linux-kernel - Re: [PATCH] arm64: add kc_offset_to_vaddr and kc_vaddr_to

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Message-Id: <385BEB9B-288F-4898-8728-CC4948DF0907@gmail.com>
Date:	Tue, 1 Sep 2015 10:00:04 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	ard.biesheuvel@...aro.org, Minchan Kim <minchan@...nel.org>,
	fkan@....com, steve.capper@...aro.org, lauraa@...eaurora.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
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 <yalin.wang2010@...il.com> 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@...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 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
> 

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