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

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Message-ID: <fe69ec57-4798-3fcc-4e41-3d36957ee5f6@linux.microsoft.com>
Date:   Thu, 1 Apr 2021 12:48:59 -0500
From:   "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>
To:     Mark Brown <broonie@...nel.org>
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 4/1/21 9:27 AM, Mark Brown wrote:
> 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.
> 

Sorry. I forgot to respond to the nested ifdef comment. I will fix that.

Thanks!

Madhavan