eec9e5884b42cd2
Headers show

Commit Message

Ard Biesheuvel March 30, 2016, 2:46 p.m. UTC 
Now that the vmemmap region has been redefined to cover the linear region
rather than the entire physical address space, we no longer need to
perform a virtual-to-physical translation in the implementaion of
virt_to_page(). This restricts virt_to_page() translations to the linear
region, so redefine virt_addr_valid() as well.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 arch/arm64/include/asm/memory.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

-- 
2.5.0


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Patch

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 8a2ab195ca77..f412f502ccdd 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -208,9 +208,19 @@  static inline void *phys_to_virt(phys_addr_t x)
  */
 #define ARCH_PFN_OFFSET		((unsigned long)PHYS_PFN_OFFSET)
 
+#ifndef CONFIG_SPARSEMEM_VMEMMAP
 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
-#define	virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+#else
+#define __virt_to_pgoff(kaddr)	(((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
+#define __page_to_voff(kaddr)	(((u64)(page) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
+
+#define page_to_virt(page)	((void *)((__page_to_voff(page)) | PAGE_OFFSET))
+#define virt_to_page(vaddr)	((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
 
+#define virt_addr_valid(kaddr)	pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
+					   + PHYS_OFFSET) >> PAGE_SHIFT)
+#endif
 #endif
 
 #include <asm-generic/memory_model.h>