linux-kernel - Re: [RFC PATCH v1 3/4] arm64: Detect FTRACE cases that make the stack trace unreliable

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Message-ID: <20210401142759.GJ4758@sirena.org.uk>
Date:   Thu, 1 Apr 2021 15:27:59 +0100
From:   Mark Brown <broonie@...nel.org>
To:     madvenka@...ux.microsoft.com
Cc:     mark.rutland@....com, jpoimboe@...hat.com, jthierry@...hat.com,
        catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 3/4] arm64: Detect FTRACE cases that make the
 stack trace unreliable

On Tue, Mar 30, 2021 at 02:09:54PM -0500, madvenka@...ux.microsoft.com wrote:

> +	 * FTRACE trampolines.
> +	 */
> +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
> +	{ (unsigned long) &ftrace_graph_call, 0 },
> +#ifdef CONFIG_FUNCTION_GRAPH_TRACER
> +	{ (unsigned long) ftrace_graph_caller, 0 },
> +	{ (unsigned long) return_to_handler, 0 },
> +#endif
> +#endif

It's weird that we take the address of ftrace_graph_call but not the
other functions - we should be consistent or explain why.  It'd probably
also look nicer to not nest the ifdefs, the dependencies in Kconfig will
ensure we only get things when we should.

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