linux-kernel - Re: [PATCHv3 6/6] arm64: Add support for CONFIG_DEBUG

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Date:   Fri, 18 Nov 2016 18:25:24 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv3 6/6] arm64: Add support for CONFIG_DEBUG_VIRTUAL

On Thu, Nov 17, 2016 at 05:16:56PM -0800, Laura Abbott wrote:
> diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile
> index 54bb209..0d37c19 100644
> --- a/arch/arm64/mm/Makefile
> +++ b/arch/arm64/mm/Makefile
> @@ -5,6 +5,7 @@ obj-y				:= dma-mapping.o extable.o fault.o init.o \
>  obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
>  obj-$(CONFIG_ARM64_PTDUMP)	+= dump.o
>  obj-$(CONFIG_NUMA)		+= numa.o
> +obj-$(CONFIG_DEBUG_VIRTUAL)	+= physaddr.o

We'll also need:

KASAN_SANITIZE_physaddr.o	:= n

... or code prior to KASAN init will cause the kernel to die if
__virt_to_phys() or __phys_addr_symbol() are called.

>  obj-$(CONFIG_KASAN)		+= kasan_init.o
>  KASAN_SANITIZE_kasan_init.o	:= n

Thanks,
Mark,