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SubjectRE: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
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> -----Original Message-----
> From: Linuxppc-dev [mailto:linuxppc-dev-
> bounces+bharat.bhushan=freescale.com@lists.ozlabs.org] On Behalf Of Tiejun Chen
> Sent: Tuesday, July 09, 2013 1:33 PM
> To: benh@kernel.crashing.org
> Cc: linuxppc-dev@lists.ozlabs.org; linux-kernel@vger.kernel.org
> Subject: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
>
> Book3e is always aligned 1GB to create TLB so we should
> use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to
> get __pa/__va properly while boot kdump.
>
> Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
> ---
> arch/powerpc/include/asm/page.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
> index 988c812..5b00081 100644
> --- a/arch/powerpc/include/asm/page.h
> +++ b/arch/powerpc/include/asm/page.h
> @@ -112,6 +112,8 @@ extern long long virt_phys_offset;
> /* See Description below for VIRT_PHYS_OFFSET */
> #ifdef CONFIG_RELOCATABLE_PPC32
> #define VIRT_PHYS_OFFSET virt_phys_offset
> +#elif defined(CONFIG_PPC_BOOK3E_64)
> +#define VIRT_PHYS_OFFSET (KERNELBASE - MEMORY_START)

Can you please explain this code a bit more. I am not understanding this part:)

-Bharat

> #else
> #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START)
> #endif
> --
> 1.7.9.5
>
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> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev




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