linux-kernel - [RFC] arm64: add kc_offset_to_vaddr and kc_vaddr_to

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Message-Id: <1444632779-23369-1-git-send-email-yalin.wang2010@gmail.com>
Date:	Mon, 12 Oct 2015 14:52:59 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	catalin.marinas@....com, will.deacon@....com,
	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	yalin wang <yalin.wang2010@...il.com>
Subject: [RFC] arm64: add kc_offset_to_vaddr and kc_vaddr_to_offset macro

This patch add kc_offset_to_vaddr() and kc_vaddr_to_offset(),
the default version doesn't work on arm64, because arm64 kernel address
is below the PAGE_OFFSET, like module address and vmemmap address are
all below PAGE_OFFSET address.

Signed-off-by: yalin wang <yalin.wang2010@...il.com>
---
 arch/arm64/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 4331d84..23070a8 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -658,6 +658,8 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
 
 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
 
+#define	kc_vaddr_to_offset(v) ((v) & ~VA_START)
+#define	kc_offset_to_vaddr(o) ((o) | VA_START)
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_PGTABLE_H */
-- 
1.9.1

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