linux-kernel - Re: [PATCHv4 10/10] arm64: Add support for CONFIG_DEBUG

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Date:   Tue, 6 Dec 2016 18:58:24 +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: [PATCHv4 10/10] arm64: Add support for CONFIG_DEBUG_VIRTUAL

On Tue, Nov 29, 2016 at 10:55:29AM -0800, Laura Abbott wrote:
> 
> +	WARN(!__is_lm_address(x),
> +	     "virt_to_phys used for non-linear address :%pK\n", (void *)x);

Nit: s/ :/: /

It might be worth adding %pS too; i.e.

	WARN(!__is_lm_address(x),
	     "virt_to_phys used for non-linear address: %pK (%pS)\n",
	     (void *)x, (void *)x);

... that way we might get a better idea before we have to resort to
grepping objdump output.

Other than that this looks good to me. This builds cleanly with and
without DEBUG_VIRTUAL enabled, and boots happily with DEBUG_VIRTUAL
disabled.

With both DEBUG_VIRTUAL and KASAN, I'm hitting a sea of warnings from
kasan_init at boot time, but I don't think that's a problem with this
patch as such, so FWIW:

Reviewed-by: Mark Rutland <mark.rutland@....com>
Tested-by: Mark Rutland <mark.rutland@....com>

Thanks,
Mark.