linux-kernel - Re: [RFC PATCH v6 3/3] arm64: Create a list of SYM_CODE functions, check return PC against list

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Message-ID: <20210729162749.GA51855@sirena.org.uk>
Date:   Thu, 29 Jul 2021 17:27:49 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>,
        jpoimboe@...hat.com, ardb@...nel.org, nobuta.keiya@...itsu.com,
        sjitindarsingh@...il.com, catalin.marinas@....com, will@...nel.org,
        jmorris@...ei.org, pasha.tatashin@...een.com, jthierry@...hat.com,
        linux-arm-kernel@...ts.infradead.org,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v6 3/3] arm64: Create a list of SYM_CODE functions,
 check return PC against list

On Thu, Jul 29, 2021 at 04:48:04PM +0100, Mark Rutland wrote:

> For clarity, let's take your bullet-point list above as a list of
> examples, and make that:

> 	/*
> 	 * As SYM_CODE functions don't follow the usual calling
> 	 * conventions, we assume by default that any SYM_CODE function
> 	 * cannot be unwound reliably.
> 	 *
> 	 * Note that this includes:
> 	 *
> 	 * - Exception handlers and entry assembly
> 	 * - Trampoline assembly (e.g., ftrace, kprobes)
> 	 * - Hypervisor-related assembly
> 	 * - Hibernation-related assembly
> 	 * - CPU start-stop, suspend-resume assembly
> 	 * - Kernel relocation assembly
> 	 */

This looks good to me too.

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