* [RFC] arm64: add kc_offset_to_vaddr and kc_vaddr_to_offset macro
@ 2015-10-12 6:52 yalin wang
2015-10-13 14:19 ` Catalin Marinas
0 siblings, 1 reply; 2+ messages in thread
From: yalin wang @ 2015-10-12 6:52 UTC (permalink / raw)
To: catalin.marinas, will.deacon, akpm, kirill.shutemov,
linux-arm-kernel, linux-kernel
Cc: yalin wang
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@gmail.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
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [RFC] arm64: add kc_offset_to_vaddr and kc_vaddr_to_offset macro
2015-10-12 6:52 [RFC] arm64: add kc_offset_to_vaddr and kc_vaddr_to_offset macro yalin wang
@ 2015-10-13 14:19 ` Catalin Marinas
0 siblings, 0 replies; 2+ messages in thread
From: Catalin Marinas @ 2015-10-13 14:19 UTC (permalink / raw)
To: yalin wang
Cc: will.deacon, akpm, kirill.shutemov, linux-arm-kernel, linux-kernel
On Mon, Oct 12, 2015 at 02:52:59PM +0800, yalin wang wrote:
> 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@gmail.com>
Applied. Thanks.
--
Catalin
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-10-12 6:52 [RFC] arm64: add kc_offset_to_vaddr and kc_vaddr_to_offset macro yalin wang
2015-10-13 14:19 ` Catalin Marinas
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