linux-kernel - Re: [PATCH v3] arm64: Synchronise dump

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Message-ID: <20151019180214.GH11226@e104818-lin.cambridge.arm.com>
Date:	Mon, 19 Oct 2015 19:02:15 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Jungseok Lee <jungseoklee85@...il.com>
Cc:	will.deacon@....com, linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	James Morse <james.morse@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] arm64: Synchronise dump_backtrace() with perf
 callchain

On Sat, Oct 17, 2015 at 02:28:11PM +0000, Jungseok Lee wrote:
> Note that this patch does not cover a case where MMU is disabled. The
> last stack frame of swapper, for example, has PC in a form of physical
> address. Unfortunately, a simple conversion using phys_to_virt() cannot
> cover all scenarios since PC is retrieved from LR - 4, not LR. It is
> a big tradeoff to change both head.S and unwind_frame() for only a few
> of symbols in *.S. Thus, this hunk does not take care of the case.

That's fine, I think we can cope with a physical address as the last
entry in the trace.

Patch queued for 4.4. Thanks.

-- 
Catalin
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