linux-kernel - Re: [PATCH V2] arm64: add kc_offset_to_vaddr and kc_vaddr_to

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Message-Id: <6F07C7AF-779B-439D-B820-E11816664406@gmail.com>
Date:	Mon, 7 Sep 2015 23:03:35 +0900
From:	Jungseok Lee <jungseoklee85@...il.com>
To:	yalin wang <yalin.wang2010@...il.com>
Cc:	catalin.marinas@....com, will.deacon@....com, treding@...dia.com,
	zhangwm@...vell.com, mark.rutland@....com,
	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	ard.biesheuvel@...aro.org, fkan@....com, steve.capper@...aro.org,
	lauraa@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] arm64: add kc_offset_to_vaddr and kc_vaddr_to_offset macro

On Sep 6, 2015, at 1:04 PM, yalin wang wrote:

Hello Yalin,

> 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/memory.h  | 1 +
> arch/arm64/include/asm/pgtable.h | 2 ++
> 2 files changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
> index f800d45..2d09fe8 100644
> --- a/arch/arm64/include/asm/memory.h
> +++ b/arch/arm64/include/asm/memory.h
> @@ -55,6 +55,7 @@
> #define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)
> #define FIXADDR_TOP		(PCI_IO_START - SZ_2M)
> #define TASK_SIZE_64		(UL(1) << VA_BITS)
> +#define __VIRTUAL_MASK		((1UL << VA_BITS) - 1)

According to Catalin's comment, [1], it might need to be rewritten using VA_START
in the KASan patches, [2], after this merge window.

[1] https://lkml.org/lkml/2015/9/4/529
[2] git://github.com/aryabinin/linux.git kasan/arm64v5

Best Regards
Jungseok Lee--
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