2015-08-30 06:20:15

by yalin wang

Subject: [PATCH] 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 <[email protected]>
---
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 d374191..ef1ed5c 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -660,6 +660,8 @@ 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) & ((1UL << VA_BITS) - 1))
+#define kc_offset_to_vaddr(o) ((o) | ~((1UL << VA_BITS) - 1))
#endif /* !__ASSEMBLY__ */

#endif /* __ASM_PGTABLE_H */
--
1.9.1

2015-09-01 02:00:18

by yalin wang

Subject: Re: [PATCH] arm64: add kc_offset_to_vaddr and kc_vaddr_to_offset macro

Ping ?
> On Aug 30, 2015, at 14:19, yalin wang <[email protected]> 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 <[email protected]>
> ---
> 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 d374191..ef1ed5c 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -660,6 +660,8 @@ 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) & ((1UL << VA_BITS) - 1))
> +#define kc_offset_to_vaddr(o) ((o) | ~((1UL << VA_BITS) - 1))
> #endif /* !__ASSEMBLY__ */
>
> #endif /* __ASM_PGTABLE_H */
> --
> 1.9.1
>